Preparation method of modified coral aggregate and basic magnesium sulfate cement gradient composite coral aggregate concrete

A magnesium sulfate and concrete technology, applied in the field of concrete, can solve problems such as increasing safety risks and affecting the durability of Portland cement-based materials
CN113185168AActive Publication Date: 2021-07-30ANHUI UNIVERSITY OF ARCHITECTURE
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ANHUI UNIVERSITY OF ARCHITECTURE
Publication Date
2021-07-30

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Abstract

The invention relates to the technical field of concrete, and particularly discloses a preparation method of modified coral aggregate and basic magnesium sulfate cement gradient composite coral aggregate concrete. The preparation method comprises the following steps: firstly, soaking original coral aggregate in a weak acid aqueous solution for micro-corrosion to obtain acid-treated coral aggregate, and then soaking the acid-treated coral aggregate in a basic magnesium sulfate cement-based slurry coating material prepared from active magnesium oxide, magnesium sulfate heptahydrate, citric acid and water to obtain modified coral aggregate; and preparing the basic magnesium sulfate cement-based coral aggregate concrete from the aggregate, active magnesium oxide, magnesium sulfate heptahydrate, citric acid and water as raw materials. Based on a core admixture and a gradient composite technology, the invention provides a method for enabling basic magnesium sulfate cement whiskers to grow in communicated pores of coral aggregate, and external pores of the coral aggregate are fully filled with gradient composite basic magnesium sulfate cement. The effects of reducing the overall porosity of the coral aggregate concrete, optimizing the concrete interface transition area and improving the working performance and the mechanical property of the concrete are achieved.
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Description

technical field

[0001] The invention relates to the technical field of concrete, and specifically discloses a preparation method of modified coral aggregate and basic magnesium sulfate cement gradient composite coral aggregate concrete. Background technique

[0002] Coral is a special sedimentary rock, mainly composed of coral reef algae and marine biological bone debris, and more than 96% of it is calcium carbonate. Scholars have found that it is feasible to use coral coarse aggregate to make concrete. At present, coral aggregate has been widely used in marine concrete.

[0003] Although coral aggregate alleviates the huge demand for aggregate in marine engineering, compared with ordinary concrete, the unit water consumption of coral concrete is large and the amount of cement required is 30%-40% more than ordinary concrete. At the same time, coral concrete also exhibits a characteristic of low strength and high brittleness. Although the use of mineral admixtures and admi...

Claims

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