A kind of high expansion energy steel slag concrete and its preparation method

Abstract

The invention provides a steel slag concrete with high expansion energy, which comprises cement, coarse steel slag, gravel, steel slag sand, water and admixture, and the parts by weight of each raw material are: 20-25 parts of cement, 12-15 parts of crude steel slag, crushed stone 40-45 parts, steel slag sand 40-45 parts, water 10-14 parts, admixture 0-5 parts. The preparation method includes the following steps: selecting one of the three groups of samples as a reference mix ratio according to requirements; using the strength design formula and the expansion rate design formula to design the mix ratio of high expansion energy steel slag concrete; comparing the design mix ratio with the reference mix ratio For comparison, if the design mix ratio is far from the reference mix ratio, it is necessary to adjust the replacement amount of steel slag sand in high expansion energy steel slag concrete, the particle size range of steel slag sand, or the water-cement ratio; then prepare, pour, and maintain high expansion energy steel slag concrete. The high expansion energy steel slag concrete of the present invention can be applied to underground waterproof projects with high expansion rate and high strength requirements, high crack resistance concrete projects, constrained self-stress concrete projects and earthquake resistance projects.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a steel slag concrete with high expansion energy and a preparation method thereof. Background technique [0002] Expanded concrete is a high performance concrete. Its expansion mechanism is: in the process of hydration reaction, the expansion source (expansion agent or expansion cement) is rich in free calcium oxide and magnesium oxide, hydration generates calcium silicate hydrate and calcium aluminate hydrate, and forms calcium vanadium stone, resulting in volume expansion. [0003] At present, more than 90% of the existing expansion agents on the market belong to Type I products specified in GB23439-2017 "Concrete Expansion Agents", and the expansion rate is only 3.5×10 -4 . On the one hand, such products have small expansion energy and have no significant effect on high-strength and high-performance concrete, which greatly limits the development of the expansion ...

AI Technical Summary

Problems solved by technology

Due to its low strength and low expansion rate, it is difficult to be used in underground waterproof projects, high crack-resistant concrete projects, constrained self-stressed concrete projects and earthquake-resistant projects.

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