C35 low-gel-material self-compacting concrete and preparation method thereof

Abstract

The invention relates to concrete, and specifically relates to C35 low-gel-material self-compacting concrete and a preparation method of the concrete. The scheme of the invention is that the C35 low-gel-material self-compacting concrete comprises the following raw materials, by mass: 180-300 kg / m3 of cement, 30-80 kg / m3 of coal ash, 220-640 kg / m3 of fine river sand, 300-600 kg / m3 of machine-made sand, 600-1100 kg / m3 of cobblestone with a diameter of 5-25 mm, 5-20 kg / m3 of a polycarboxylic acid water reducer, 0.01-0.05 kg / m3 of a thickening agent, and 4-8 kg / m3 of an early strength agent. The C35 low-gel-material self-compacting concrete provided in the invention is less in use amount of materials, has better fluidity and early strength, and plays an important part in accelerating popularization of application of C35 self-compacting concrete.

Description

technical field [0001] The invention relates to concrete, in particular to a C35 low-glue self-compacting concrete and a preparation method thereof. Background technique [0002] Self-compacting concrete (Self Compacting Concrete or Self-Consolidating Concrete referred to as SCC) refers to the ability to flow and compact under its own gravity, even if there are dense steel bars, it can completely fill the formwork, while obtaining good homogeneity, and does not require additional vibrating concrete. The amount of self-compacting concrete cementitious material in the prior art is generally 500kg / m 3 Above, the amount of cement is generally 350kg / m 3 Above, and a large number of mineral admixtures (mineral powder, fly ash) with hydration activity are used. Utilize the concrete prepared by this technology, its strength grade is often above C50; Nie Fazhi et al. (patent CN102060481A) have studied a kind of strength grade C50 level, and the amount of cementitious material drop...

AI Technical Summary

Problems solved by technology

But at this time, the amount of cementitious material is still much more than that of ordinary concrete, and the strength level is still high

In actual engineering applications, the largest and most widely used concrete is C35 grade concrete; however, the industry has not been able to obtain C35 grade self-compacting concrete with less cementitious materials and higher fluidity, which seriously restricts self-compacting concrete. Application of Dense Concrete

Moreover, in the existing self-compacting concrete, large volumes of cement, mineral powder and other cementitious materials are likely to cause durability problems such as excessive heat of hydration and poor volume stability.

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