High-strength high-performance manufactured sand concrete with no mineral admixture

Abstract

The invention discloses high-strength high-performance manufactured sand concrete with no mineral admixture. The concrete comprises parent rock, manufactured sand, cement, a water reducer and water. The compressive strength of the parent rock is higher than 80MPa. The weight content of stone powder in the manufactured sand is 5-10%, and the weight content of mud in the manufactured sand is lower than 0.5%. The usage amount of cement is 490-510kg / m<3>. The concrete has the following mixing ratio parameters: the water-binder ratio is 0.30-0.33, and a sand ratio is 38-41%. The concrete provided by the invention has the following advantages: 1, no mineral admixture is needed, such that materials are saved, and the defect of poor property stability of the mineral admixture is overcome; under the situation with no mineral admixture, concrete mechanical performances such as compressive strength satisfy the requirements of C50 concrete; 2, concrete fluidity and workability are improved through specific parameters; 3, the parent rock is used, such that local materials can be used, and a problem of river sand shortage can be solved; and 4, concrete cracks can be reduced, and concrete durability can be improved.

Description

technical field [0001] The invention relates to a concrete formula, in particular to a high-strength and high-performance machine-made sand concrete without mineral admixtures. Background technique [0002] Existing concrete formulations include cement, sand, stone, admixtures such as water reducers and external admixtures, wherein external admixtures are mineral admixtures such as fly ash and pozzolan to improve the mechanical and chemical properties of concrete. [0003] For example, the invention patent application document with the publication number CN104310908A discloses a kind of concrete, which is made by mixing cement, medium sand, aggregate, reinforcing fiber, admixture and water. The mass parts of each component are as follows: cement 300-450 650-800 parts of medium sand; 780-900 parts of aggregate; 10-20 parts of reinforcing fiber; 4-8 parts of admixture; 180-200 parts of water. Among them, the reinforcing fiber is steel fiber, glass fiber and carbon fiber, whic...

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Problems solved by technology

[0004] As another example, the invention patent with the publication number CN101659535B discloses a marine concrete, the formula includes 30-35% of cement clinker; 40-45% of ground slag powder; 20-25% of fly ash; 5-8% of gypsum , to overcome defects such as increased autogenous shrinkage of concrete, concrete cracking, decreased ability of hydrates to bind chloride ions, and large difference in viscosity of the mixture

[0005] Mineral admixtures such as fly ash and reinforcing fibers exist in the technical solutions in the above two comparative documents. The existing problems are: 1. The performance of mineral admixtures is unstable and the cost is high; When sand is in short supply, local materials cannot be obtained

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