CN111517716A - Preparation method and application of regenerated water-permeable concrete pavement brick or slab - Google Patents

Preparation method and application of regenerated water-permeable concrete pavement brick or slab Download PDF

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Publication number
CN111517716A
CN111517716A CN202010324142.9A CN202010324142A CN111517716A CN 111517716 A CN111517716 A CN 111517716A CN 202010324142 A CN202010324142 A CN 202010324142A CN 111517716 A CN111517716 A CN 111517716A
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Prior art keywords
regenerated
recycled
water
waste
determining
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Inventor
吕杉
龙云
王亚彬
龙凤全
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Sichuan Gongyuming Graphic Design Co ltd
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Sichuan Gongyuming Graphic Design Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C11/00—Details of pavings
    • E01C11/22—Gutters; Kerbs ; Surface drainage of streets, roads or like traffic areas
    • E01C11/224—Surface drainage of streets
    • E01C11/225—Paving specially adapted for through-the-surfacing drainage, e.g. perforated, porous; Preformed paving elements comprising, or adapted to form, passageways for carrying off drainage
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C5/00—Pavings made of prefabricated single units
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C5/00—Pavings made of prefabricated single units
    • E01C5/003—Pavings made of prefabricated single units characterised by material or composition used for beds or joints; characterised by the way of laying
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C5/00—Pavings made of prefabricated single units
    • E01C5/06—Pavings made of prefabricated single units made of units with cement or like binders
    • G—PHYSICS
    • G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
    • G16C—COMPUTATIONAL CHEMISTRY; CHEMOINFORMATICS; COMPUTATIONAL MATERIALS SCIENCE
    • G16C60/00—Computational materials science, i.e. ICT specially adapted for investigating the physical or chemical properties of materials or phenomena associated with their design, synthesis, processing, characterisation or utilisation
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
    • C04B2111/00284—Materials permeable to liquids

Abstract

The invention discloses a preparation method of a regenerated water-permeable concrete pavement brick or slab, which comprises the following steps: s1 classifying, recovering and preparing regeneration raw materials; s2, determining the preparation strength and the water-to-glue ratio; s3, preparing regenerated pervious concrete slurry; s4, determining a reference mixing ratio; s5, determining the production mixing ratio; the invention also provides an application of the preparation method of the regenerated water-permeable concrete pavement brick or slab, which comprises the following steps: s1, determining the usage amount of the raw materials; s2 preparing the rough regenerated pervious concrete by a two-step stirring method; s3, preparing a finished product of the regenerated water permeable brick or board; the invention has the beneficial effects that: determining the preparation strength, the water gel, the use amount of each raw material, the density and the gas content of the regenerated pervious concrete slurry, the reference mixing ratio and the production mixing ratio by utilizing each waste, providing data for the easy compatibility of each waste and simultaneously reducing the preparation cost; the two-time stirring method is utilized, so that the regeneration raw materials prepared from the wastes can be fully compatible.

Description

Preparation method and application of regenerated water-permeable concrete pavement brick or slab
Technical Field
The invention relates to the field of green environment-friendly building materials, in particular to a preparation method and application of a regenerated water-permeable concrete pavement brick or slab.
Background
Along with the development of industry, business, construction and agriculture in China, huge amount of garbage or waste is generated, and the environment is seriously influenced. In the aspect of agriculture, the straw resources cannot be effectively utilized for a long time, and are often used as livestock feed to be returned to the field or burnt, but as the livestock feed, livestock has strong selectivity to straws, and the straws of rape, such as the straws, have high toughness and cannot be used as animal feed, and the burning causes pollution to the environment, the treatment difficulty is high, in the aspects of industry, commerce and construction, the generated solid wastes, particularly building wastes, are concentrated and stacked in various places, so that the occupied area is large, and the environment is seriously polluted;
meanwhile, on urban landscapes and urban planning, a closed terrace is used in a large area, wherein the adopted closed material is easy to harden in a large area, then an atmospheric rainwater circulating system flushes the hardened terrace, so that atmospheric rainwater with dust in the air passes through the town impervious terrace and enters a town official network to be discharged into a canal after being continuously polluted, natural water resources are increasingly poor in quality, polluted water is evaporated into the air, and the vicious circle of the polluted air is continuously carried out; and underground water cannot be evaporated from soil to reduce the environmental temperature of the ground in hot days, and water cannot circulate up and down to form a dead terrace. When the permeable terrace is adopted, polluted particles or dust in the atmosphere permeate into natural soil along with rainwater, the polluted particles or dust become clear water after being filtered and adsorbed by the natural soil and permeate into a canal, the river water pollution is greatly reduced, after the river water becomes clear, water vapor evaporates into the air to form air which is increasingly clear, under the hot weather, water stored in the soil below the ground at ordinary times is evaporated out through the permeable bricks to reduce the ground temperature, and meanwhile, the natural ecological cycle with good water content is recovered to form the environment-friendly terrace.
Thus synthesizing a permeable terrace andin the aspect of domestic waste recovery, regenerated pervious concrete is produced by transportation, wherein the regenerated pervious concrete is a pervious concrete mixture prepared by adopting regenerated aggregate, regenerated light material, regenerated powder and cementing material through a hydration process, and the compressive strength range C of the regenerated pervious concrete10～C30The method is detected according to GB/T50081-2019 regulations, simultaneously, related performance indexes of the pervious concrete aggregate are widened according to CJJ/T253-2016 (recycled aggregate pervious concrete application technical regulation) 4.1.2 of the national industry standard, and the limitation is caused by the use of 3.0.2 main items (recycled aggregate application technical regulation) JGJ/T240-2011 for preparing concrete, mortar and building blocks or bricks by aiming at the recycled aggregate, for example, the preparation and use of domestic pervious concrete mainly aim at CJJ/T253-2016 (recycled aggregate pervious concrete application technical regulation) requirements, the recycled aggregate is only limited to concrete and stones, no less than secondary fly ash is adopted for powder, no less than S95 grade slag, silica fume and the like are adopted for preparing the pervious concrete, so that a large amount of buildings are caused, agricultural and industrial wastes and the like cannot be recycled in large quantities, and the main reasons are caused by the types and the complex agricultural and industrial wastes, the compatibility between the materials such as recycled light materials generated by recycling agricultural wastes, recycled powder materials recycled by industrial wastes, aggregate, cement and the like is poor, the types and the component conditions of regional wastes are different, the physical, chemical and mechanical properties of the wastes are different greatly, the compatibility of the wastes in mutual mixing use is poor, the reasonable determination of the use amount of the raw materials or the selection of the mixing amount has great technical problems, and particularly the specific performance of the recycled aggregate and the sandstone aggregate is extremely unstable: a large amount of microcracks are generated in the crushing process, so that the porosity is high, the water absorption is high, the crushing index is high and the like, and the physical and mechanical properties of the concrete are obviously reduced or are extremely difficult to control; therefore, a preparation method and application of the regenerated water-permeable concrete pavement bricks or slabs are urgently needed at present to solve the problem of compatibility among various wastes and provide corresponding proportion.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a preparation method and application of a regenerated water-permeable concrete pavement brick or slab, so as to at least achieve the purposes of enabling various wastes to be compatible and reducing the preparation cost.
The purpose of the invention is realized by the following technical scheme:
a preparation method of a regenerated water-permeable concrete pavement brick or slab comprises the following steps:
s1, crushing the solid wastes, classifying and recycling the solid wastes, and distinguishing the solid wastes according to the recycled powder, the recycled light material and the recycled aggregate to obtain recycled raw materials;
s2, determining the preparation strength of the regenerated pervious concrete and the water-cement ratio of the regenerated pervious concrete according to the characteristics of the prepared standard pavement brick or pavement slab of the regenerated raw materials and the raw material formulas of water, cement, regenerated powder, regenerated light material, regenerated aggregate, admixture, auxiliary materials and compensation materials;
s3, determining the use amount of each raw material for forming the regenerated pervious concrete slurry, and mixing the slurry by taking the preparation strength and the water-to-glue ratio as standards to obtain the regenerated pervious concrete slurry;
s4, measuring the density and the gas content of the regenerated pervious concrete slurry, determining the use amount of the regenerated raw materials by using the density and the gas content, and determining the reference mixing proportion of the regenerated pervious concrete;
s5, on the basis of determining the regenerated pervious concrete, determining the production mix proportion of the regenerated pervious concrete according to the actual detection index.
Preferably, in order to further realize the sufficient recovery of solid wastes, the classified recovery is to prepare building solid inorganic wastes and/or industrial solid inorganic wastes into regenerated powder with the particle size of less than 0.15mm by using ready-made mature drying and grinding equipment, wherein the building solid inorganic wastes are selected from one or more of waste bricks, waste battens, waste tiles, waste concrete blocks, waste mortar and sandstone wastes, and the industrial solid inorganic wastes are selected from one or more of drilling wastes, metallurgical wastes, mining wastes, fuel wastes and chemical wastes; preparing a recycled light material with the particle size of not more than 2.5mm by using one or more of commercial garbage, agricultural garbage and forestry garbage, wherein the commercial garbage is one or more of polyester boards, waste perlite products, waste straw products, waste ceramsite products and disposable lunch boxes, the agricultural garbage is one or more of straws, rapeseed straws, corn cobs and shells, and the forestry garbage is one or more of roots, stems, leaves and shells of forestry plants; the method comprises the following steps of preparing a single-particle-grade recycled aggregate with a drying and grinding device which is mature and prepared by building solid inorganic garbage and/or industrial solid inorganic garbage, wherein the building solid inorganic garbage is one or more of waste bricks, waste ribbon boards, waste ceramic tiles, waste concrete blocks, waste mortar and sandstone waste, and the industrial solid inorganic garbage is one or more of drilling particles, metallurgical waste residues, mining waste stones and chemical waste solid particles; the particle size and the source are taken as reference objects, and the selection range of the solid waste is expanded beyond the specified standard, so that the source of the raw materials is increased, and the integral life significance is increased.
Preferably, in order to further determine a specific numerical value of the preparation strength of the pervious concrete and further reduce the preparation cost, the determining the preparation strength of the recycled pervious concrete comprises the following steps:
(1) determining the continuous porosity p% of the regenerated water-permeable concrete brick or plate, taking 10-20%;
(2) detecting the strength activity index f% of the regenerated powder by using the method 3.6 in the GB/T1596-2017 standard;
(3) detecting a crushing value index s% of the recycled aggregate according to the method 6.12 in JGJ 52-2006;
(4) determining the design strength f of the regenerated pervious concreteckAnd intensity standard deviation σ: the permeable concrete has the strength grade of C15，C20，C25，C30According to the strength grade of the corresponding permeable concrete brick or board, C15Sigma of 3MPa, C20And the following sigma is 4MPa, C30And the following sigma is 5 MPa;
(5) determining the preparation strength R of the regenerated pervious concrete rotary or platej：
Rj＝[fck*(1+s％)+1.645*σ*(2.3-f％)](1+ p%); the preparation strength ratio is reversely deduced by using a numerical value specified by a standard, so that the precise algorithm proportion of the proportion is provided, the condition of excess materials is avoided, and the preparation cost is reduced.
Preferably, in order to further realize the mixing compatibility of the recycled aggregate, the recycled powder and the recycled light material prepared from the solid waste, the water-cement ratio of the recycled pervious concrete is determined by JGJ55-2011 item 5.1 and the formula:
Figure BDA0002462548910000031
fb＝yf*ys*fce，
fce＝fc*g，
wherein W is the water-gel ratio, W is less than or equal to 0.4, and when W exceeds 0.4, the W is 0.4; alphaaAnd alphabIs an aggregate regression coefficient, alphaa＝0.53，ɑb＝0.2；RjPreparing strength for the regenerated pervious concrete; f. ofbThe compressive strength of the gelled material is 28 days; f. ofceThe cement mortar has 28 days mortar compressive strength; y iscIs the coefficient of richness of the cement; y isfThe influence coefficient of the regenerated powder; y issThe influence coefficient of the mineral powder is ys 1; g is the cement strength grade value; the water-gel ratio is calculated by utilizing the determined numerical value, so that the regenerated powder can be fully gelled and mixed with other raw materials of the regenerated pervious concrete, the subsequent compatibility of various wastes is paved, and meanwhile, the condition of process excess materials can be reduced by the determined formula numerical value, and the preparation cost is reduced.
Preferably, in order to further realize the whole dosage of the raw materials, the dosage of each raw material for determining and composing the regenerated pervious concrete slurry comprises the following steps:
(1) calculating the minimum trial mixing amount: minimum trial mixing quantity Q is volume V according to the required quantity of detection containerr*1.5*2000；
(2) Determining the initial quantitative amount of each raw material of the slurry: calculated by the following formula:
the total water consumption:
Figure BDA0002462548910000032
total gel dosage:
Figure BDA0002462548910000041
the dosage of the additive is as follows: wy＝Jz*Wc
Water content of the additive: wh＝Wy*(1-Wg)；
The amount of the regenerated powder is as follows: fy＝Jz*Fc；
The cement dosage is as follows: sy＝Jz-Fy；
The water consumption of cement: w ═ Wz-Wh；
The dosage of the special auxiliary materials for the recycled lightweight concrete is as follows: sn＝Jz*Sc，
In the formula, SjIs a water-to-glue ratio, WcIs the mixing amount of the additive, WgIs the fixed amount of the additive, Fc is the mixing amount of the regeneration powder, ScThe amount of the special auxiliary material for the regenerated lightweight concrete is the blending amount; on the basis of the trial mixing quantity Q, the total water consumption, the total gelling consumption, the additive water content, the regenerated powder consumption, the cement water consumption and the consumption of special auxiliary materials for the regenerated light concrete are calculated by using standard test values, and the risk of excess materials in the process is reduced by determining the consumption of the regenerated pervious concrete, so that the preparation cost is reduced.
Preferably, in order to further accurately use the amount of each raw material, the determining of the reference mixing ratio of the recycled water-permeable concrete comprises the following steps:
(1) detecting the recycled aggregate according to a JGJ52-2006 screening test;
(2) setting the aggregate left by screening to be equivalent to a cube with the average grain diameter as the side length according to screening test data;
(3) calculating the average grain diameter of the recycled aggregate in each grid: the average particle size of each grid of sieve is (the side length of the square mesh of the screen in the grid plus the side length of the square mesh of the screen in the previous grid)/2;
(4) calculating the overall average particle size of the recycled aggregate:
1) the average volume of each screen of single particles is equal to the cube of the average particle size of each screen;
2) the mass of each grid of the single particles is equal to the average volume of each grid of the single particles and the apparent density of the recycled aggregate/1000000;
3) the number of the particles of the recycled aggregate which is sieved out of each grid is equal to the corresponding sieving residual value of each grid/the mass of a single particle which is sieved out of each grid;
4) the total average particle size of the recycled aggregate is the sum of the average particle size of each grid sieve and the number of the recycled aggregate particles per grid sieve and/or the cumulative sum of the number of the recycled aggregate particles per grid sieve;
(5) determining the use amount of the recycled aggregate:
1) regenerated aggregate cube volume (regenerated aggregate overall average particle size)3
2) Determining the net distance of the recycled aggregate by an equal pressure method: the net distance of the recycled aggregate (total average particle size of the recycled aggregate) is the preparation strength of the recycled pervious concrete/the compressive strength of the cement for 28 days/3.8284;
3) determination of void fraction of recycled aggregate
Figure BDA0002462548910000051
4) Single volume of recycled aggregate (1-theoretical porosity of recycled aggregate) by (1-porosity of product);
5) the single amount of the recycled aggregate is equal to the volume of the single amount of the recycled aggregate and the apparent density of the recycled aggregate;
(6) determining the volume and the dosage of the regenerated light material:
1) determining the volume of the regenerated light material:
air content of the slurry (1-simple volume of recycled aggregate-porosity of the product);
single volume Vq of recycled light material (1-single volume of recycled aggregate-porosity of product-gas containing volume) Qt；
Qt is the volume doping value of the regenerated light material accounting for the slurry, and is 2-5%.
2) Determining the use amount of the regenerated light material:
qv Vq apparent density of regenerated light material
(7) Determining the single formula volume of the net slurry body and the dosage of the single formula net slurry body:
the single volume of the clean slurry body is 1, the single volume of the recycled aggregate, the porosity of the product, the gas containing volume and the single volume of the recycled light material;
the amount of the net slurry is the density of the net slurry and the single volume of the net slurry;
(8) determining the initial quantitative amount of each raw material:
the total water consumption:
Figure BDA0002462548910000052
total gel dosage:
Figure BDA0002462548910000053
the dosage of the additive is as follows: wy＝Jz*Wc
Water content of the additive: wh＝Wy*(1-Wg)；
The amount of the regenerated powder is as follows: fy＝Jz*Fc；
The cement dosage is as follows: sy＝Jz-Fy；
The water consumption of cement: w ═ Wz-Wh；
The dosage of the special auxiliary materials for the recycled lightweight concrete is as follows: sn＝Jz*Sc，
In the formula, Q is the determined dosage of the pure slurry; sj to itWater-to-glue ratio; wcIs the admixture mixing amount; wgIs the solid content of the additive; fcThe mixing amount of the regeneration powder; scThe value is 0.2-0.5% of the mixing amount of the building glue powder;
(9) synthesizing the dosage and the proportion of each raw material, namely the reference mix proportion of the regenerated pervious concrete; the single-side volumes of the recycled aggregate and the recycled light material are utilized to reversely deduce the usage amount of each raw material, so that the determination of the initial fixed usage amount of the whole raw material is realized, the traditional weight calculation is distinguished, the actual preparation volume and the corresponding volume usage amount are more met, and the purpose of reducing the preparation cost is realized.
Preferably, in order to further estimate the production mix ratio according to the reference mix ratio, the determining the production mix ratio of the recycled water-permeable concrete comprises the following steps:
(1) actually measuring the water content, the powder content and the water absorption of the recycled aggregate and the recycled light material;
(2) on the basis of the reference mixing ratio, the use amount of the raw materials is increased according to the water content and the powder content, and the water consumption during production is determined as follows:
the production water consumption is the water consumption of the reference mixing ratio, the recycled aggregate amount of the reference mixing ratio, the water content of the recycled aggregate, the recycled light material amount of the reference mixing ratio, the water content of the recycled light material, the recycled aggregate water absorption rate is 0.96, the recycled light material amount is 0.32,
in the formula, 0.96 and 0.32 are detection error adjustment coefficients of the water absorption of the recycled aggregate and the recycled light material, and the water absorption is the water absorption value of the solid material of the recycled aggregate or the recycled light material;
(3) on the basis of the use amount of the reference mixing proportion, combining the production water consumption to obtain the production mixing proportion of the regenerated pervious concrete; the water absorption values of the recycled aggregate and the recycled light material are determined by detecting the error adjustment coefficient through the actually measured water content, powder content and water absorption of the recycled aggregate and the recycled light material, so that the accurate calculation of the actual production water consumption is realized, the condition that the slurry is viscous or loose due to too low or too high water amount in the preparation stage is reduced, and the preparation cost is saved.
The invention also provides an application of the preparation method of the regenerated water-permeable concrete pavement brick or slab, which comprises the following steps:
s1, detecting the indexes of the raw materials of the regenerated pervious concrete, and determining the usage amount of the raw materials through the production ratio;
s2, preparing the raw materials into the rough regenerated pervious concrete by a two-step stirring method;
s3, carrying out secondary deep processing of texture and coloring on the rough recycled permeable concrete according to the actual use environment to obtain the finished recycled permeable brick or board.
Preferably, in order to further achieve easy mixing of recycled aggregate, recycled powder and recycled light material prepared from various wastes and improve strength and defects of the recycled aggregate, the two-step stirring method comprises the following steps:
(1) firstly putting 1/2-dosage recycled aggregate with production mixing proportion, then sequentially putting 1/3-dosage cement, recycled powder, construction quick-setting resin powder and an additive with production mixing proportion, stirring for 5min, and standing for 15min to form dilute slurry;
(2) adding 1/2 amount of recycled aggregate into the thin slurry again, then sequentially adding 2/3 amount of cement, recycled powder, building quick-setting resin powder and additive in production proportion, stirring for 5min to be uniform, simultaneously adding recycled light material while stirring, and uniformly stirring until integral slurry is formed, namely the rough recycled pervious concrete; the method comprises the steps of utilizing a twice stirring method, reducing crack defects of the recycled aggregate after the first stirring, filling gaps of the recycled aggregate with recycled powder, utilizing cement as a bearing agent, and utilizing building quick-setting resin glue powder to accelerate the gap repair time of the recycled aggregate.
The invention has the beneficial effects that:
1. the preparation method comprises the steps of determining the preparation strength and the water-gel ratio of the regenerated permeable concrete by utilizing various classified and recycled wastes and taking actual preparation conditions as references, determining the density and the air content of slurry of the regenerated permeable concrete by combining the using amount of each raw material, determining the standard mix proportion of the regenerated permeable concrete on the basis of the determined density and air content, deducing the production mix proportion of the regenerated permeable concrete by combining actual standards and the standard mix proportion, further deducing the raw material proportion and the using amount to construct a preparation data model of the regenerated permeable concrete, further providing data support for the compatibility of each waste, further reducing the generation of wastes in a preparation stage, and reducing the preparation cost.
2. The particle size and the source are taken as reference objects, and the selection range of the solid waste is expanded beyond the specified standard, so that the source of the raw materials is increased, and the integral life significance is increased.
3. The preparation strength ratio is reversely deduced by using a numerical value specified by a standard, so that the precise algorithm proportion of the proportion is provided, the condition of excess materials is avoided, and the preparation cost is reduced.
4. The water-gel ratio is calculated by utilizing the determined numerical value, so that the regenerated powder can be fully gelled and mixed with other raw materials of the regenerated pervious concrete, the subsequent compatibility of various wastes is paved, and meanwhile, the condition of process excess materials can be reduced by the determined formula numerical value, and the preparation cost is reduced.
5. On the basis of the trial mixing quantity Q, the total water consumption, the total gelling consumption, the additive water content, the regenerated powder consumption, the cement water consumption and the consumption of special auxiliary materials for the regenerated light concrete are calculated by using standard test values, and the risk of excess materials in the process is reduced by determining the consumption of the regenerated pervious concrete, so that the preparation cost is reduced.
6. The single-side volumes of the recycled aggregate and the recycled light material are utilized to reversely deduce the usage amount of each raw material, so that the determination of the initial fixed usage amount of the whole raw material is realized, the traditional weight calculation is distinguished, the actual preparation volume and the corresponding volume usage amount are more met, and the purpose of reducing the preparation cost is realized.
7. The water absorption values of the recycled aggregate and the recycled light material are determined by detecting the error adjustment coefficient through the actually measured water content, powder content and water absorption of the recycled aggregate and the recycled light material, so that the accurate calculation of the actual production water consumption is realized, the condition that the slurry is viscous or loose due to too low or too high water amount in the preparation stage is reduced, and the preparation cost is saved.
8. The method comprises the steps of utilizing a twice stirring method, reducing crack defects of the recycled aggregate after the first stirring, filling gaps of the recycled aggregate with recycled powder, utilizing cement as a bearing agent, and utilizing building quick-setting resin glue powder to accelerate the gap repair time of the recycled aggregate.
Detailed Description
The technical solutions of the present invention are described in further detail below, but the scope of the present invention is not limited to the following.
In the raw materials, the cement is 42.5 ordinary portland cement, and the coefficient of richness is 1.1; the admixture adopts a leian high-efficiency composite water reducing agent, the mixing amount is 3 percent, and the solid content is 24 percent; commercial building instant resin powder with the mixing amount of 0.2 percent; the additive is a naphthalene-series composite water reducing agent, and the solid content of the additive is 24%.
Example 1
With C15Permeable pavement brick fck10MPa, specification 200 × 100 × 60, specification: corresponding tensile strength fuIs 3.0, flexural strength Rf3.0, and the B grade of the water permeability coefficient is more than or equal to 1x10-2The continuous porosity p% is not less than 10%, as an example.
A preparation method of a regenerated water-permeable concrete pavement brick or slab comprises the following steps:
s1, crushing the solid wastes, classifying and recycling the solid wastes, and distinguishing the solid wastes according to the recycled powder, the recycled light material and the recycled aggregate to obtain recycled raw materials; categorised recovery do to the building class solid waste mixture including discarded mortar piece, concrete piece and ceramic tile includes the inorganic rubbish of industry class solid of useless rock mass, and through now ripe stoving and milling equipment, according to volume ratio 2: 1 the single-particle fraction with the particle diameter of 4.0mm, the crushing value s percent of 46 percent and the measured standard penetration density of 2437kg/m are obtained3The recycled aggregate of (4); the rapeseed straw crushed material which is single agricultural waste is used for preparing the rapeseed straw crushed material with the grain size of 0.15mm, the volume mixing amount of 2 percent and the actually measured apparent density of 547kg/m3The regenerated light material is prepared by mixing the raw materials in a volume ratio of 1:1, mixing, crushing and drying to obtain regenerated powder with the particle size of 0.15mm, the strength activity index f percent of 54 percent and the mixing amount of 40 percent; the particle size and the source are taken as reference objects, and the selection range of the solid waste is expanded beyond the specified standard, so that the source of the raw materials is increased, and the integral life significance is increased;
s2, determining the preparation strength of the regenerated pervious concrete and the water-cement ratio of the regenerated pervious concrete according to the characteristics of the prepared standard pavement brick or pavement slab of the regenerated raw materials and the raw material formulas of water, cement, regenerated powder, regenerated light material, regenerated aggregate, admixture, auxiliary materials and compensation materials; the method for determining the preparation strength of the regenerated pervious concrete comprises the following steps:
(1) determining the continuous porosity p% of the regenerated water-permeable concrete brick or plate, taking 10-20%;
(2) detecting the strength activity index f% of the regenerated powder by using the method 3.6 in the GB/T1596-2017 standard;
(3) detecting a crushing value index s% of the recycled aggregate according to the method 6.12 in JGJ 52-2006;
(4) determining the design strength f of the regenerated pervious concreteckAnd intensity standard deviation σ: the permeable concrete has the strength grade of C15，C20，C25，C30According to the strength grade of the corresponding permeable concrete brick or board, C15Sigma of 3MPa, C20And the following sigma is 4MPa, C30And σ below is 5MPa, so C here15The sigma of (2) is 3 MPa;
(5) determining the preparation strength R of the regenerated pervious concrete rotary or platej：
Rj＝[fck*(1+s％)+1.645*σ*(2.3-f％)]*(1+p％)＝＝[15*(1+46％)+1.645*3*(2.3-54％)]33.6MPa (1+ 10%); the preparation strength ratio is reversely deduced by using a numerical value specified by a standard, so that the precise algorithm proportion of the proportion is provided, the condition of excess materials is avoided, and the preparation cost is reduced.
The water-cement ratio of the regenerated permeable concrete is determined by JGJ55-2011 item 5.1 and a formula:
Figure BDA0002462548910000081
fb＝yf*ys*fce＝0.6*1*46.75＝28.05MPa，
fce＝fc*g＝1.1*42.5＝46.75MPa，
wherein W is the water-gel ratio, W is less than or equal to 0.4, and when W exceeds 0.4, the W is 0.4; alphaaAnd alphabIs an aggregate regression coefficient, alphaa＝0.53，ɑb＝0.2；RjPreparing strength for the regenerated pervious concrete; f. ofbThe compressive strength of the gelled material is 28 days; f. ofceThe cement mortar has 28 days mortar compressive strength; y iscIs the coefficient of richness of the cement; y isfThe influence coefficient of the regenerated powder; y issThe influence coefficient of the mineral powder is ys 1; g is the cement strength grade value; the water-gel ratio is calculated by utilizing the determined numerical value, so that the regenerated powder can be fully gelled and mixed with other raw materials of the regenerated pervious concrete, the subsequent compatibility of various wastes is paved, and meanwhile, the condition of process excess materials can be reduced by the determined formula numerical value, and the preparation cost is reduced;
the method for determining the dosage of the raw materials for forming the regenerated pervious concrete slurry comprises the following steps:
(1) calculating the minimum trial mixing amount: minimum trial mixing quantity Q is volume V according to the required quantity of detection containerr*1.5*2000＝0.02*1.5*2000＝60kg；
(2) Determining the initial quantitative amount of each raw material of the slurry: calculated by the following formula:
the total water consumption:
Figure BDA0002462548910000091
total gel dosage:
Figure BDA0002462548910000092
the dosage of the additive is as follows: wy＝Jz*Wc＝42.75*3％＝1.28kg
Water content of the additive: wh＝Wy*(1-Wg)＝1.28*(1-24％)＝0.97kg；
The amount of the regenerated powder is as follows: fy＝Jz*Fc＝42.75*40％＝17.1kg；
The cement dosage is as follows: sy＝Jz-Fy＝42.75-17.1＝25.65kg；
The water consumption of cement: w ═ Wz-Wh＝17.1-0.97＝16.13kg；
The dosage of the special auxiliary materials for the recycled lightweight concrete is as follows: sn＝Jz*Sc＝42.75*0.2％＝0.09kg，
In the formula, SjIs a water-to-glue ratio, WcIs the mixing amount of the additive, WgIs the fixed amount of the additive, Fc is the mixing amount of the regeneration powder, ScThe amount of the special auxiliary material for the regenerated lightweight concrete is the blending amount; on the basis of the trial mixing quantity Q, calculating the total water consumption, the total gelling consumption, the additive water content, the regenerated powder consumption, the cement water consumption and the consumption of special auxiliary materials for the regenerated light concrete by using standard test values, and further reducing the risk of excess materials in the process and further reducing the preparation cost by determining the consumption of the regenerated pervious concrete;
s3, determining the use amount of each raw material for forming the regenerated pervious concrete slurry, and mixing the slurry by taking the preparation strength and the water-to-glue ratio as standards to obtain the regenerated pervious concrete slurry;
s4 determination of density P of regenerated pervious concrete slurrym＝1912kg/m3Determining the use amount of the regeneration raw material by using the density and the gas content, and determining the reference mixing ratio of the regenerated pervious concrete; the method for determining the reference mix proportion of the regenerated pervious concrete comprises the following steps:
(1) detecting the recycled aggregate according to a JGJ52-2006 screening test;
(2) setting the aggregate left by screening to be equivalent to a cube with the average grain diameter as the side length according to screening test data;
(3) calculating the average grain diameter of the recycled aggregate in each grid: the average particle size of each grid of sieve is (the side length of the square mesh of the screen in the grid plus the side length of the square mesh of the screen in the previous grid)/2;
(4) calculating the overall average particle size of the recycled aggregate:
1) the average volume of each screen of single particles is equal to the cube of the average particle size of each screen;
2) the mass of each grid of the single particles is equal to the average volume of each grid of the single particles and the apparent density of the recycled aggregate/1000000;
3) the number of the particles of the recycled aggregate which is sieved out of each grid is equal to the corresponding sieving residual value of each grid/the mass of a single particle which is sieved out of each grid;
4) the total average particle size of the recycled aggregate is equal to the sum of the average particle size of each grid sieve and the number of the recycled aggregates per grid sieve and/or the cumulative sum of the number of the recycled aggregates per grid sieve, and the total average particle size of the recycled aggregate is 3.15 mm;
(5) determining the use amount of the recycled aggregate:
1) regenerated aggregate cube volume (regenerated aggregate overall average particle size)3
2) Determining the net distance of the recycled aggregate by an equal pressure method: the net distance of the recycled aggregate (total average particle size of the recycled aggregate) and the preparation strength of the recycled pervious concrete/28-day mortar compressive strength of the cementing material (3.8284-3.15-25.6/28.05/3.8284-0.75 mm);
3) determination of void fraction of recycled aggregate
Figure BDA0002462548910000101
4) The single volume of the recycled aggregate (1-theoretical porosity of recycled aggregate) × (1-porosity of product) ═(1-47.3%) × (1-0.1) ═ 0.474m3；
5) The volume of the single amount of the recycled aggregate is 0.474 and 2437 and 1155 kg;
(6) determining the volume and the dosage of the regenerated light material:
1) determining the volume of the regenerated light material:
air content of slurry (1-volume of recycled aggregate-porosity of product) 1.5% (1-0.474-0.1) ═ 0.006m3；
Single volume Vq of recycled light material (1-single volume of recycled aggregate-porosity of product-gas containing volume) Qt＝(1-0.474-0.1-0.006)*2％＝0.008m3，
Qt is the volume doping value of the regenerated light material accounting for the slurry, and is 2-5%.
2) Determining the use amount of the regenerated light material:
Qv-Vq-apparent density of regenerated light material 0.008-547-4.38 kg
(7) Determining the single formula volume of the net slurry body and the dosage of the single formula net slurry body:
the volume of the net slurry is 1-the volume of the recycled aggregate, the porosity of the product, the gas containing volume, the volume of the recycled light material is 1-0.474-0.1-0.006-0.008-0.412 m3；
The amount of the net slurry is equal to the density of the net slurry, and the single volume of the net slurry is 1912, 0.412, 787.7 kg;
(8) determining the initial quantitative amount of each raw material:
the total water consumption:
Figure BDA0002462548910000111
total gel dosage:
Figure BDA0002462548910000112
the dosage of the additive is as follows: wy＝Jz*Wc＝560*3％＝16.8kg；
Water content of the additive: wh＝Wy*(1-Wg)＝16.8*(1-24％)＝12.8kg；
The amount of the regenerated powder is as follows: fy＝Jz*Fc＝560*40％＝224kg；
The cement dosage is as follows: sy＝Jz-Fy＝560-224＝336kg；
The water consumption of cement: w ═ Wz-Wh＝224-12.8＝211.2kg；
The dosage of the special auxiliary materials for the recycled lightweight concrete is as follows: sn＝Jz*Sc＝560*0.2％＝1.12kg，
In the formula, Q is the determined dosage of the pure slurry; sj to itWater-to-glue ratio; wcIs the admixture mixing amount; wgIs the solid content of the additive; fcThe mixing amount of the regeneration powder; scThe value is 0.2 percent of the mixing amount of the building rubber powder;
(9) synthesizing the dosage and the proportion of each raw material, namely the reference mix proportion of the regenerated pervious concrete; the single volume of the recycled aggregate and the recycled light material is utilized to reversely deduce the usage amount of each raw material, so that the determination of the initial fixed usage amount of the whole raw material is realized, the traditional weight calculation is distinguished, the actual preparation volume and the corresponding volume usage amount are more met, and the purpose of reducing the preparation cost is realized;
s5, determining the production mix proportion of the regenerated pervious concrete according to the actual detection index on the basis of determining the regenerated pervious concrete; the method for determining the production mix proportion of the regenerated pervious concrete comprises the following steps:
(1) actually measuring the water content, the powder content and the water absorption of the recycled aggregate and the recycled light material, wherein the water content, the powder content and the water absorption are respectively 1.5% of the recycled aggregate, 6% of the water absorption and 0% of the powder content, and 0% of the recycled light material, 135% of the water absorption and 1% of the powder content;
(2) on the basis of the reference mixing ratio, the use amount of the raw materials is increased according to the water content and the powder content, and the water consumption during production is determined as follows:
the production water consumption is the water consumption of a reference mixing ratio, the recycled aggregate using amount of the reference mixing ratio, the water content of the recycled aggregate, the recycled light material using amount of the reference mixing ratio, the water absorption rate of the recycled aggregate, 0.96+ the water absorption rate of the recycled light material, 0.32-211.2 + 1155%, 0.96+ 4.38% 135% and 0.32-1155% 1.5% 262,
in the formula, 0.96 and 0.32 are detection error adjustment coefficients of the water absorption of the recycled aggregate and the recycled light material, and the water absorption is the water absorption value of the solid material of the recycled aggregate or the recycled light material;
(3) on the basis of the use amount of the reference mixing proportion, the production mixing proportion of the regenerated pervious concrete is obtained by combining the production water consumption:
water: cement: regeneration of powder: light material regeneration: recycled aggregate: building instant resin glue powder: the admixture is 262: 336: 224: 4.42: 1172: 1.12: 16.8 of the total weight of the mixture; the water absorption values of the recycled aggregate and the recycled light material are determined by detecting the error adjustment coefficient through the actually measured water content, powder content and water absorption of the recycled aggregate and the recycled light material, so that the accurate calculation of the actual production water consumption is realized, the condition that the slurry is viscous or loose due to too low or too high water amount in the preparation stage is reduced, and the preparation cost is saved.
The invention also provides an application of the preparation method of the regenerated water-permeable concrete pavement brick or slab, which comprises the following steps:
s1, detecting the indexes of the raw materials of the regenerated pervious concrete, and determining the usage amount of the raw materials through the production ratio;
s2, preparing the raw materials into the rough regenerated pervious concrete by a two-step stirring method; the two-step stirring method comprises the following steps:
(1) firstly, 586kg of recycled aggregate with production mix proportion is put into production, then 112kg of cement, 75kg of recycled powder, 0.37kg of construction quick-setting resin powder and 5.6kg of admixture with production mix proportion are put into production in sequence, and at the same time 262kg of water is added, and the mixture is stirred for 5min and then stands for 15min to form thin slurry;
(2) adding 586kg of recycled aggregate into the thin slurry again, then sequentially adding 224kg of cement, 149kg of recycled powder, 0.75kg of building quick-setting resin glue powder and 11.2kg of admixture in production mixing ratio, stirring for 5min till uniformity, simultaneously adding 4.42kg of recycled light material while stirring till integral slurry is formed, namely the rough recycled pervious concrete; by using a twice stirring method, after the first stirring, the crack defect of the recycled aggregate is reduced, the gap of the recycled aggregate is filled with recycled powder, cement is used as a bearing agent, the gap repair time of the recycled aggregate is accelerated by building quick-setting resin glue powder, and during the second stirring, slurry of thin slurry is ensured to be fully wrapped around the recycled aggregate, so that the slurry at the connecting part of the recycled aggregate has enough bonding and force transferring capacity, the strength and the workability are ensured, the process step that the traditional recycled aggregate needs to be independently strengthened is changed, and the recycled raw materials prepared by wastes are fully compatible;
s3, carrying out secondary deep processing of texture and coloring on the rough regenerated permeable concrete according to the actual use requirement of the product to obtain the finished regenerated permeable brick or board.
Example 2
According to C15Standard for paving bricks, more correctly classified recovery as mixing of construction-like solid waste comprising waste bricks with industrial-like solid waste comprising waste mineral aggregatesMachine rubbish to through present ripe stoving and milling equipment, according to volume ratio 1:1 the single-particle grade with the particle diameter of 3.6mm, the water absorption of 3.2 percent and the measured standard density of 2601kg/m are obtained3The recycled aggregate of (4); the single forestry waste garden dried waste wood branch and leaf crushed aggregates are used for preparing the waste wood branch and leaf crushed aggregates with the particle size of 0.112mm, the water absorption of 129 percent and the actually measured apparent density of 627kg/m3The regenerated light material is prepared by crushing and drying waste drilling mud to obtain regenerated powder with the particle size of 0.15mm, the strength activity index f percent of 89 percent and the mixing amount of 40 percent; the rest of the procedure and the recipe were the same as in example 1.
Example 3
According to C20The standard of pavior brick, correct categorised recovery do to building class solid waste including abandonment fragment of brick and useless ceramic tile is through present ripe stoving and milling equipment, according to volume ratio 1:0.5 to obtain a single-particle fraction with the particle size of 3.11mm, the water absorption of 2.9 percent and the measured standard density of 2564kg/m3The recycled aggregate of (4); the agricultural waste of the waste straw is mixed with the commercial waste of the waste polyphenyl board, and the mixture is crushed according to the volume ratio of 1.5:0.5 to prepare the waste polyphenyl board with the particle size of 0.131mm, the water absorption of 148 percent and the actually measured apparent density of 575kg/m3The light material is regenerated; crushing and drying the building solid garbage of waste concrete blocks and waste brick blocks according to the volume ratio of 1:1 to obtain regenerated powder with the particle size of 0.15mm, the strength activity index f percent of 71 percent and the mixing amount of 40 percent; the rest of the procedure and the recipe were the same as in example 1.
Example 4
According to C25The standard of pavior brick, correct categorised recovery do to including the building class solid waste of useless concrete block and useless mortar piece, through present ripe stoving and milling equipment, according to volume ratio 2: 1 single-particle grade with the particle size of 1.16mm, the water absorption of 4.2 percent and the measured standard density of 2511kg/m3The recycled aggregate of (4); mixing agricultural wastes of waste straws with forestry wastes of waste dry rattans, crushing the materials according to the volume ratio of 1:0.5 to prepare the forestry wastes with the particle size of 0.096mm, the water absorption of 117 percent and the actually measured apparent density of 598kg/m3The regeneration light material is prepared from the building solid garbage of waste concrete blocks and waste tiles according to the volume ratio of 1: 1:0.5, pulverizing and dryingObtaining regenerated powder with the particle size of 0.15mm, the strength activity index f percent of 79 percent and the mixing amount of 40 percent; the rest of the procedure and the recipe were the same as in example 1.
Example 5
According to C30The standard of the pavement bricks is corrected and classified to recover the brick, namely, the industrial solid inorganic garbage of the building solid garbage mixed with the waste mountain stone containing the waste mortar blocks is prepared into a single-particle grade with the particle size of 1.94mm, the water absorption of 2.2 percent and the measured standard density of 2478kg/m by the mature drying and grinding equipment according to the volume ratio of 1:0.63The recycled aggregate of (4); mixing agricultural wastes of waste wheat straws with commercial wastes of waste foam plastics, crushing the commercial wastes according to the volume ratio of 1:0.5 to prepare the mixture with the particle size of 0.084mm, the water absorption of 131 percent and the actually measured apparent density of 491kg/m3The regeneration light material is prepared by mixing building solid garbage of waste ceramic tiles with industrial solid inorganic garbage of waste carbon slag according to the volume ratio of 1:0.2, and crushing and drying to obtain regeneration powder with the particle size of 0.15mm, the strength activity index f percent of 68 percent and the mixing amount of 40 percent; the rest of the procedure and the recipe were the same as in example 1.
Example 6
According to C15The standard of the pavement slab is corrected and classified and recycled into that the construction solid garbage comprising waste bricks and waste concrete blocks is prepared into single-particle grade with the particle size of 1.11mm, the water absorption of 3.5 percent and the measured standard density of 2493kg/m by the mature drying and grinding equipment according to the volume ratio of 1:0.33The recycled aggregate of (4); agricultural wastes of waste rapeseed stems and waste rapeseed shells are mixed according to the volume ratio of 2: 1, the particle size is 0.134mm, the water absorption is 151 percent, and the actually measured apparent density is 518kg/m3The regeneration light material is prepared by crushing and drying the building solid garbage of the waste mortar and the waste ribbon board according to the volume ratio of 1:0.5 to obtain regeneration powder with the particle size of 0.15mm, the strength activity index f percent of 77 percent and the mixing amount of 40 percent; the rest of the procedure and the recipe were the same as in example 1.
Example 7
According to C20The standard of road slab is corrected and classified and recycled into the standard, the standard is prepared by using building solid garbage comprising waste concrete blocks through the mature drying and grinding equipmentThe obtained single-particle fraction has the particle size of 1.25mm, the water absorption of 3.6 percent and the measured standard density of 2507kg/m3The recycled aggregate of (4); using agricultural wastes of waste corncobs and crushed materials to prepare the corn cobs with the particle size of 0.122mm, the water absorption of 141 percent and the actually measured apparent density of 556kg/m3The light material is regenerated; crushing and drying the building solid garbage of waste mortar and waste stone powder according to the volume ratio of 1:0.5 to obtain regenerated powder with the particle size of 0.15mm, the strength activity index f percent of 80 percent and the mixing amount of 40 percent; the rest of the procedure and the recipe were the same as in example 1.
Example 8
According to C25The standard of the pavement slab is corrected and classified to recover, namely, the construction solid garbage comprising waste porcelain bricks and waste gravels is prepared into a single-particle grade with the particle size of 3.07mm, the water absorption of 3.4 percent and the measured standard density of 2612kg/m by the mature drying and grinding equipment according to the volume ratio of 1:13The recycled aggregate of (4); mixing agricultural wastes of waste straws with commercial wastes of waste straw boards according to the volume ratio of 1:0.5, and crushing to obtain the product with the particle size of 0.056mm, the water absorption of 145 percent and the actually measured apparent density of 534kg/m3The light material is regenerated; mixing building solid waste of waste mortar with industrial solid inorganic waste of fly ash burnt by household garbage, and crushing and drying the industrial solid inorganic waste according to the volume ratio of 1:0.3 to obtain regenerated powder with the particle size of 0.15mm, the strength activity index f percent of 83 percent and the mixing amount of 40 percent; the rest of the procedure and the recipe were the same as in example 1.
Example 9
According to C30The standard of the pavement slab is corrected and classified into that the construction solid garbage comprising waste concrete blocks, waste bricks and waste ceramic tiles is prepared into a single-particle grade with the particle size of 3.51mm, the water absorption of 3.0 percent and the measured standard density of 2534kg/m by the mature drying and grinding equipment according to the volume ratio of 1:0.5:13The recycled aggregate of (4); mixing agricultural wastes of waste chaff particles with forestry wastes of waste sawdust particles according to the volume ratio of 1:2, and preparing the forestry wastes with crushed materials to obtain the forestry wastes with the particle size of 0.107mm, the water absorption of 138 percent and the actually measured apparent density of 582kg/m3The light material is regenerated; industry of fly ash from incineration of construction solid waste mixed with domestic waste by using waste mortar and waste ceramic tileThe solid inorganic garbage is crushed and dried according to the volume ratio of 1:0.5:0.25 to obtain regenerated powder with the particle size of 0.15mm, the strength activity index f percent of 85 percent and the mixing amount of 40 percent; the rest of the procedure and the recipe were the same as in example 1.
The calculated reference mix ratios in the respective examples were used to obtain table 1,
TABLE 1 reference compounding ratio of each example
Figure BDA0002462548910000151
The products of the examples were tested according to the requirements of GB/T25993-2010, following the raw material formulation of Table 1, to give Table 2:
TABLE 2 Properties of the products of the examples
Figure BDA0002462548910000152
Figure BDA0002462548910000161
As can be seen from table 2, when the formulation related to example 1 is adopted, the prepared recycled water-permeable concrete pavement brick has an average flexural strength value of 5.6MPa and an average tensile strength value of 5.6MPa, and the corresponding permeability coefficient is 0.026m/s, the length of the grinding pit is 31, and the BPN is 68, which proves the superiority of the invention and realizes effective recycling of waste resources in the production of the water-permeable concrete pavement brick or slab.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (9)

1. A method for preparing a regenerative pervious concrete pavement brick or slab is characterized by comprising the following steps: the method comprises the following steps:
s1, crushing the solid wastes, classifying and recycling the solid wastes, and distinguishing the solid wastes according to the recycled powder, the recycled light material and the recycled aggregate to obtain recycled raw materials;
s2, determining the preparation strength of the regenerated pervious concrete and the water-cement ratio of the regenerated pervious concrete according to the characteristics of the prepared standard pavement brick or pavement slab of the regenerated raw materials and the raw material formulas of water, cement, regenerated powder, regenerated light material, regenerated aggregate, admixture, auxiliary materials and compensation materials;
s3, determining the use amount of each raw material for forming the regenerated pervious concrete slurry, and mixing the slurry by taking the preparation strength and the water-to-glue ratio as standards to obtain the regenerated pervious concrete slurry;
s4, measuring the density and the gas content of the regenerated pervious concrete slurry, determining the use amount of the regenerated raw materials by using the density and the gas content, and determining the reference mixing proportion of the regenerated pervious concrete;
s5, on the basis of determining the regenerated pervious concrete, determining the production mix proportion of the regenerated pervious concrete according to the actual detection index.
2. The method for preparing the recycled water-permeable concrete pavement brick or slab according to claim 1, characterized in that: the classified recovery is that the building solid inorganic garbage and/or the industrial solid inorganic garbage are prepared by ready-made cooked drying and grinding equipment to obtain regenerated powder with the particle size of less than 0.15mm, the building solid inorganic garbage selects one or more than one of waste bricks, waste ribbon boards, waste ceramic tiles, waste concrete blocks, waste mortar and sandstone waste, and the industrial solid inorganic garbage selects one or more than one of drilling waste, metallurgical waste, mining waste, fuel waste and chemical waste; preparing a recycled light material with the particle size of not more than 2.5mm by using one or more of commercial garbage, agricultural garbage and forestry garbage, wherein the commercial garbage is one or more of polyester boards, waste perlite products, waste straw products, waste ceramsite products and disposable lunch boxes, the agricultural garbage is one or more of straws, rapeseed straws, corn cobs and shells, and the forestry garbage is one or more of roots, stems, leaves and shells of forestry plants; the recycled aggregate with the grain size of 0.15-5mm is prepared by using mature drying and grinding equipment prepared from building solid inorganic garbage and/or industrial solid inorganic garbage, wherein the building solid inorganic garbage selects one or more than one of waste bricks, waste ribbon boards, waste ceramic tiles, waste concrete blocks, waste mortar and sandstone waste, and the industrial solid inorganic garbage selects one or more than one of drilling particles, metallurgical waste residues, mining waste stones and chemical waste solid particles.
3. The method for preparing the recycled water-permeable concrete pavement brick or slab according to claim 1, characterized in that: the method for determining the preparation strength of the regenerated pervious concrete comprises the following steps
(1) Determining the continuous porosity p% of the regenerated water-permeable concrete brick or plate, taking 10-20%;
(2) detecting the strength activity index f% of the regenerated powder by using the method 3.6 in the GB/T1596-2017 standard;
(3) detecting a crushing value index s% of the recycled aggregate according to the method 6.12 in JGJ 52-2006;
(4) determining the design strength f of the regenerated pervious concreteckAnd intensity standard deviation σ: the permeable concrete has the strength grade of C15，C20，C25，C30According to the strength grade of the corresponding permeable concrete brick or board, C15Sigma of 3MPa, C20And the following sigma is 4MPa, C30And the following sigma is 5 MPa;
(5) determining the preparation strength R of the regenerated pervious concrete rotary or platej：
Rj＝[fck*(1+s％)+1.645*σ*(2.3-f％)]*(1+p％)。
4. The method for preparing the recycled water-permeable concrete pavement brick or slab according to claim 1, characterized in that: the water-cement ratio of the regenerated permeable concrete is determined by JGJ55-2011 item 5.1 and a formula:
Figure FDA0002462548900000021
fb＝yf*ys*fce，
fce＝fc*g，
wherein W is the water-gel ratio, W is less than or equal to 0.4, and when W exceeds 0.4, the W is 0.4; alphaaAnd alphabIs an aggregate regression coefficient, alphaa＝0.53，ɑb＝0.2；RjPreparing strength for the regenerated pervious concrete; f. ofbThe compressive strength of the gelled material is 28 days; f. ofceThe cement mortar has 28 days mortar compressive strength; y iscIs the coefficient of richness of the cement; y isfThe influence coefficient of the regenerated powder; y issThe influence coefficient of the mineral powder is ys 1; and g is the cement strength grade value.
5. The method for preparing the recycled water-permeable concrete pavement brick or slab according to claim 1, characterized in that: the method for determining the dosage of the raw materials for forming the regenerated pervious concrete slurry comprises the following steps:
(1) calculating the minimum trial mixing amount: minimum trial mixing quantity Q is volume V according to the required quantity of detection containerr*1.5*2000；
(2) Determining the initial quantitative amount of each raw material of the slurry: calculated by the following formula:
the total water consumption:
Figure FDA0002462548900000022
total gel dosage:
Figure FDA0002462548900000023
the dosage of the additive is as follows: wy＝Jz*Wc
Water content of the additive: wh＝Wy*(1-Wg)；
The amount of the regenerated powder is as follows: fy＝Jz*Fc；
The cement dosage is as follows: sy＝Jz-Fy；
The water consumption of cement: w ═ Wz-Wh；
The dosage of the special auxiliary materials for the recycled lightweight concrete is as follows: sn＝Jz*Sc，
In the formula, SjIs a water-to-glue ratio, WcIs the mixing amount of the additive, WgIs the fixed amount of the additive, Fc is the mixing amount of the regeneration powder, ScIs the mixing amount of the special auxiliary material for the regenerated lightweight concrete.
6. The method for preparing the recycled water-permeable concrete pavement brick or slab according to claim 1, characterized in that: the method for determining the reference mix proportion of the regenerated pervious concrete comprises the following steps:
(1) detecting the recycled aggregate according to a JGJ52-2006 screening test;
(2) setting the aggregate left by screening to be equivalent to a cube with the average grain diameter as the side length according to screening test data;
(3) calculating the average grain diameter of the recycled aggregate in each grid: the average particle size of each grid of sieve is (the side length of the square mesh of the screen in the grid plus the side length of the square mesh of the screen in the previous grid)/2;
(4) calculating the overall average particle size of the recycled aggregate:
1) the average volume of each screen of single particles is equal to the cube of the average particle size of each screen;
2) the mass of each grid of the single particles is equal to the average volume of each grid of the single particles and the apparent density of the recycled aggregate/1000000;
3) the number of the particles of the recycled aggregate which is sieved out of each grid is equal to the corresponding sieving residual value of each grid/the mass of a single particle which is sieved out of each grid;
4) the total average particle size of the recycled aggregate is the sum of the average particle size of each grid sieve and the number of the recycled aggregate particles per grid sieve and/or the cumulative sum of the number of the recycled aggregate particles per grid sieve;
(5) determining the use amount of the recycled aggregate:
1) regenerated aggregate cube volume (regenerated aggregate overall average particle size)3
2) Determining the net distance of the recycled aggregate by an equal pressure method: the net distance of the recycled aggregate (total average particle size of the recycled aggregate) is the preparation strength of the recycled pervious concrete/the compressive strength of the cement for 28 days/3.8284;
3) determination of void fraction of recycled aggregate
Figure FDA0002462548900000031
4) Single volume of recycled aggregate (1-theoretical porosity of recycled aggregate) by (1-porosity of product);
5) the single amount of the recycled aggregate is equal to the volume of the single amount of the recycled aggregate and the apparent density of the recycled aggregate;
(6) determining the volume and the dosage of the regenerated light material:
1) determining the volume of the regenerated light material:
air content of the slurry (1-simple volume of recycled aggregate-porosity of the product);
single volume Vq of recycled light material (1-single volume of recycled aggregate-porosity of product-gas containing volume) Qt；
Qt is the volume doping value of the regenerated light material accounting for the slurry, and is 2-5%.
2) Determining the use amount of the regenerated light material:
qv Vq apparent density of regenerated light material
(7) Determining the single formula volume of the net slurry body and the dosage of the single formula net slurry body:
the single volume of the clean slurry body is 1, the single volume of the recycled aggregate, the porosity of the product, the gas containing volume and the single volume of the recycled light material;
the amount of the net slurry is the density of the net slurry and the single volume of the net slurry;
(8) determining the initial quantitative amount of each raw material:
the total water consumption:
Figure FDA0002462548900000041
total gel dosage:
Figure FDA0002462548900000042
the dosage of the additive is as follows: wy＝Jz*Wc
Water content of the additive: wh＝Wy*(1-Wg)；
The amount of the regenerated powder is as follows: fy＝Jz*Fc；
The cement dosage is as follows: sy＝Jz-Fy；
The water consumption of cement: w ═ Wz-Wh；
The dosage of the special auxiliary materials for the recycled lightweight concrete is as follows: sn＝Jz*ScWherein Q is the determined dosage of the pure slurry; sj to itWater-to-glue ratio; wcIs the admixture mixing amount; wgIs the solid content of the additive; fcThe mixing amount of the regeneration powder; scThe value is 0.2-0.5% of the mixing amount of the building glue powder;
(9) and (3) synthesizing the dosage and the proportion of each raw material to obtain the reference mixing ratio of the regenerated pervious concrete.
7. The method for preparing the recycled water-permeable concrete pavement brick or slab according to claim 1, characterized in that: the method for determining the production mix proportion of the regenerated pervious concrete comprises the following steps:
(1) actually measuring the water content, the powder content and the water absorption of the recycled aggregate and the recycled light material;
(2) on the basis of the reference mixing ratio, the use amount of the raw materials is increased according to the water content and the powder content, and the water consumption during production is determined as follows:
the production water consumption is the water consumption of the reference mixing ratio, the recycled aggregate amount of the reference mixing ratio, the water content of the recycled aggregate, the recycled light material amount of the reference mixing ratio, the water content of the recycled light material, the recycled aggregate water absorption rate is 0.96, the recycled light material amount is 0.32,
in the formula, 0.96 and 0.32 are detection error adjustment coefficients of the water absorption of the recycled aggregate and the recycled light material, and the water absorption is the water absorption value of the solid material of the recycled aggregate or the recycled light material;
(3) and on the basis of the use amount of the reference mixing proportion, combining the production water consumption to obtain the production mixing proportion of the regenerated pervious concrete.
8. Use of a method for the preparation of a recycled water-permeable concrete pavement brick or slab according to any one of claims 1 to 7, characterized in that: the method comprises the following steps:
s1, detecting the indexes of the raw materials of the regenerated pervious concrete, and determining the usage amount of the raw materials through the production ratio;
s2, preparing the raw materials into the rough regenerated pervious concrete by a two-step stirring method;
s3, carrying out secondary deep processing of texture and coloring on the rough regenerated permeable concrete according to the actual use requirement of the product to obtain the finished regenerated permeable brick or board.
9. The application of the preparation method of the recycled water-permeable concrete pavement brick or slab as claimed in claim 8, wherein the preparation method comprises the following steps: the two-step stirring method comprises the following steps:
(1) firstly putting 1/2-dosage recycled aggregate with production mixing proportion, then sequentially putting 1/3-dosage cement, recycled powder, construction quick-setting resin powder and an additive with production mixing proportion, stirring for 5min, and standing for 15min to form dilute slurry;
(2) and (3) adding 1/2 dosage of recycled aggregate into the thin slurry again, then sequentially adding 2/3 dosage of cement, recycled powder, building quick-setting resin adhesive powder and an additive in production proportion, stirring for 5min till uniformity, simultaneously adding recycled light materials while stirring till integral slurry is formed, namely the rough recycled pervious concrete.
CN202010324142.9A 2020-04-22 2020-04-22 Preparation method and application of regenerated water-permeable concrete pavement brick or slab Pending CN111517716A (en)

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