A kind of low thermal expansion concrete and admixture

Abstract

The invention relates to a low thermal expansion concrete and an admixture. The concrete includes cement clinker, fly ash, zeolite powder, granite crushed stone, and the balance is water. The cement clinker is composed of C3S: 5-20% , C2S: 20-45%, C3A: 5-10%, and C4AF: 5-10%, characterized in that the cement clinker also includes barium oxide 20-40%, strontium oxide 5-15%, cement clinker: ( Fly ash + zeolite powder): granite crushed stone = 1:1‑2:2‑4, water: cement clinker = 0.2‑0.4. For the first time, barium oxide and strontium oxide were used as expansion admixtures, and at the same time, with the newly developed retarder, and the combination of fly ash as an alternative material, especially zeolite powder, and the particle size ratio of granite crushed stone aggregate, the final The effect of concrete with low heat and micro-expansion is realized.

Description

technical field [0001] The application relates to the field of construction engineering, in particular to cement / concrete (concrete), in particular to a low-heat micro-expansion concrete. Background technique [0002] Cement concrete is by far the largest man-made material in the world, and this situation will continue for a long time in the future. Concrete has two inherent material characteristics, one is the volume deformation-shrinkage accompanied by strength growth during the hydration hardening process, and the other is the low tensile-compressive strength ratio of concrete materials. Concrete fractures (cracks) when the tensile stress inside the concrete caused by shrinkage exceeds the tensile strength of the concrete. It is generally considered that cracks are the biggest defect of concrete structures, which will lead to the intrusion of harmful media such as moisture, CO2, Cl-, etc., accelerate the corrosion of steel bars and reduce durability, and cause the reduct...

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Problems solved by technology

[0014] Based on the researches on expansion and low-heat cement concrete in the above-mentioned theoretical and engineering circles, there is still the problem of insufficient compensation in the early and mid-term, especially in the early stage, resulting in concrete cracking

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