Method for producing C40 concrete

Abstract

The invention provides a method for producing C40 concrete. The method comprises the following steps: (1) preparing the following raw materials in parts by weight for each cubic meter of concrete: 230-240Kg of cement, 95-105g of coal ash, 160-170kg of water, 830-840kg of sand, 935-955kg of bluestone, 120-130kg of mineral powder, 8-10kg of a composite water reducing agent and 12-18kg of a mixed fiber, wherein the composite water reducing agent comprises a polycarboxylate superplasticizer, an aliphatic water reducing agent, a reinforcing agent, an expanding agent, an anti-sinking agent, a defoaming agent and water; the mixed fiber is a mixture of aluminum oxide fine powder, short carbon fiber, polyethylene long fiber and coconut shell fiber, and the bluestone is crushed for certain size grading; (2) preparing the composite water reducing agent; and (3) adding the coal ash and the mineral powder into an upright stirrer, performing stirring, adding bluestone, sand and cement, performing stirring at a speed of 90-105r / min, adding the mixed fiber, performing stirring at a speed of 230-260r / min, adding the composite water reducing agent and water, performing stirring at a speed of 130-150r / min firstly, and further performing stirring at a speed of 160-180r / min, so as to obtain the C40 concrete. The C40 self-compacted concrete produced by using the production method which is provided by the invention and is used for producing the C40 concrete takes both good compensation shrinkage and peaceability into account.

Description

technical field [0001] The invention relates to concrete technology, in particular to a production method of C40 concrete. Background technique [0002] Self-compacting concrete is a kind of concrete that can flow and compact under its own gravity without external force, and can evenly fill the entire model without additional vibration. Therefore, in the casting process, it needs to meet the requirements of greater fluidity, better stability and excellent filling properties. [0003] The powder material used in existing self-compacting concrete to fill the gaps formed when aggregates are piled up is usually a cementitious material slurry formed by cement and fly ash. However, in the preparation process of C40 self-compacting concrete with higher strength, it is easy to increase the shrinkage value due to the high amount of cementitious material required, which reduces the crack control and durability of concrete; although existing The addition of admixtures is chosen to co...

AI Technical Summary

Problems solved by technology

However, in the preparation process of C40 self-compacting concrete with higher strength, it is easy to increase the shrinkage value due to the high amount of cementitious material required, which reduces the crack control and durability of concrete; although existing Choose to add admixtures to compensate for shrinkage, but it is difficult to ensure the performance requirements of workability of self-consolidating concrete

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