High folding resistance road concrete material and preparing method thereof

Abstract

The invention discloses a road concrete material with high folding strength and a production method thereof. The road concrete material with high folding strength mainly contains binding agent, sand stone aggregate, mixing water, concrete admixture and excitant. The binding agent is composed of common silicate cement, ore slag powder and steel slag powder. The mass percentages of the components are as follows: 60-70% of common silicate cement, 20-30 % of ore slag powder and 0-10% of steel slag powder. The additional amount of the excitant is 5.0-10.0% of the total mass of the ore slag powder and the steel slag powder. The excitant is selected from gypsum, sodium sulfate, sodium fluoride, triethanolamine or a mixture thereof. By adding the excitant, the latent activity of the ore slag and the steel slag is excited, so that the compactness of concrete is improved and the folding strength of the road concrete is greatly improved.

Description

[technical field] [0001] The invention relates to inorganic non-metallic materials, in particular to a road concrete material and a preparation method thereof. [Background technique] [0002] The highway construction industry is the basic industry of the economy and plays a vital role in the development of the national economy. At present, my country's highways are far ahead of the sum of other modes of transportation in terms of passenger traffic, freight volume, and passenger turnover. However, with the rapid development of roads, especially expressway construction, the problem of premature destruction of large areas of roads is also very prominent. Many newly-built or recently overhauled national and provincial roads have experienced serious early damage, which is far behind the design service life. Reasons for premature failure of concrete pavement include design, construction and use reasons. But the most important factor is that the huge load and traffic volume will...

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Problems solved by technology

[0006] (1) At present, the water ash used in concrete in road construction is relatively large, the density of this concrete is small, and there are many internal defects in the concrete, resulting in low flexural strength of the concrete;

[0007] (2) Not enough attention is paid to the homogeneity of the concrete composite system. Usually, the concrete testing in the project only tests whether the compressive strength meets the design requirements, while ignoring the homogeneity of the concrete. The composition of modern concrete is becoming more and more complex, and requires higher Slump and expansion, but the increase of concrete fluidity is often accompanied by the decline of homogeneity, and the phenomenon of bleeding or even hardening of concrete is common. Bleeding causes the actual water-cement ratio of the concrete surface slurry to be relatively large, and the slurry is loose;

[0008] (3) The admixture technology is backward, and the compatibility of the admixture with cement and admixture is poor. At present, the compatibility of the admixture is only a vague qualitative evaluation, and the admixture is simply evaluated by compatibility and incompatibility. The compatibility of the agent is far from enough;

[0009] (4) The cement plant excessively pursues early strength and reduces costs, and the cement grinds more and more finely. Excessive addition of mud content, high carbon content, or early-strength admixtures all reduce the compatibility of concrete admixtures;

[0010] (5) Improper use of cementitious materials. In order to reduce costs, concrete manufacturers try to reduce the total amount of cementitious materials. When the total amount of concrete cementitious materials is too low, even if the slump can meet the pumping requirements (≥140mm), this The fluidity of the concrete is poor, and the slurry cannot wrap the coarse aggregate well. This kind of concrete is difficult to vibrate during the construction process, and it is easy to form large defects, which will affect the flexural performance of the concrete.

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