Construction method of low-cement fully-regenerated rock-fill concrete
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A construction method and regenerative pile technology, applied in the field of building materials, can solve the problems of large amount of land occupation and processing costs, occupation of land resources, etc., and achieve the effects of saving labor and machine costs, reducing cement consumption, and being environmentally friendly
Inactive Publication Date: 2019-12-03
TSINGHUA UNIV +1
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The annual demand for concrete in my country has reached 1.3 billion to 1.4 billion cubic meters. Howev
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[0049] Example 1
[0050] A pure pulp, including the following components by mass:
[0052] The preparation method of pure pulp is as follows:
[0053] In the pure slurry mixer, under normal temperature conditions, add 232.5g of cement and 427.9g of regenerated fine powder, and start mixing according to the machine program. In 5 seconds, add 247.9g of water and 2.65g of additives. The admixture is uniformly dissolved in water in advance. The pure slurry mixture is obtained and tested. Test items and data are shown in Table 1.
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[0054] Example 2
[0055] A pure pulp, including the following components by mass:
[0056] Water 204g, cement 273.5g, recycled fine powder 503.4g, admixture 2g.
[0057] The preparation method of pure pulp is as follows:
[0058] In the pure slurry mixer, under normal temperature conditions, add 273.5 cement, 503.4gg regenerated fine powder, start mixing according to the machine program, add 204g water and 2g additives in 5 seconds. The admixture is uniformly dissolved in water in advance. The pure slurry mixture is obtained and tested. Test items and data are shown in Table 1.
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[0059] Example 3
[0060] A pure pulp, including the following components by mass:
[0061] Water 202.5g, cement 182.4g, regenerated fine powder 575.3g, admixture 4.17g, sodium gluconate 0.18g.
[0062] The preparation method of pure pulp is as follows:
[0063] In a pure slurry mixer, under normal temperature conditions, add 182.4g of cement and 575.3g of regenerated micropowder, and start mixing according to the machine program. In 5 seconds, add 202.5g of water, 4.17g of additives, and 0.18g of sodium gluconate. The admixture and sodium gluconate are uniformly dissolved in water in advance. The pure slurry mixture is obtained and tested. Test items and data are shown in Table 1.
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Abstract
The invention discloses a construction method of low-cement fully-regenerated rock-fill concrete. By crushing and screening building waste, regenerated rock-fill blocks, regenerated coarse aggregate,regenerated fine aggregate and regenerated micro powder are obtained. The regenerated coarse aggregate, the regenerated fine aggregate, the regenerated micro powder and cement are mixed, then water and other optional components are added for mixing, and thus a concrete mixture is obtained; and the regenerated rock-fill blocks with the particle size being greater than 150 mm are accumulated on thepre-pouring bin surface, the concrete mixture is poured into the bin surface, and the steps are repeated till engineering is completed. The regenerated micro powder fully replaces the cement, so thatthe use amount of the cement is decreased, and the engineering cost is saved. In the pouring process, insert-pounding is not needed, natural leveling and bespreading are conducted, and thus the laborand machine costs in the insert-pounding process are saved. In the treatment scheme of regenerated raw materials, waste concrete is fully utilized, the large-block waste concrete is utilized as the coarse aggregate, the small-block waste concrete is utilized as the fine aggregate, the fine powder is utilized as a filler, and thus the zero slag abandoning rate of the waste concrete is realized. Noadditional product is generated in the treatment process, and thus environmental friendliness is realized.
Description
technical field [0001] The invention relates to the field of building materials, in particular to a construction method for low-cement fully recycled rockfill concrete. Background technique [0002] Rockfill concrete refers to the process of naturally filling the surface of the warehouse with rocks (or pebbles) that meet certain particle size requirements, and then pouring self-compacting concrete that meets special requirements on the surface of the rockfill body, without vibrating and only relying on itself to fill the rockfill body. Voids form a complete and dense concrete. The proportion of rockfill can generally reach 50%-60%, which can make full use of primary mined stones or large stones in excavated materials, and minimize the consumption of cementitious materials. At the same time, the rockfill concrete construction technology also greatly saves energy in the construction links such as aggregate crushing, concrete production and pouring, and reduces carbon dioxide ...
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