High-expansion-energy steel slag concrete and preparation method thereof

Abstract

The invention provides high-expansion-energy steel slag concrete which comprises the following raw materials in parts by weight: 20-25 parts of cement, 12-15 parts of coarse steel slag, 40-45 parts ofbroken stone, 40-45 parts of steel slag sand, 10-14 parts of water and 0-5 parts of an additive. A preparation method comprises the following steps: selecting one group of samples from the three groups of samples as a reference mix proportion according to requirements; designing the mix proportion of the high-expansion-energy steel slag concrete by utilizing a strength design formula and an expansion rate design formula; comparing the design mix proportion with a reference mix proportion, and if the design mix proportion is far away from the reference mix proportion, adjusting the replacementamount of the steel slag sand in the high-expansion-energy steel slag concrete, the particle size range of the steel slag sand or the water cement ratio and other factors; and then preparing, pouringand curing the high-expansion-energy steel slag concrete. The high-expansion-energy steel slag concrete disclosed by the invention can be suitable for underground waterproof engineering, high-crack-resistance concrete engineering, constrained self-stress concrete engineering and anti-seismic engineering with high expansion rate and high strength requirements.

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 ...

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Problems solved by technology

Due to its low strength and low expansion rate, it is difficult to be used in underground waterproof projects, ...

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