High-volume solid waste concrete and preparation method thereof

A technology of waste concrete and large dosage, applied in the field of comprehensive utilization of solid waste and building materials, can solve the problems of low strength, low strength of recycled concrete, and many micro-cracks, so as to reduce production costs, increase the proportion of recycled aggregates, alleviate the extreme scarcity effect

Inactive Publication Date: 2021-02-09
SHANGHAI RES INST OF BUILDING SCI CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is the general trend to develop concrete with a large amount of solid waste (the amount of waste residue is not less than 70%). However, compared with natural aggregate, recycled aggregate has more micro-cracks and lower strength, and the strength of the prepared recycled concrete is generally lower than that of ordinary concrete. , so recycled concrete mostly has low strength

Method used

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  • High-volume solid waste concrete and preparation method thereof

Examples

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preparation example Construction

[0029] The preparation method of embodiment 1~embodiment 7 is:

[0030] (1) Take steel slag, fly ash, mineral powder by weight of composite admixture, add in mixing container, mix 5min to fully mix, make composite admixture;

[0031] (2) Weigh various raw materials according to the weight of C30 large-volume solid waste concrete, add tailings machine-made sand, regenerated fine aggregate, natural sand, composite admixture, cement in the order of feeding, stir for 30 seconds, and then add Reinforced recycled coarse aggregate for reticular methyl silicone waterproof membrane, stir for 30s to make the dry material mix evenly;

[0032] (3) Add part of water and admixture to the dry material, and stir for 1 minute to make the slurry on the surface of the aggregate evenly coated; then add the remaining water and admixture, and stir for 2 minutes to take out the mixer.

[0033] The strength and stability of the large-volume solid waste concrete provided in this example are greatly i...

Embodiment 1

[0036] per m 3 The concrete takes the following parts by weight:

[0037] P·O4 2.5 cement 181kg, composite admixture (steel slag: fly ash: mineral powder = 8:60:32) 182kg, tailings machine-made sand 351kg, natural sand 424kg, reinforced recycled coarse aggregate (regenerated coarse aggregate After soaking in water glass with a mass concentration of 3% and a modulus of 3.2 for 10 minutes), 1070kg, 3.63kg of polycarboxylate superplasticizer, and 182kg of water.

Embodiment 2

[0039] per m 3 The concrete takes the following parts by weight:

[0040] P·O4 2.5 cement 173kg, composite admixture (steel slag: fly ash: mineral powder = 50:10:40) 172kg, tailings machine-made sand 362kg, natural sand 420kg, reinforced recycled coarse aggregate (regenerated coarse aggregate After soaking in 1% potassium methyl silicate solution with a mass concentration of 5min), 1080kg, 3.11kg of polycarboxylate superplasticizer, and 176kg of water.

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Abstract

The invention discloses high-volume solid waste concrete and a preparation method thereof. The concrete comprises the following components in parts by weight: 173-187 parts of cement, 172-187 parts ofa composite admixture, 0-362 parts of machine-made sand of tailings, 400-424 parts of natural sand, 0-313 parts of recycled fine aggregate, 1063-1080 parts of reinforced recycled coarse aggregate, 0-3.63 parts of a polycarboxylate superplasticizer and 159-243 parts of water. The 28-d strength of the high-volume solid waste concrete reaches 36 MPa or above, the durability of the concrete is good,and the proportion of recycled aggregate in the recycled concrete is increased; and solid waste such as construction waste is utilized on a large scale, the resource utilization level of the construction waste is improved, and the current situation that natural sandstone aggregate is extremely short at present is relieved.

Description

technical field [0001] The invention belongs to the technical field of solid waste comprehensive utilization and building materials, and in particular relates to a large-volume solid waste concrete and a preparation method thereof. Background technique [0002] With the rapid development of my country's economy and the increasing number of reconstruction and expansion projects, the amount of construction waste generated has increased rapidly in recent years. Limited by the current technical level, if the amount of solid waste in the product is greatly increased, the performance and stability of the product will be seriously affected, which in turn will affect the production of the enterprise. [0003] Since 2016, the supply of natural sand and gravel aggregates has been in short supply, and the price has risen significantly. If we can increase the amount of construction waste in concrete, it will not only solve the problem of the source of concrete sand and gravel raw materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/27C04B111/90
CPCC04B28/04C04B2201/50C04B2111/00017C04B2111/90C04B2111/27C04B18/142C04B18/141C04B18/08C04B18/12C04B14/06C04B22/00C04B18/16C04B2103/302C04B24/42
Inventor 钱耀丽杨利香夏月辉陆美荣韩云婷李阳
Owner SHANGHAI RES INST OF BUILDING SCI CO LTD
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