AU2020103163A4 - A Fully Recycled Concrete Wave-proof Block Using Large-particle-size Recycled Coarse Aggregate and Recycled Powder and Preparation Method Thereof - Google Patents
A Fully Recycled Concrete Wave-proof Block Using Large-particle-size Recycled Coarse Aggregate and Recycled Powder and Preparation Method Thereof Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 109
- 239000000843 powder Substances 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 63
- 239000004568 cement Substances 0.000 claims abstract description 21
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims description 20
- 239000002245 particle Substances 0.000 claims description 18
- 239000011398 Portland cement Substances 0.000 claims description 14
- 239000004576 sand Substances 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 6
- 239000004575 stone Substances 0.000 claims description 5
- 238000009736 wetting Methods 0.000 claims description 5
- 239000008399 tap water Substances 0.000 claims description 4
- 235000020679 tap water Nutrition 0.000 claims description 4
- 239000002699 waste material Substances 0.000 abstract description 18
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 11
- 238000002156 mixing Methods 0.000 description 9
- 238000013461 design Methods 0.000 description 8
- 229920006395 saturated elastomer Polymers 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000003628 erosive effect Effects 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 230000000979 retarding effect Effects 0.000 description 3
- 210000001015 abdomen Anatomy 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
- E02B3/14—Preformed blocks or slabs for forming essentially continuous surfaces; Arrangements thereof
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/24—Sea water resistance
-
- 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
- C04B2111/74—Underwater applications
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/16—Sulfur-containing compounds
- C04B24/20—Sulfonated aromatic compounds
- C04B24/22—Condensation or polymerisation products thereof
- C04B24/226—Sulfonated naphtalene-formaldehyde condensation products
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Civil Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Revetment (AREA)
Abstract
The invention belongs to the technical field of civil engineering materials, and relates to
a fully recycled concrete wave-proof block using large-particle-size recycled coarse aggregate
and recycled powder and a preparation method thereof. The invention provides a fully recycled
concrete wave-proof block using large-particle-size recycled coarse aggregate and recycled
powder, which comprises the following components in parts by weight: 1 part of cement, 0.5
3.0 parts of recycled coarse aggregate, 2-4 parts of natural coarse aggregate, 1.0-3.5 parts of
natural fine aggregate, 0.001-0.020 part of water reducing agent and 0.3-0.8 part of proper
amount of water. The invention further provides a preparation method and an application of
the fully recycled concrete wave-proof block using large-particle-size recycled coarse
aggregate and recycled powder. According to the fully recycled concrete wave-proof block
using large-particle-size recycled coarse aggregate and recycled powder and the preparation
method thereof, the large-grain-size recycled coarse aggregate is utilized, so that the fully
recycled concrete wave-proof block using large-particle-size recycled coarse aggregate and
recycled powder has the obvious advantages of low production cost and high waste utilization
rate, the consumption of natural coarse aggregate can be saved, the disposal cost and energy
consumption of waste concrete can be reduced, and the fully recycled concrete wave-proof
block using large-particle-size recycled coarse aggregate and recycled powder is simple in
process, good in stress performance and environment-friendly.
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Figure 1
Description
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Figure 1
A Fully Recycled Concrete Wave-proof Block Using Large-particle-size Recycled
Coarse Aggregate and Recycled Powder and Preparation Method Thereof
[01] The invention belongs to the technical field of civil engineering materials, and relates to a fully recycled concrete wave-proof block using large-particle-size recycled coarse aggregate and recycled powder and a preparation method thereof.
[02] The aggregate formed by crushing, cleaning and grading the waste concrete is called recycled coarse aggregate; the recycled coarse aggregate partially or completely replaces natural aggregate such as sand and stone to prepare the concrete into recycled concrete; the recycled concrete is used as a novel green environment friendly building material, so that the requirement of the construction industry on natural resources is reduced; and the recycled coarse aggregate concrete can be effectively utilized to meet the requirement of sustainable development of the construction industry. However, in the prior art, fine treatment and deep crushing processes are adopted in the production of the recycled coarse aggregate, the recycled fine aggregate with the particle size of 0-4.75mm and the recycled coarse aggregate with the particle size of 5-31.5mm are produced, and the deep resource treatment process often needs more energy consumption and more expensive matched process equipment, so that the resource treatment cost is increased, and the popularization and application of the recycled concrete products are limited.
[03] In our country, the coastline is wide and long, and the coastline is active under the combined action of waves and tidal current. It is often deposited in the harbor channel and berth. At the same time, the erosion of the coastline embankment will be aggravated by the erosion of the sea waves, which poses a great threat to the safety of the embankment. Therefore, the construction of the breakwater in the area where the sea waves are seriously eroded or the coastline is active can prevent the silting of harbor basin and wave erosion of the coastline. Considering the characteristics of the block and the particularity of its service environment, how to save the amount of natural coarse aggregate and find an effective and feasible application way for abandoned concrete on the premise of not affecting the mechanical property, durability and overall performance of the block is worthy of further study and discussion.
[04] In view of the disadvantages of the above prior art, considering the characteristics of large volume, low strength requirement, large concrete demand and the like for the concrete wave-proof blocks, the invention aims to provide the wave proof block with low production cost, high waste utilization rate, simple process, good stress performance and environmental protection and a preparation method thereof.
[05] The technical problem to be solved by the present invention is: how to provide a wave-proof block with unique structure, low production cost, high waste utilization rate, that is, the replacement rate of recycled aggregate to natural aggregate can reach 60%, and good stress performance, and to provide a preparation method of the large-particle-size recycled coarse aggregate concrete wave-proof block.
[06] The present invention achieves the above object by adopting the following technical solution:
[07] The first aspect of the present invention provides a formula of a fully recycled concrete wave-proof block using large-particle-size recycled coarse aggregate and recycled powder, which comprises the following components in parts by weight:
[08] 1 part of cement;
0.5-3.0 parts of recycled coarse aggregate;
2-4 parts of natural coarse aggregate;
[09] 1.0-3.5 portions of natural fine aggregate;
0.001-0.020 part of water reducing agent;
0.3-0.8 part of proper amount of water;
[010] After the components are measured and mixed, the mixture is stirred, and the mixture is poured and molded according to the design size of the wave-proof block, so that the required fully recycled concrete wave-proof block using large-particle-size recycled coarse aggregate and recycled powder can be prepared.
[011] Preferably, the cement is selected from any one of Portland cement or ordinary Portland cement. The ordinary Portland cement is prepared by adding 6 percent-20 percent of mixed material into Portland cement clinker and grinding a proper amount of gypsum. Because the mixed materials are less, and the components of the mixed materials are closer to the Portland cement, the properties of the mixed materials and the Portland cement are closer to each other, and the mixed materials and the Portland cement can be replaced under certain conditions, such as concrete requiring quick hardening and high strength, Portland cement is preferably adopted generally, common Portland cement can also be adopted, and the application range of the common Portland cement is wider.
[012] Preferably, the strength grade of the cement is more than or equal to 32.5 grade.
[013] Preferably, the natural coarse aggregate is crushed stone having a particle size of 5-25 mm.
[014] Preferably, the natural fine aggregate is medium sand.
[015] More preferably, the middle sand is river sand with a grain diameter in a region 2, the fineness modulus is 2.3-3.0, the average grain diameter is 0.35-0.5mm, the mud content is 0.8-1.0%, and the mud block content is 0.1-0.3%.
[016] Preferably, the water reducing agent is an SBTJM-10(retarding, pumping) water reducing agent. For example, the SBTJM-10(retarding, pumping) water reducing agent may be a water reducing agent produced by Jiangsu Subot New Materials Co., Ltd.
[017] Preferably, the appropriate amount of water is tap water.
[018] Preferably, the recycled coarse aggregate is a large-particle-size recycled coarse aggregate, and the particle diameter of the large-particle-size recycled coarse aggregate is 31.5-100mm. And the recycled coarse aggregate is a waste concrete block which is prepared by removing impurities such as wood, glass, iron products and the like after the waste concrete is crushed. The large-particle-size recycled coarse aggregate is a waste concrete block which is used for crushing waste concrete into a particle size of 31.5-100. Compared with the recycled coarse aggregate with small particle size, the large-particle-size recycled coarse aggregate does not need to be further crushed, and has the obvious advantages of low production cost and high waste utilization rate; and meanwhile, compared with the recycled coarse aggregate with small particle diameter, the large-particle-size recycled coarse aggregate has more old mortar attached, and one recycled coarse aggregate can be regarded as a small-volume concrete.
[019] More preferably, the large-particle-size recycled aggregate has a particle size of 31.5-80 mm.
[020] Further preferably, the large-particle-size recycled aggregate comprises two particle size sections of 31.5-40mm and 40-80mm, wherein the weight ratio of the particle size section of 31.5-40mm to the particle size section of 40-80mm is 50: 50:
[021] Preferably, additional water is added to the recycled coarse aggregate for wet water treatment to achieve a saturated surface dry state.
[022] More preferably, the added weight of the additional water is 2-3 wt% of the weight of the recycled coarse aggregate.
[023] More preferably, the additional water is tap water.
[024] Preferably, the recycled powder has a particle size of 0-0.075mm
[025] Preferably, the fully recycled concrete wave-proof block using large particle-size recycled coarse aggregate and recycled powder comprises the following components in parts by weight:
[026] 1 part of cement;
0.1-0.3 part of recycled powder;
1-2 parts of recycled coarse aggregate;
2-4 parts of natural coarse aggregate;
1.2-2 portions of natural fine aggregate;
0.001-0.020 part of water reducing agent;
0.4-0.7 part of proper amount of water;
[027] More preferably, the fully recycled concrete wave-proof block using large particle-size recycled coarse aggregate and recycled powder comprises the following components in parts by weight:
[028] 1 part of cement;
0.15-0.20 part of recycled powder;
1.2-1.8 parts of recycled coarse aggregate;
2-2.5 parts of natural coarse aggregate;
1.5-1.8 portions of natural fine aggregate;
0.005-0.015 part of water reducing agent;
0.4-0.6 part of proper amount of water;
[029] The second aspect of the invention provides a preparation method of a fully recycled concrete wave-proof block using large-particle-size recycled coarse aggregate and recycled powder, which specifically comprises the following steps:
[030] 1) After additional water is added into the recycled coarse aggregate for wet water treatment, the recycled coarse aggregate is put into a stirrer according to the parts by weight in the formula, and perform the first mixing;
[031] Preferably, the wet water treatment has a wetting time of more than or equal to 20 minutes. The wet water treatment enables the recycled coarse aggregate to reach a saturated surface dry state.
[032] More preferably, the added weight of the additional water is 2-3 wt% of the weight of the recycled coarse aggregate.
[033] 2) the cement, the natural coarse aggregate and the natural fine aggregate are weighed according to the parts by weight in the formula and put into a stirrer to be stirred, and then the proper amount of water and the water reducing agent are weighed according to the parts by weight in the formula and put into the stirrer, then perform the second mixing;
[034] Preferably, the cement, the natural coarse aggregate and the natural fine aggregate are put into a stirrer and stirred for 1 to 3 minutes. More preferably, the cement, the natural coarse aggregate and the natural fine aggregate are put into a mixer to be stirred for 2 minutes.
[035] Preferably, the stirring time after the proper amount of water and the water reducing agent are added is more than or equal to 2 minutes. More preferably, the stirring time after addition of the appropriate amount of water and the water reducing agent is 2 minutes.
[036] Preferably, the slump of the mixture is 100-200 mm.
[037] Preferably, the blender is a conventionally used blender.
[038] And 3) pouring the mixture obtained in the step 2), demoulding after forming, and curing to obtain the required concrete wave-proof block.
[039] Preferably, the forming mode is machine vibration forming.
[040] More preferably, the vibration apparatus used for the vibration forming of the machine is a common concrete vibration table.
[041] More preferably, the frequency of the vibration apparatus used for the vibration forming of the machine is a conventional vibration frequency.
[042] Preferably, the curing is natural curing.
[043] More preferably, the curing conditions of the natural curing are that the curing temperature is not less than 5 degree. C., the curing humidity (relative humidity) is not less than 60%, and the curing time is not less than 14 days.
[044] It is further preferable that the curing is standard, and the curing conditions are that the curing temperature is 20±2°C, the curing humidity (relative humidity) is >=95%, and the curing time is 28 days.
[045] Preferably, the large-particle-size recycled aggregate concrete wave-proof block has the same specification and size as the common concrete wave-proof block. The large-particle-size recycled aggregate concrete wave-proof block has various different specifications and sizes, and can meet the design requirements of different types of wave-proof blocks.
[046] More preferably, the large-particle-size recycled aggregate concrete wave proof block is a twisted I-shaped wave-proof block.
[047] Further preferably, the technical requirements of the twisted I-shaped wave block are as follows: a=c; b=(1/4-1/2) a; d=e/2; and f=(1/2-1) a.
[048] Still more preferably, said a=1-2 m. Most preferably, said a=1.5 m.
[049] According to the third aspect of the present invention, there is provided an application of a fully recycled concrete wave-proof block using large-particle-size recycled coarse aggregate and recycled powder in hydraulic engineering, offshore engineering, and coastal dams, wherein the concrete wave-proof block is mainly placed on a coastal area or a river bank to reduce the damage of the bank under the erosion of sea waves or water waves and prolong the service life of the bank.
[050] According to the fully recycled concrete wave-proof block using large particle-size recycled coarse aggregate and recycled powder and the preparation method thereof, the recycled concrete wave-proof block is prepared by using the large particle-size recycled coarse aggregate as the concrete coarse aggregate; and compared with the common concrete wave-proof block, the fully recycled concrete wave-proof block using large-particle-size recycled coarse aggregate and recycled powder has the obvious advantages of low production cost and high waste utilization rate, and can be used for solving the problem of consumption of natural coarse aggregate in coastal engineering. Considering the characteristics of the wave-proof block and the particularity of the service environment, the fully recycled concrete wave-proof block using large-particle-size recycled coarse aggregate and recycled powder is prepared by using the large-particle-size recycled coarse aggregate as the concrete coarse aggregate, so that the wave-proof block can meet the design standard of related performance; and on the premise of not influencing the mechanical property, the durability and the overall performance of the wave-proof block, the dosage of the natural coarse aggregate can be saved, the disposal cost and the energy consumption of the waste concrete are reduced, and an effective and feasible application way is provided for the comprehensive utilization of the large-particle-size recycled concrete aggregate, which has wave-proof and adsorption effects. Meanwhile, the fully recycled concrete wave-proof block using large-particle-size recycled coarse aggregate and recycled powder and the preparation method thereof have the advantages of simple process, good stress performance and environmental protection.
[051] Figure 1 is a schematic diagram showing a three-dimensional structure of a twisted I-shaped wave-proof block in a fully recycled concrete wave-proof block using large-particle-size recycled coarse aggregate and recycled powder, wherein 1 is a twisted I-shaped upper structure; 2 is a twisted I-shaped middle structure; 3 is a twisted I-shaped lower structure; a is a main side length; b is a width; c is a height; d is a flange height; e is a belly height; and f is a secondary side length.
[052] Figure 2 shows a schematic plan view of a twisted I-shaped wave-proof block in a fully recycled concrete wave-proof block using large-particle-size recycled coarse aggregate and recycled powder according to the present invention, wherein a is the length of a main side and f is the length of a secondary side.
[053] Figure 3 is a schematic diagram showing a use structure of a twisted I shaped wave-proof block in a fully recycled concrete wave-proof block using large particle-size recycled coarse aggregate and recycled powder according to the present invention.
[054] The invention is further illustrated below with reference to specific embodiments, which are to be understood as merely illustrative of the invention and not as limiting the scope of the invention.
[055] Other advantages and effects of the present invention will become readily apparent to those skilled in the art from the following detailed description when taken in conjunction with the accompanying drawings. The present invention may be practiced or applied by other specific embodiments, and various modifications or changes may be made in the details of the present invention based on various views and applications without departing from the spirit of the invention.
[056] The raw materials and the mixing ratio used in the following embodiments were designed as follows:
[057] 1. Raw material components in the formula
[058] 1.1 Recycled Coarse Aggregate
[059] The recycled coarse aggregate adopted by the invention has larger grain diameter, only needs one crushing process, and the waste concrete with the grain diameter of 31.5-100mm is obtained by screening as the large-particle-sizeaggregate, and the grain diameter is preferably 31.5-80mm. Further, according to the DingerFunk equation, it was determined that the weight ratio of the large-particle-size recycled coarse aggregate in the two particle-size sections of 31.5-40 mm and 40-80 mm was : 50. The main physical and mechanical properties are shown in Table 1.
[060] Table 1 Physical and Mechanical Properties of Large-particle-size Recycled Coarse Aggregate
[061]
Crushing Index (%) Water content (%) Water absorption Density (kg/m')
2520 19.89 1.1-1.2 3.35-4.18
[062] wherein, because the particle size of the recycled coarse aggregate adopted by the invention is large, and has the characteristic of large water absorption capacity, the recycled coarse aggregate needs to be subjected to wet water treatment before mixing, so that the recycled coarse aggregate reaches a saturated surface dry state. The added weight of the additional water is 2-3wt% of the weight of the recycled coarse aggregate. After three times of watering and pre-wetting, the waste concrete blocks can approach 96% of the water absorption rate of the recycled coarse aggregate when being soaked for 1h, so that the large-particle-size recycled coarse aggregate is considered to reach the saturated surface dry state. After screening, the waste concrete with a diameter of less than 31.5mm can be used to produce common recycled coarse aggregate. This method can reduce the production cost of recycled coarse aggregate by 1/4 compared with common methods.
[063] 1.2 Cement: P. 0. 42.5 Portland cement or Portland cement.
[064] 1.3 Natural coarse aggregate: 5-25mm crushed stone is selected, which accords with the standard of constructionpebble and crushed stone(GB/T14685-2011).
[065] 1.4 Natural fine aggregate: the middle sand in area 2 contains 0.9% of mud and 0.2% of mud, which accords with the middle sand standard of Building Sand(GB/T14685-2001).
[066] 1.5 Appropriate amounts of water and additional water: both are tap water.
[067] 1.6 water reducing agent: SBTJM-10(retarding, pumping) water reducing agent.
[068] 2. Mix Ratio Design
[069] The design of the mixture ratio of the fully recycled concrete wave-proof block using large-particle-size recycled coarse aggregate and recycled powder adopts the following steps: firstly, designing the mixture ratio when the recycled coarse aggregate is zero-doped; and secondly, adjusting the original mixture ratio by selecting different recycled coarse aggregate doping ratios of the large-particle-size to obtain the final mixture ratio.
[070] 3.1 Design of Mixture Ratio for Large-particle-size Recycled Coarse Aggregatewith Zero Admixture Rate
[071] It is determined according to General Concrete Mix Ratio Design Specification (JGJ55-2011).
[072] 3.2 Mix Ratio Adjustment of Large-particle-size Recycled Coarse Aggregate
[073] The mixing ratio of the large-particle-size recycled coarse aggregate is the weight percentage of the large-particle-size recycled coarse aggregate instead of common concrete (the common concrete is mixed according to the proportion of the common concrete instead of cement, sand, natural aggregate and other components). the weight of the mixed concrete is calculated according to the mixing ratio of the large particle-size recycled coarse aggregate when the mixing ratio is zero, and then the recycled coarse aggregate is added into the freshly mixed concrete according to the set weight percentage to replace the original concrete. The weight of each component is calculated according to the following formula.
[074] m,=(m°+m°+ +m°(1)
[075] meni = m1-a) (2)
[076] mg = m°(1-a) (3)
[077] mS = ms(1-a) (4)
[078] m,=m°(1-a) (5)
[079] In the formula, a-the mixing ratio of the large-particle-size recycled coarse aggregate;
[080] Ma-adjusting the dosage (kg/m 3) of cement slurry per cubic meter of concrete before adjustment;
[081] Mga-the amount of coarse aggregate (kg/m 3) per cubic meter of concrete before adjustment;
[082] Msa-adjusting the amount of fine aggregate (kg/m 3) per cubic meter of concrete before adjustment;
[083] Mw-adjusting the appropriate amount of water per cubic meter of concrete (kg/m 3) before adjustment;
[084] Mc-the amount of cement slurry (kg/m 3) per cubic meter of concrete after adjustment;
[085] Mg-the amount of coarse aggregate (kg/m 3) per cubic meter of concrete after adjustment;
[086] Ms-the amount of fine aggregate (kg/m 3) per cubic meter of concrete after adjustment;
[087] Mw-the appropriate amount of water per cubic meter of concrete after adjustment (kg/m3 );
[088] Mr-the amount of large-particle-size recycled coarse aggregate per cubic meter (kg/m3 ).
[089] Embodiment 1- Embodiment 4
[090] 1. Experimental Methods
[091] Removing impurities such as wood, glass, iron products and the like in the waste concrete, and crushing the waste concrete to a particle size of 31.5-80mm as the large-particle-size recycled coarse aggregate. And stacking the large-particle-size recycled coarse aggregate before mixing, wetting the large-particle-size recycled coarse aggregate by using additional water according to the measured water content, wherein the wetting time is not less than 20 minutes, so that the large-particle-size recycled coarse aggregate is in a saturated surface dry state. And the weight of the additional water is 2-3wt% of the weight of the large-particle-size recycled coarse aggregate. Adding the large-particle-size recycled coarse aggregate, the natural coarse aggregate, the cement and the natural fine aggregate which are subjected to saturated surface dry treatment into a stirrer according to parts by weight, stirring for 1-3 minutes, then adding a proper amount of water and a water reducing agent according to parts by weight, stirring for not less than 2 minutes, vibrating and molding the obtained mixture, demoulding after molding, and naturally curing to obtain the large-particle-size recycled concrete wave-proof block.
[092] The forming mode is the machine vibration forming, the vibration equipment used is the common concrete vibration table, the frequency of the vibration equipment used is the conventional vibration frequency. The natural curing condition is that the curing temperature is not less than 5°C, the curing humidity (relative humidity) is not less than 60%, and the curing time is not less than 14 days. The preferable curing state is that the formed wave-proof block is cured in the environment with the temperature of18-22°C, and the relative humidity of more than 95%, the curing time is 28 days, then the wave-proof block can be used for hydraulic engineering a offshore engineering is obtained. The large-particle-size recycled aggregate concrete wave-proof block is a twisted I-shaped wave-proof block. The technical requirements of the twisted I-shaped wave block are as follows: a=c; b=(1/4-1/2) a; d=e/2; and f=(1/2 1) a. As shown in figure 1, wherein a is a main side length; b is a width; c is a height; d is a flange height; e is a belly height; and f is a secondary side length.
[093] The original concrete strength of the large-particle-size recycled coarse aggregate used in Embodiments 1 and 2 was C30, and the strength of the ready-mixed large-particle-size recycled coarse aggregate concrete was C30; and the original concrete strength of the large-particle-size recycled coarse aggregate used in Embodiments 3 and 4 was C40, and the strength of the ready-mixed large-particle-size recycled coarse aggregate concrete was C40. In Embodiments 1 to 4, the components and compositions of fully recycled concrete wave-proof blocks using large-particle-size recycled coarse aggregate and recycled powder prepared by the above experimental method were shown in Table 2, wherein the total amount of the large-particle-size recycled coarse aggregate was about 20% to 30% of the mass of the concrete. The mix ratio of common concrete wave block (control group) was shown in Table 3, wherein the strength grade is C30 in comparative Embodiments 1, and the strength grade is C40 in comparative Embodiment 2. The large-particle-size recycled concrete wave blocks in Embodiments 1 to 4 have the same specification with the common concrete wave proof blocks in the comparative Embodiments 1-2. [0092] Table 2 Formula Table for Large-Particle-Size Recycled Aggregate Concrete Wave-Proof Block
[094]
Formulation Component Embodiment1 Embodiment 2 Embodiment 3 Embodiment 4 Name Cement 1.0 part 1.0 part 1.0 part 1.0 part Recycled powder 0.15 part 0.15 part 0.15 part 0.15 part Large-particle-size 1.2 parts 1.8 parts 1.2 parts 1.8 parts recycled coarse aggregate Natural coarse aggregate 2.5 parts 2.5 parts 2.0 parts 2.0 parts Natural fine aggregate 1.9 parts 1.9 parts 1.8 parts 1.8 parts Proper amount of water 0.6 part 0.6 part 0.5 part 0.5 part Water reducing agent 0.002 part 0.002 part 0.005 part 0.005 part
[095] [0094] Table 3 Formula Table for Common Concrete Wave-Proof Block in Comparative Embodiments 1-2
[096]
Control concrete formulation component Comparative Comparative name Embodiment 1 Embodiment 2 Cement 1.0 part 1.0 part Natural coarse aggregate 3.7 parts 3.8 parts Natural fine aggregate 1.9 parts 1.8 parts Water 0.6 part 0.5 part Water reducing agent 0.002 part 0.005 part
[097] 2. Performance Test
[098] The performance of the concrete wave-proof blocks prepared according to the proportions shown in Tables 2 to 3 in Embodiments 1 to 4 were tested in accordance with the Hydraulic Concrete Ratio Design Specification (DL/T 5330-2005) respectively, and the results are shown in Table 4.
[099] Table 4 Embodiments 1-4 and comparative embodiments 1-2 prepared wave block energy test results
[0100]
Test items Compressive strength (MPa)
Embodiment 1 26.43 Embodiment 2 26.87 Embodiment 3 34.83 Embodiment 4 33.37 Comparative Embodiment 1 25.76 Comparative Embodiment 2 33.25
[0101] As can be seen from Table 4, the compressive strength of Embodiments 1 and 2 is very close, the compressive strength of Embodiments 3 and 4 is also very close, and the strength of the concrete in Comparative Embodiments 1-2 is not obviously reduced. Under the two strength grades of C30 and C40, the trend line slope of the change of the compressive strength grade under the condition of different large-particle size recycled coarse aggregate doping rates is less than 5%, which indicates that the compressive strength of the large-particle-size recycled coarse aggregate is less influenced by the doping rates. The fully recycled concrete wave-proof blocks using large-particle-size recycled coarse aggregate and recycled powder obtained in the above Embodiments 1-4 all have higher compressive strength, and the performance of the fully recycled concrete wave-proof blocks using large-particle-size recycled coarse aggregate and recycled powder is better than that of the ordinary concrete wave blocks obtained in the comparative Embodiments 1-2, and can be applied in the actual river slope protection.
[0102] In summary, the fully recycled concrete wave-proof block using large particle-size recycled coarse aggregate and recycled powder disclosed by the invention not only can effectively save natural resources, but also can effectively solve the environmental problem caused by stacking construction wastes, and has the advantages of low production cost, good stress performance, high construction speed, environmental protection, environmental friendliness and the like. Therefore, the invention effectively overcomes the shortcomings of the existing technology and has a high industrial utilization value.
[0103] Although the invention has been described with reference to specific examples, it will be appreciated by those skilled in the art that the invention may be embodied in many other forms, in keeping with the broad principles and the spirit of the invention described herein.
[0104] The present invention and the described embodiments specifically include the best method known to the applicant of performing the invention. The present invention and the described preferred embodiments specifically include at least one feature that is industrially applicable
Claims (10)
1. A concrete wave-proof block comprising the following components in parts by weight:
1 part of cement;
0.1-0.3 part of recycled powder
0.5-3.0 parts of recycled coarse aggregate;
2-4 parts of natural coarse aggregate;
1.0-3.5 portions of natural fine aggregate;
0.001-0.020 part of water reducing agent;
0.3-0.8 part of proper amount of water;
2. The concrete wave-proof block according to claim 1, wherein the cement is selected from any one of Portland cement or ordinary Portland cement, and the strength grade of the cement is more than or equal to 32.5 grade.
3. The concrete wave-proof block according to claim 1, wherein the natural coarse aggregate is crushed stone with the particle size of 5-25mm, and the natural fine aggregate is medium sand.
4. The concrete wave-proof block according to claim 1, wherein the water reducing agent is SBTJM-10 water reducing agent, and the appropriate amount of water is tap water.
5. The concrete wave-proof block according to claim 1, wherein the recycled coarse aggregate is large-particle-size recycled coarse aggregate, and the particle size of the large-particle-size recycled coarse aggregate is 31.5-100mm.
The concrete wave-proof block according to claim 1, wherein the recycled powder is recycled concrete powder, and the particle size of recycled concrete powder is 0-0.075mm
6. The preparation method of the concrete wave-proof block according to any one of claims 1-5, which specifically comprises the following steps:
1) Adding additional water into the regenerated coarse aggregate for wet water treatment, and putting the regenerated coarse aggregate into a stirrer according to the parts by weight in the formula;
2) The cement, the natural coarse aggregate and the natural fine aggregate are weighed according to the parts by weight in the formula and put into a stirrer to be stirred, and then a proper amount of water and water reducing agent are weighed according to the parts by weight in the formula and put into the stirrer to be uniformly stirred to obtain a mixture;
3) And pouring the mixture obtained in the step 2), demoulding after forming, and curing to obtain the required concrete wave-proof block.
7. The method for preparing a concrete wave-proof block according to claim 6, wherein in the step 1), the added weight of the additional water is 2-3 wt% of the weight of the recycled coarse aggregate; and the wetting time of the wet water treatment is more than or equal to 20 minutes.
8. T he method for preparing a concrete wave-proof block according to claim 6, wherein in step 2), the method comprises any one or more of the following conditions:
Al) putting the cement, the natural coarse aggregate and the natural fine aggregate into A stirrer, and stirring for 1-3 minutes;
A2) stirring for more than or equal to 2 minutes after putting a proper amount of water and a water reducing agent;
A3) the slump of the mixture is 100-200mm.
9. The preparation method of the concrete wave-proof block according to claim 6, which is characterized in that the forming mode is machine vibration forming; and the curing mode is natural curing in the step 3).
10. The use of a concrete wave block in hydraulic engineering, offshore engineering, and coastal dams is according to any one of claims 1-5.
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