Early-stage anti-cracking high-strength concrete and preparation method thereof

Abstract

The invention discloses early-stage anti-cracking high-strength concrete and a preparation method thereof, and relates to the technical field of concrete. The early-stage anti-cracking high-strength concrete comprises the following components in parts by weight: 190 to 210 parts of water, 330 to 350 parts of Portland cement, 480 to 520 parts of medium sand, 720 to 790 parts of broken stone, 2.5 to3.5 parts of a water reducing agent, 60 to 80 parts of mineral powder, 4 to 6 parts of a retarder, and 30 to 35 parts of full tailings with the density of 2.69 g / cm<2>, the loose volume weight of 1.3g / cm<3> and the porosity of larger than 50%. The early-stage anti-cracking high-strength concrete is prepared by the following steps: S1, fully mixing Portland cement, medium sand, broken stone, mineral powder and full tailings in corresponding parts by weight to form a mixture, S2, adding the retarder and the water reducing agent in corresponding parts by weight into water to form a mixed solution, and S3, adding the mixed solution into the mixture, and continuously stirring and mixing to obtain the product. The prepared concrete has the advantages of being high in structural strength and not prone to cracking in the early forming process.

Description

technical field [0001] The invention relates to the technical field of concrete, more specifically, it relates to an early crack-resistant high-strength concrete and a preparation method thereof. Background technique [0002] Concrete refers to the cement concrete obtained by using cement as the cementitious material, sand and stone as the aggregate, mixed with water, admixtures and admixtures in a certain proportion, and is also called ordinary concrete. It is widely used in civil engineering . [0003] A concrete formula is disclosed in the Chinese invention application patent with the publication number CN107188466A, which is made of the following components according to the weight ratio: 100-150 parts of cement; 5-25 parts of iron powder; 760-880 parts of sand ; 50-70 parts of fly ash; 15-34 parts of waste calcined material; 15-30 parts of admixture; 170-190 parts of slurry; 36-85 parts of aggregate; -520 parts; gravel 1050-1100 parts. [0004] In the patent applicati...

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Problems solved by technology

[0004] In the patent application for the above-mentioned invention, slurry water, mineral powder, fly ash, stone chips and ultra-fine sand are waste materials whose consumption accounts for more than 45% of the total amount of concrete materials. The material cost is low and the cost of concrete raw materials is reduced, but the waste The stability of segmented sinter is poor. When it is used in the preparation of concrete, it has poor combination with other raw materials, resulting in poor compactness of concrete, which in turn leads to low overall structural strength of concrete. prone to breakage or cracking

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