Preparation method of expansive concrete containing steel slag

Abstract

The invention discloses a preparation method of expansive concrete containing steel slag, and belongs to the technical field of building materials. Different types of expansive concrete is prepared from ordinary portland cement, fine aggregate (steel slag sand and yellow sand), coarse aggregate (coarse steel slag and broken stone) and water. The preparation method comprises specific steps as follows: seven groups of samples which basically meet the technical parameter requirements of expansive concrete are preferably selected according to an orthogonal test; sample classification which is close to the expansion rate of expansive concrete is selected, and a mixture ratio of the expansive concrete containing the steel slag is preliminarily determined; whether the compressive strength of the expansive concrete containing the steel slag meets the design requirements of expansive concrete is calculated, and the water cement ratio of the expansive concrete containing the steel slag is adjusted; whether the expansion rate of the expansive concrete containing the steel slag meets the design requirements of the expansive concrete is calculated, and the average grain diameter and the substitution amount of steel slag sand in the expansive concrete containing the steel slag are adjusted; and then, the expansive concrete containing the steel slag is prepared, cast and maintained. According to the preparation method, the compressive strength and the expansion rate of the expansive concrete containing the steel slag can be adjusted, and the engineering application range is wide.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a preparation method of steel slag expansive concrete, which is suitable for structures such as construction engineering, road and bridge engineering, and water conservancy engineering. Background technique [0002] Expansive concrete is a special kind of concrete, which is a concrete in which expansion cement or expansion agent generates calcium sulfoaluminate hydrate (calcium vanadium stone) through hydration and undergoes volume expansion. In addition to the functions of compensating shrinkage and generating self-stress, expansive concrete also has Permeability Strong, fast hardening in the early stage, high strength in the later stage, durable Sulfate Good performance, low temperature hardening, small cross-section, light weight and so on. [0003] There are two main sources of expansion energy for expansive concrete: one is to add an expansion agent...

AI Technical Summary

Problems solved by technology

[0003] There are two main sources of expansion energy for expansive concrete: one is to add an expansion agent to the concrete. The addition of the expansion agent is only beneficial to the early expansion of the concrete, and has little effect on the later expansion of the concrete, and the existing expansion agent There are disadvantages such as the inconsistency between the development of concrete strength and durability and the expansion rate of the expansive agent, the actual dosage is large, the conditions for the use of the expansive agent and the strict requirements for the maintenance environment of the concrete mixed with the expansive agent, etc., resulting in many inconsistencies when using the expansive agent. a successful example

The second is to use expansive cement when preparing concrete. On the one hand, the use of expansive cement has certain environmental conditions, which limits its wide application in engineering; on the other hand, it increases the construction cost and difficulty, making the hardening and hydration process of concrete more difficult. Complicated, difficult to achieve expected results

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