Super retarding concrete and application thereof

Abstract

The invention provides super retarding concrete which comprises the following components by weight percentage: 11-16 percent of cement, 2-4 percent mineral powder, 3-5 percent of coal ash, 23-30 percent of sand, 39-50 percent of crushed stone, 0.15-0.3 percent of retardant, 0.2-0.4 percent of additive and 7-12 percent of water, wherein the sum of the percentage contents of all components is 100 percent. The super retarding concrete greatly prolongs the setting time under condition of ensuring adequate long-term strength, has the advantages of good cohesiveness and water retention, and avoids segregation and bleeding phenomenon before or after being poured.

Description

technical field [0001] The invention relates to a super-retarding concrete composition and the application of the super-retarding concrete in the construction of a hole-forming occlusal pile with a full casing drilling rig. Background technique [0002] On the one hand, ultra-retarded concrete requires that the concrete has a long setting time in the early stage, and on the other hand, the concrete must have sufficient late strength to meet the design requirements. This is the difficulty in the development of ultra-retarded concrete. Under the same external environment, the setting time of concrete depends on the selection and dosage of raw materials. It mainly involves the type and strength grade of cement, the amount of fly ash, the particle gradation of aggregate, the type and amount of admixture, and the performance and amount of other admixtures. Among them, the selection and dosage of admixture are the key to the preparation of super-retarded concrete, because the re...

AI Technical Summary

Problems solved by technology

Adding admixtures is the main means of preparing ultra-retarded concrete, but not the only means

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