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Low-carbon concrete and cementing material

A cementitious material and concrete technology, applied in the field of concrete, can solve the problems of reducing the carbon emission of concrete, difficult to guarantee the mechanical properties of concrete, and reducing the amount of cement, so as to reduce carbon emission, improve durability, improve water absorption and crushing. effect of value

Pending Publication Date: 2022-08-02
中建西部建设北方有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to reduce the carbon emission of concrete and solve the technical problem that it is difficult to guarantee the mechanical properties of concrete due to the reduction of cement consumption, the invention provides a low-carbon concrete and cementitious material

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0030] Embodiment 1: a kind of low carbon concrete, its proportion is as shown in table 1, and its preparation method is as follows:

[0031] 1) According to the formula of Example 1 in Table 1, weigh the required cement, first-grade fly ash, mineral powder, common sand, common stone, admixture and water.

[0032] 2) Rinse the mixer before mixing, and pre-mix a small amount of the same concrete mixture. After the inner wall of the mixer is hung with slurry, the remaining material is discharged.

[0033] 2) Put the weighed ordinary sand and ordinary stone in the mixer and stir, then add the weighed cement, first-grade fly ash and mineral powder into the mixer, turn on the mixer, and then add water and polycarboxylate water reducing agent. Add it to the mixer and mix for at least 2 minutes until it is evenly mixed, and then take out the machine to obtain a concrete mixture.

[0034] The slump test, slump loss over time test, expansion degree test and expansion degree loss over ...

Embodiment 2

[0064] Embodiment 2: a kind of low carbon concrete, its proportion is shown in table 1, and its preparation method is the same as embodiment 1.

[0065] The slump / expansion test and the compressive strength test of 7d, 28d, and 60d were carried out on the concrete of Example 2 using the same test method as in Example 1. The test results are shown in Table 2.

Embodiment 3

[0073] Embodiment 3: a kind of low carbon concrete, its proportion is shown in table 3, and its preparation method is the same as embodiment 1.

[0074] The slump / expansion test and the compressive strength test of 7d, 28d, and 60d were carried out on the concrete of Example 3 using the same test method as in Example 1. The test results are shown in Table 4.

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Abstract

The invention relates to the field of concrete, in particular to low-carbon concrete and a cementing material. In order to reduce the carbon emission of concrete and solve the technical problem that the mechanical property of the concrete is difficult to guarantee due to the reduction of the cement consumption, the invention provides low-carbon concrete which comprises the following components in parts by weight: 340-410 parts of a cementing material; 700 to 900 parts of fine aggregate; 1070 to 1300 parts of coarse aggregate; 6-10 parts of an additive; the water-binder ratio is 0.40 to 0.60; the cementing material is prepared from 130 to 150 parts of ordinary Portland cement, 150 to 200 parts of first-grade fly ash and 10 to 40 parts of mineral powder. According to the concrete provided by the invention, the consumption of cement and mineral powder is reduced, the strength grade of the concrete is kept at C30-C40, and 74.7-111.3 kg / m < 3 > of CO2 can be reduced.

Description

technical field [0001] The invention relates to the field of concrete, in particular to a low-carbon concrete and a cementing material therefor. Background technique [0002] In the existing ordinary concrete formula, the cementitious materials mainly include cement, mineral powder and fly ash; in order to ensure the working performance and mechanical properties of the concrete, the cement content in the cementitious material exceeds 60%. It is generally believed that reducing the cement content will lead to concrete. Mechanical properties are difficult to guarantee; the proportion of ore powder is higher than that of fly ash, which is mainly used to provide early strength of concrete and improve the crack resistance and durability of concrete; the addition amount of fly ash is small, and it is generally considered that the addition amount of fly ash is too much , which will affect the strength of concrete, especially the early strength. Therefore, in the existing concrete s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B18/16C04B18/14C04B18/08
CPCC04B28/04C04B18/16C04B18/141C04B18/08C04B18/142C04B2201/50C04B2111/00017C04B14/02C04B14/06C04B2103/302C04B18/12Y02W30/91
Inventor 罗作球丁路静张凯峰王军孟刚陈全滨李微高建梁国立
Owner 中建西部建设北方有限公司
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