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. The preparation method comprises the following preparation steps of adding quick lime into original premixed concrete wastewater slurry for filter pressing treatment, so as to obtain premixed concrete wastewater slurry filter pressing residue; adding the pre-mixed concrete wastewater slurry filter pressing residue and a grinding aid into a ball mill for ball milling to prepare pre-mixed concrete wastewater slurry powder; and mixing and stirring the premixed concrete wastewater slurry powder and ground fly ash to obtain the bleeding-reducing concrete admixture. According to the invention, the waste water slurry produced by premixing concrete in a concrete mixing plant is used as a raw material to prepare the admixture with bleeding reducing performance, so that the use amount of silica fume, mineral powder and other admixtures is reduced, and the cost of the concrete is reduced; and meanwhile, high-value reutilization is conducted on the wastewater slurry of a mixing plant, good economic and environment-friendly effects are achieved, and the concept of sustainable development is met.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a bleeding-reducing concrete admixture and a preparation method thereof. Background technique [0002] With the development and progress of modern science and technology, the scale of basic engineering construction is expanding day by day, and modern construction projects are developing towards high-rise, super high-rise, and long-span frame projects. The demand for concrete is increasing, and the pumping of concrete, anti-segregation, etc. Performance requirements are getting higher and higher. Common admixtures such as fly ash and mineral powder can improve pumpability and fluidity in concrete, and improve the performance of concrete. However, concrete with admixtures is prone to segregation, bleeding, and floating. Defects such as slurry, foam, and apparent quality. [0003] Among them, many problems caused by concrete bleeding have become a major problem restrict...

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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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