Preparation method of expansion rate-controllable steel pipe and steel-slag concrete column
A technology of steel slag concrete and expansion rate, which is applied in the field of civil engineering, can solve the problems of increasing construction cost and difficulty, difficulty in achieving the best effect, complicated concrete hardening and hydration process, etc., so as to reduce project cost and construction difficulty, and improve The effect of economic and social benefits
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[0031] The present invention will be described in detail below in conjunction with specific examples of steel pipe steel slag concrete columns.
[0032] Steel slag is a kind of industrial waste. The steel slag used in the present invention is Masteel steel slag. The chemical composition of steel slag measured by X-ray fluorescence spectroscopy (XRF) is shown in Table 1. From Table 1, it can be seen that the chemical composition of steel slag is related to Cement is similar, with certain hydraulic activity, the main mineral phase includes C 3 S, C 2 S, RO, C 2 F, is the main factor for the expansion of steel slag concrete in the steel pipe. The invention uses steel slag sand instead of all fine aggregates, and utilizes the potential activity of the steel slag sand to fully expand the free CaO contained in the steel slag during the later hydration reaction process, thereby achieving the goal that the core concrete enters the three-way compression state in advance. The grain size of...
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