CN112624683A - Lightweight concrete - Google Patents
Lightweight concrete Download PDFInfo
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- CN112624683A CN112624683A CN202011024713.3A CN202011024713A CN112624683A CN 112624683 A CN112624683 A CN 112624683A CN 202011024713 A CN202011024713 A CN 202011024713A CN 112624683 A CN112624683 A CN 112624683A
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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
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Materials Engineering (AREA)
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Abstract
The present invention relates to a lightweight concrete, wherein the lightweight concrete comprises: the coarse lightweight aggregate is 100 percent of sludge ceramsite; the fine aggregate is 100% of construction waste reclaimed sand; cement; fly ash; and construction waste regeneration powder.
Description
Technical Field
The invention relates to the field of lightweight concrete applied to industrial and civil buildings, in particular to lightweight concrete prepared from sludge ceramsite, construction waste reclaimed sand and reclaimed powder.
Background
The lightweight concrete is prepared from lightweight coarse aggregate, lightweight sand (or common sand), cement and water, and has dry apparent density of no more than 1950kg/m3The concrete of (2). The lightweight concrete has light dead weightCompared with common concrete with the same grade, the self weight can be reduced by more than 20-30%, and the structural heat-insulating lightweight concrete is a wall material with good heat-insulating performance, and the heat conductivity of the structural heat-insulating lightweight concrete is only 12-33% of that of the common concrete. The lightweight concrete has excellent heat insulating performance, and has outstanding effects on reducing the weight of buildings, lowering the construction cost of the buildings, saving resources and the like, so the lightweight concrete is one of the main development directions of the concrete and wall material industries in China.
The silt ceramsite is a lightweight aggregate which is prepared by taking river silt and pond silt as main raw materials, adding a certain amount of auxiliary materials and additives, and drying, homogenizing, fermenting, pelletizing, preheating and roasting. The sludge ceramsite can consume a large amount of sludge, reduce the pollution of the sludge to the environment, turn the harm into the benefit, change the waste into the valuable and has low treatment cost.
At present, the quantity of the construction waste in China accounts for 30 to 40 percent of the total quantity of the urban waste. However, most of the construction wastes are not treated, and are transported to the suburbs or villages by construction units, and are piled or buried in the open air, so that a large amount of construction expenses such as land acquisition expenses and garbage clearing and transporting expenses are consumed, and meanwhile, the problems of scattering, dust, sand flying and the like in the clearing and piling processes cause serious environmental pollution. How to effectively utilize the construction waste into resources and change waste into valuable is a topic which is very concerned by the central government, local governments at all levels, academic circles and business circles of China. Therefore, the recycling of construction waste becomes very important, which not only meets the requirement of ecological environment protection, but also is the requirement of sustainable development.
The construction waste regenerated sand and regenerated powder are produced with waste brick, waste concrete or brick-concrete as material and through pre-sorting, cleaning, crushing, sieving, particle preparing, strengthening, grinding and other technological steps.
China already establishes standards for recycling coarse and fine aggregates of construction wastes for concrete and mortar, and carries out more experimental researches on the use of the recycled aggregates of the construction wastes for preparing concrete. There were few experimental practical engineering application examples in low-strength concrete structural engineering made of construction waste recycled aggregate in some areas before 2014, but the recycled aggregate is basically recycled from waste concrete, and the brick-concrete construction waste recycled aggregate or the waste brick recycled aggregate is rarely used in preparing concrete and mortar. At present, the utilization of construction waste powder is less researched, and the powder is mainly used for producing calcium silicate building blocks and used as a covering material of a household garbage landfill and is not basically used in concrete and mortar.
Disclosure of Invention
The invention aims to improve the comprehensive utilization rate of the sludge and the construction waste in the light concrete.
The invention therefore provides a novel lightweight concrete, wherein the lightweight concrete comprises
The coarse lightweight aggregate is 100 percent of sludge ceramsite,
the fine aggregate is 100 percent of construction waste reclaimed sand,
the cement is prepared by mixing the raw materials of cement,
fly ash, and
building garbage regeneration powder.
In a preferred embodiment of the invention, the cement is bulk p.o42.5 cement.
In some preferred embodiments of the invention, the fly ash is class ii fly ash.
In some preferred embodiments of the present invention, the recycled powder according to the present invention is 300-500m mixture of recycled waste brick micro powder and recycled waste concrete micro powder2Kg (preferably 400 m)2/kg) specific surface area of the regenerated mixed micropowder.
In some preferred embodiments of the present invention, the reclaimed sand according to the present invention is reclaimed mixed fine aggregate consisting of reclaimed waste brick sand and reclaimed waste concrete sand in a mass ratio of 2:8 to 8:2 (preferably 4: 6). Wherein the fineness modulus is 2.8, the content of micropowder is 4.5%, and the apparent density is 2510Kg/m3And the water demand ratio of the regenerated mortar is 1.32.
In some preferred embodiments of the present invention, the lightweight aggregate according to the present invention is a sludge ceramsite, having a particle size of 5-16mm and a bulk volume weight of 400-800kg/m3(600kg/m3) Water absorption of 5 to 10% (preferably 8.5%) (water absorption over 1 hour), and crush index of 1 to 5% (preferably 2.5%).
In some preferred embodiments of the present invention, the lightweight concrete further comprises an additive, and the additive is a polycarboxylic acid water reducing agent.
The lightweight concrete prepared from the sludge ceramsite, the construction waste reclaimed sand and the reclaimed powder comprises the raw materials of the sludge ceramsite, the construction waste reclaimed sand, cement, fly ash, the construction waste reclaimed powder, an additive and water. Wherein the lightweight concrete is used as the column, and the raw material components are cement according to the cement weight ratio: sludge ceramsite: reclaimed sand: fly ash and reclaimed powder: additive: water 1: 1-2: 4-5: 0.5-0.8:0.6-0.8: 0.03-0.05: 1.1-1.3 (preferably 1: 1.61: 4.76: 0.65: 0.70: 0.04: 1.23). The prepared lightweight concrete has good construction performance, light weight and capability of meeting the comprehensive utilization of resources and saving the concrete cost.
The weight ratio of the lightweight concrete W/(C + F + Z) (water-cement ratio) is 0.52. Wherein W represents the amount of water, C represents the amount of cement, F represents the amount of fly ash, and Z represents the amount of reclaimed powder.
The invention also aims to provide a preparation method of the lightweight concrete.
The preparation method of the lightweight concrete prepared by using the sludge ceramsite and the construction waste regeneration material comprises the following steps:
weighing raw materials according to a mixing ratio;
and soaking the weighed sludge ceramsite in water for 1 hour, and filtering clear water to perform pre-wetting treatment.
And pre-mixing the pre-wetted sludge ceramsite, the reclaimed sand, the reclaimed powder, the fly ash and the cement, adding water and an additive, and continuously stirring to finally obtain the concrete.
Slump tests are carried out according to GB/T50080-2016 standard of test method for common concrete mixture performance, the slump is 160 +/-20 mm, the slump is 400 +/-50 mm, and the concrete slump has good workability, cohesiveness, water retention, fluidity and construction performance.
The slump of the concrete is tested to be 140 +/-20 mm after the concrete is kept still for 30 minutes; the slump test is 120 + -20 mm after standing for 60 minutes.
After the concrete is taken out of the machine, the mixed concrete is subjected to test piece forming according to GB/T50081 plus 2019 Standard test method for physical and mechanical properties of common concrete, and then trowel is used for trowelling and is placed into a concrete curing box for curing. And removing the mold after 24 hours, and moving the test piece into a standard curing room for curing (the temperature of the standard curing room is 20 +/-2 ℃, and the humidity is more than or equal to 95%).
And respectively taking out the test piece when the age of the concrete reaches 7 days, 28 days and 60 days, and detecting the compressive strength of the corresponding test piece according to GB/T50081 plus 2019 Standard of test method for physical and mechanical properties of common concrete, wherein the strength of the test piece is respectively 9.7Mp, 17.3Mp and 22.2Mp, and the strength of the test piece in 28 days reaches the design requirement.
Drawings
FIG. 1 is a flow chart of the preparation and process of lightweight concrete prepared by sludge ceramsite and construction waste recycled material.
Detailed Description
The invention is further illustrated by the following non-limiting specific examples. Parts in the present invention are parts by weight unless otherwise specified.
The present invention will be further described with reference to the following specific examples. It should be understood that the following examples are only for illustrating the present invention and are not to be construed as limiting the scope of the present invention.
In the embodiment of the invention, the 'reclaimed sand' is reclaimed mixed fine aggregate consisting of reclaimed waste brick sand and reclaimed waste concrete sand according to the mass ratio of 4: 6; the 'regenerated powder' is prepared from 400m2Recycled waste brick micro powder with specific surface area of/kg and 400m2400m of recycled waste concrete micro powder with specific surface area/kg and mass ratio of 5:52The regeneration mixing of the specific surface area per kg is small, and the total using amount of the regeneration powder and the fly ash for replacing cement reaches 50 percent; the lightweight aggregate is 5-16mm grade 600Sludge ceramsite; the cement is P.O42.5 cement; the additive adopts a polycarboxylic acid high-efficiency water reducing agent. See tables 1 and 2 for specific formulations.
Example 1 preparation of LC10 lightweight concrete sample prepared using sludge ceramsite and construction waste recycled material
The weight ratio of cement to 15 liters per plate is 1: 1.61: 4.76: 0.65:0.70: 0.04: 1.23 respectively weighing cement, sludge ceramsite, reclaimed sand, secondary fly ash, reclaimed powder, an additive and water, wherein the water-to-gel ratio is 0.52. Firstly, pre-wetting weighed ceramsite, soaking the weighed ceramsite in water for 1 hour, filtering out open water, putting the pre-wetted ceramsite, regenerated sand, II-grade fly ash, regenerated powder and cement into a stirrer for pre-mixing for 50 seconds, putting water and an additive into the stirrer for continuously mixing for 150 seconds, taking out the mixed concrete, and molding a test piece according to GB/T50081 plus 2019 Standard of the test method for physical and mechanical properties of common concrete, putting the test piece into a concrete curing box for curing, and removing a mold after 24 hours and moving the test piece into a concrete standard curing room for curing. And taking out the concrete after the age of 28 days, and detecting the strength of the test piece according to GB/T50081-2019 'test method standard for physical and mechanical properties of common concrete', wherein the strength reaches 17.3Mp and meets the strength grade requirement of LC10 concrete.
Example 2 preparation and construction of lightweight concrete prepared from sludge ceramsite and construction waste recycled material
As shown in fig. 1, after a series of related steps such as consignment inspection, concrete trial assembly, application of mixture ratio and the like are firstly carried out on raw materials entering a mixing plant, ceramsite is pre-wetted before production, reclaimed sand, ceramsite, cement, fly ash, reclaimed powder, an additive and water are conveyed to an electronic weighing scale by a belt conveyor, a screw conveyor, an additive pump and a water pump for metering, the pre-wetted ceramsite, reclaimed sand, class II fly ash, reclaimed powder and cement are firstly put into the mixing plant for pre-mixing for 50 seconds, then water and the additive are put into the mixing plant for continuously mixing for 150 seconds, the mixing plant is loaded into a concrete tank truck, the performance inspection such as the concrete leaving-factory slump and the like and the test piece manufacturing are carried out, and the mixing plant is transported to a construction site after the test is qualified.
After being transported to a construction site, the concrete can be poured to a position to be poured in a self-unloading mode, a tower crane mode and the like of a concrete tank truck, and a vibrating rod is used for vibrating to remove air bubbles in the concrete, so that the compactness of the concrete is ensured, the phenomena of easy generation of honeycomb pitted surface and the like after the concrete is solidified are eliminated, and the strength and the quality of a concrete member are ensured. After the concrete is cast and vibrated, after initial setting and before final setting, the surface of the concrete is rolled for 3 times by using a trowel respectively so as to prevent the concrete from generating cracks due to the factors of water loss, drying shrinkage and the like. And after the concrete is finally set, carrying out covering watering maintenance on the surface of the concrete, wherein the covering watering maintenance is not less than 7 days, the watering frequency is determined according to the guarantee that the concrete keeps a moist state, and watering is not required when the daily average temperature is lower than 5 ℃.
Compared with the common C10 concrete, the LC10 lightweight concrete prepared from the sludge ceramsite and the construction waste recycled material has the advantages that the unit volume weight is reduced by 40%, and the cost can be saved by 30 yuan per cubic meter. And a large amount of sludge, construction waste and the like are used, so that the energy is saved, the carbon is low, the environment is protected, and the method has great significance and development prospect.
[ COMPARATIVE EXAMPLES ]
Comparative example 1
The weight ratio of cement to 15 liters per plate is 1: 1.07: 3.52: 0:0.47: 0.03: 0.82 cement, ceramsite, common sand, secondary fly ash, recycled powder, additive and water are respectively weighed, and the water-to-glue ratio is 0.56. Firstly, pre-wetting weighed ceramsite, soaking the weighed ceramsite in water for 1 hour, filtering out open water, putting the pre-wetted ceramsite, common sand, recycled powder and cement into a stirrer for pre-mixing for 50 seconds, then putting the water and additives into the stirrer for continuously stirring for 150 seconds, taking out the mixed concrete, molding a test piece according to GB/T50081 plus material 'standard for testing mechanical properties of common concrete', putting the test piece into a concrete curing box for curing, and removing a mold after 24 hours, and moving the test piece into a concrete standard curing room for curing. And taking out the concrete after the age of 28 days, and carrying out strength detection on a test piece according to GB/T50081 plus 2019 'test method standard for physical and mechanical properties of common concrete', wherein the strength reaches 17.8Mp and meets the strength grade requirement of LC10 concrete, but the cement dosage in the concrete mixing ratio is relatively increased, fly ash is not added, the concrete fluidity is poor, the slump loss is increased over time, the transportation and construction are not facilitated, and meanwhile, the II-grade fly ash and the reclaimed sand are not used, so that the effects of energy conservation, environmental protection and cost saving are weakened.
Comparative example 2
The weight ratio of cement to 15 liters per plate is 1: 1.67: 4.52: 0.65:0.70: 0.04: 1.23 weighing cement, ceramsite, reclaimed sand, secondary fly ash, reclaimed powder, additive and water respectively, wherein the water-to-gel ratio is 0.52. Firstly, pre-wetting weighed ceramsite, soaking the weighed ceramsite in water for 1 hour, filtering out open water, putting the pre-wetted ceramsite, regenerated sand, II-grade fly ash, regenerated powder and cement into a stirrer for pre-mixing for 50 seconds, putting water and an additive into the stirrer for continuously stirring for 150 seconds, taking out the mixed concrete, molding a test piece according to GB/T50081 plus 2016 standard of test methods for mechanical properties of common concrete, putting the test piece into a concrete curing box for curing, and removing a mold after 24 hours and moving the test piece into a concrete standard curing room for curing. After the concrete is in the age of 28 days, the concrete is taken out, and the strength of a test piece is detected according to GB/T50081 plus 2019 standard of test method for physical and mechanical properties of common concrete, the strength reaches 17.1Mp, and the strength grade requirement of LC10 concrete is met, but the sand rate is reduced, the using amount of ceramsite is increased, the slurry amount of concrete is relatively reduced, the workability of concrete is poor, and simultaneously, the ceramsite is lighter and easy to suspend on the surface of the concrete, so that the uniformity of a hardened entity is poor, and the water loss phenomenon of the ceramsite is accelerated, so that cracks are easy to appear on the surface of the concrete.
TABLE 1
TABLE 2
| Water to glue ratio | 0.52 | Water cement ratio | 0.61 | Sand rate | 0.44 | ||
| Name of Material | Cement | Water (W) | Sand | Ceramic particle | Additive agent | Fly ash | Regenerated powder |
| The dosage of each prescription | 150 | 184 | 714 | 242 | 6.3 | 98 | 105 |
| Weight ratio of | 1 | 1.23 | 4.76 | 1.61 | 0.04 | 0.65 | 0.70 |
The invention relates to LC10 lightweight concrete prepared by sludge ceramsite and construction waste recycled material, which has the characteristics of
The following beneficial effects:
the concrete production process is simple, practical and easy to operate; the compressive strength meets the design requirement; the concrete has good workability and small loss of slump over time, and is beneficial to transportation and construction.
And natural material resources are saved. The concrete is prepared by the ceramsite prepared from the sludge in the river channel, the reclaimed sand and the reclaimed powder obtained after the processing treatment of the construction waste, so that the construction waste is recycled, and the national technical and economic policies on saving resources and protecting the environment are implemented.
Energy conservation, consumption reduction and comprehensive utilization of resources. The use of the fly ash and the construction waste reclaimed powder greatly reduces the cement consumption, reduces the energy consumption for producing single concrete, and realizes the effect of comprehensive utilization of resources by using a large amount of construction waste reclaimed sand, reclaimed powder and sludge ceramsite.
And the cost is saved. The use of low-cost materials such as sludge ceramsite, reclaimed sand, reclaimed powder, fly ash and the like greatly reduces the cost of concrete.
It should be noted that the above-mentioned embodiments are only for explaining the present invention, and do not constitute any limitation to the present invention. The present invention has been described with reference to exemplary embodiments, but the words which have been used herein are words of description and illustration, rather than words of limitation. The invention can be modified, as prescribed, within the scope of the claims and without departing from the scope and spirit of the invention. Although the invention has been described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein, but rather extends to all other methods and applications having the same functionality.
Claims (10)
1. A lightweight concrete, wherein the lightweight concrete comprises:
the coarse lightweight aggregate is 100 percent of sludge ceramsite;
the fine aggregate is 100% of construction waste reclaimed sand;
cement;
fly ash; and
building garbage regeneration powder.
2. The lightweight concrete according to claim 1, wherein the cement is p.o42.5 cement.
3. The lightweight concrete according to claim 1 or 2, wherein the fly ash is class II fly ash.
4. The lightweight concrete according to any one of claims 1 to 3, wherein the construction waste recycled powder is 300-500m formed by mixing recycled waste brick micro powder and recycled waste concrete micro powder2The specific surface area of the regenerated mixed micro powder is/kg.
5. The lightweight concrete according to any one of claims 1 to 4, wherein the construction waste reclaimed sand is reclaimed waste brick sand and reclaimed waste concrete sand in a mass ratio of 2:8 to 8: 2.
6. The lightweight concrete according to any one of claims 1 to 5, wherein the sludge ceramsite has a particle size of 5 to 16mm and a bulk volume weight of 400 kg/m and 800kg/m35-10% of water absorption and 1-5% of crushing index.
7. The lightweight concrete according to any one of claims 1 to 6, further comprising an additive which is a polycarboxylic acid water reducing agent.
8. The lightweight concrete according to any one of claims 1 to 7, wherein the slump test is 140 ± 20mm when the concrete is left to stand for 30 minutes; the slump test is 120 + -20 mm after standing for 60 minutes.
9. The lightweight concrete according to claim 7 or 8, wherein the weight ratio of cement between the raw material components is cement: sludge ceramsite: reclaimed sand: fly ash and reclaimed powder: additive: water 1: 1-2: 4-5: 0.5-0.8:0.6-0.8: 0.03-0.05: 1.1-1.3.
10. A lightweight concrete manufacturing method according to any one of claims 1 to 9, comprising:
weighing raw materials according to a mixing ratio;
soaking the weighed sludge ceramsite in water for 1 hour, and filtering clear water to perform pre-wetting treatment;
and pre-mixing the pre-wetted sludge ceramsite, the reclaimed sand, the reclaimed powder, the fly ash and the cement, adding water and an additive, and continuously stirring to finally obtain the concrete.
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Cited By (3)
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| CN113354342A (en) * | 2021-05-24 | 2021-09-07 | 金华职业技术学院 | Regenerated micropowder concrete and preparation method thereof |
| CN115387503A (en) * | 2022-09-28 | 2022-11-25 | 石河子大学 | Assembled EPS module bin-divided pouring self-compacting concrete wall structure, self-compacting concrete material and wall construction method |
| CN115784685A (en) * | 2022-11-18 | 2023-03-14 | 湖南工程学院 | Recycled lightweight aggregate concrete and preparation process thereof |
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| CN115387503A (en) * | 2022-09-28 | 2022-11-25 | 石河子大学 | Assembled EPS module bin-divided pouring self-compacting concrete wall structure, self-compacting concrete material and wall construction method |
| CN115784685A (en) * | 2022-11-18 | 2023-03-14 | 湖南工程学院 | Recycled lightweight aggregate concrete and preparation process thereof |
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