Preparation process for high-strength concrete

Abstract

The invention discloses a preparation process for high-strength concrete. The preparation process comprises the following steps: step 1, mixing coarse aggregate with fine aggregate in an agitator according to a weight ratio of 2: 1 under stirring for 1-2 h until the coarse aggregate and the fine aggregate are completely mixed; and then adding modified alkali lignin and low-viscosity cellulose ether, and carrying out stirring for 20-30 min with a stirring speed increased to 200-300 r / min. According to the invention, the coarse and fine aggregate and Portland cement are combined as a base material; and the added alkali lignin conventionally plays a water reducing effect in concrete and is utilized to modify the concrete material in the invention to form a three-dimensional net cross-linked structure.

Description

Technical field [0001] The invention relates to the technical field of concrete, in particular to a preparation process of high-strength concrete. Background technique [0002] As a new building material, high-strength concrete is widely used in high-rise building structures, long-span bridge structures and some special structures due to its high compressive strength, strong resistance to deformation, high density, and low porosity. application. The biggest feature of high-strength concrete is its high compressive strength, which is generally 4-6 times that of ordinary strength concrete, so it can reduce the cross-section of the components, so it is most suitable for high-rise buildings. Tests show that under certain axial compression ratio and appropriate hoop ratio, high-strength concrete frame columns have good seismic performance. Moreover, the size of the column section is reduced, the dead weight is reduced, and short columns are avoided, which is also beneficial to the s...

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Problems solved by technology

[0003] High-strength concrete is different from the concrete commonly used now, and it can be used in high-rise buildings and bridge structures, while the concrete commonly used now is used for pavement subgrade materials, which is far from the high-strength concrete studied by the present invention. Fiber materials appear in the existing high-strength concrete. As a reinforcement of high-strength concrete, although it can improve the strength performance of concrete, it has low fiber activity and poor compatibility with other raw materials, so it needs further development and research.

[0004] Chinese patent literature (publication number: CN108821699A) discloses a kind of high-strength concrete for high-rise buildings, and its component mixing ratio is cement 360-390Kg / m 3 , slag fine powder 70-80Kg / m 3 , silicon powder 30-45Kg / m 3 , fine aggregate 620-690Kg / m 3 , coarse aggregate 1000-1150Kg / m 3 , water 160-190Kg / m 3 , superplasticizer 5-8Kg / m 3 , mixed fiber 1-3Kg / m 3 , the invention is prepared by using existing conventional raw materials plus mixed fibers, the mixed fibers are one or two combinations of steel fibers and high elastic polyethylene fibers, and the steel fibers and high elastic polyethylene fibers themselves have low activity energy , the possibility of entanglement is reduced, and the improvement in concrete toughness and strength is not significant

[0005] Chinese patent literature (publication number: CN108821702A) discloses a steel slag powder high-strength concrete and a preparation method thereof. The steel slag powder high-strength concrete includes the following components: 480-540 parts of cementitious material, 550-750 parts of fine aggregate , 1100-1300 parts of coarse aggregate, 3-10 parts of admixture, 120-150 parts of water, wherein the cementitious material comprises 50-70% cement and 30-50% iron and steel slag powder by mass percentage, so Said steel slag powder includes 30% steel slag powder and 70% slag powder, its 7d activity index is 55%, and its 28d activity index is 75%. Strength and other properties are not very significant

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