A kind of bleeding-reducing concrete admixture and preparation method thereof

Abstract

The invention relates to the technical field of building materials, in particular to a bleeding-reducing concrete admixture and a preparation method thereof, wherein the preparation method includes the following preparation steps: adding quicklime to the original ready-mixed concrete waste slurry to perform pressure filtration treatment to obtain a pre-mixed concrete admixture. Mixing waste concrete slurry press filter residue; adding the ready-mix waste concrete slurry filter residue and grinding aid into a ball mill for ball milling to obtain ready-mix waste concrete slurry powder; mixing the ready-mix waste concrete slurry powder and pulverized coal The ash is mixed and stirred to prepare the bleeding-reducing concrete admixture. The invention uses the waste cement slurry produced by the ready-mixed concrete in the concrete mixing plant, and uses it as a raw material to prepare an admixture with reduced bleeding performance, which reduces the amount of other admixtures such as silica fume and mineral powder, and reduces the cost of concrete ; At the same time, high-value reuse of waste slurry from mixing plants has good economic and environmental effects, and is in line with the concept of sustainable development.

Description

A kind of reducing bleeding type concrete admixture and preparation method thereof technical field The present invention relates to building material technical field, particularly a kind of reducing bleeding type concrete admixture and preparation thereof method. Background technique With the development and progress of modern science and technology, the construction scale of basic projects is expanding day by day, and modern construction projects are becoming more and more advanced. With the development of high-rise, super high-rise and long-span frame engineering, the demand for concrete is increasing, and the pumping and anti-segregation properties of concrete are The demands are getting higher and higher. At present, the common admixtures such as fly ash and slag powder can improve the pumpability and flow rate of concrete in concrete. It can improve the performance of concrete, but the concrete with admixtures is prone to segregation, bleeding, laitance, buoyan...

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Problems solved by technology

[0005] At present, my country's ready-mixed concrete products have been serialized, but there are shortcomings such as uneven technology and management levels, low automation, weak environmental protection awareness, insufficient investment in separation and circulation facilities, and insufficient policy implementation. Mixed concrete waste slurry is discharged randomly, polluting the environment; the random disposal of ready-mixed concrete waste slurry by concrete mixing stations not only destroys the environment, but also causes a great waste of resources. One of the enterprises pays for the treatment of ready-mixed concrete waste slurry every year A large number of waste disposal fees increase the comprehensive cost of concrete production; secondly, these ready-mixed concrete waste slurry burying requires a large amount of land, resulting in a waste of land resources; thirdly, the ready-mixed concrete wastewater after the slurry is separated by sedimentation The mud is strongly alkaline, and its pH value is generally 10-12, which greatly pollutes the soil alkalization and water resources. Great waste of resources and water

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