Low cementitious material self-compacting concrete
A self-compacting concrete and low-rubber technology, applied in the field of self-compacting concrete, can solve the problems of tailings being discharged into rivers, valleys, lowlands, occupying farmland, forest land, polluting water, soil and atmosphere, etc., so as to improve appearance quality and reduce cementation. The amount of material and the effect of improving the pulp-solid ratio
Active Publication Date: 2011-05-18
北京元泰达环保科技有限公司
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Problems solved by technology
Tailings account for about 1 / 3 of the country's solid waste, but the comprehensive utilization rate of tailings is only about 8.2%. Tailings are discharged into rivers, valleys, and lowlands, polluting water, soil and atmosphere, damaging the environment, and even causing disasters
The mine tailings storage site also occupies a large amount of farmland and forest land, which also pollutes the environment to a certain extent.
Method used
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[0025] Due to the production equipment, the currently commonly used 5-25mm machine crushed stone gradation generally fails to meet the standard requirements. There are obviously more large particles above 16mm, the void ratio is too large, and the covering coefficient of concrete is small, resulting in concrete and easy Poor sex. Smaller particle size stones are used to compound with currently commonly used 5-25mm stones to improve the gradation of coarse aggregates. When the compounding ratio reaches about 50%, the void ratio of aggregates is the smallest. The relationship between compound ratio and porosity is as follows figure 1 shown.
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The invention discloses low cementitious material self-compacting concrete. Cement is a main raw material in a cementitious material of the self-compacting concrete; and if the cement consumption is high, overhigh concrete shrinkage is easily caused due to overhigh hydration heat of the cement, which is unfavorable for concrete crack control and concrete durability improvement, and problems such as disintegration, bleeding and the like easily occur. An additive XAMC is added into the concrete formula and can adsorb onto surfaces of particles to form a close adsorption layer so as to prevent the particles from flocculating and aggregating to realize the dispersion and stabilization function. Water-washing superfine sand which is rich in resources replaces partial mineral admixture, the low cementitious material self-compacting concrete can meet the basic requirement of high strength concrete by adding the XAMC under the condition of reducing cement consumption, and has obvious thickening and water retaining functions; concrete mixtures do not bleed or disintegrate, the homogenization and workability of the concrete are improved, and the concrete has important significance for saving energy and reducing emission.
Description
technical field [0001] The invention relates to a self-compacting concrete, in particular to a low-glue self-compacting concrete prepared by using ultra-fine tailings sand instead of part of the cementitious material. Background technique [0002] Self-compacting concrete refers to the concrete that has high fluidity, good cohesion, uniformity and stability, and is compacted without vibrating by relying on its own weight during pouring. With the rapid development of the modernization of concrete construction projects in our country, self-compacting concrete has attracted widespread attention in our country, and its popularization and application have grown rapidly. Self-compacting concrete can fill the formwork by its own weight, without surface air bubbles or honeycomb pockmarks, and does not require surface repair; it can realistically present the texture or shape of the formwork surface, improving the appearance quality of the concrete. Without vibration, it can be poure...
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Login to View More IPC IPC(8): C04B28/00C04B24/38C04B18/12
CPCC04B28/02
Inventor 聂法智武俊宇朴春爱
Owner 北京元泰达环保科技有限公司
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