A preparation method of high-strength coral aggregate concrete under low-pressure conditions

Abstract

The invention discloses a method for preparing high-strength coral aggregate concrete under low-pressure conditions. Weigh the raw materials according to the following parts by weight: 20~45 parts of cement, 5~18 parts of mineral admixture, 45~58 parts of coral aggregate, 10~16 parts of mixing water, and water reducing agent and defoaming agent. The weight of the agent is 2-5% of the sum of the weight of cement and mineral admixture, and the weight of the defoamer is 2-6% of the sum of the weight of cement and mineral admixture. Mix cement and mineral admixture evenly to prepare cementitious material, put coral aggregate, seawater, water reducer, defoamer and 55-85% cementitious material into a closed mixing system, and stir under low pressure conditions After 10 to 15 minutes, put the remaining cementing material into the mixing system and continue stirring for 10 to 15 minutes to obtain high-strength coral aggregate concrete. The coral aggregate concrete of the present invention has high-strength mechanical properties, high compactness, good impermeability and durability, and has the advantages of local materials and resource maximization for remote sea island and reef construction projects, and meets the requirements of the national marine strategy .

Description

technical field [0001] The invention belongs to the technical field of building engineering materials, and in particular relates to a preparation method of high-strength coral aggregate concrete under low-pressure conditions. Background technique [0002] Without destroying the local ecological environment and maximizing the utilization of resources, the all-coral concrete prepared with coral debris as aggregate and seawater instead of fresh water is of great significance for reducing the construction cost of remote islands and reefs and shortening the construction period. With the infrastructure construction of oceanic islands and reefs and the construction of military protection projects becoming more and more perfect, some special island and reef engineering constructions have higher requirements for the performance, especially the strength, of coral concrete. However, due to the many internal voids and defects in the coral aggregate, and the low strength of the aggregate...

AI Technical Summary

Problems solved by technology

However, due to the many voids and defects inside the coral aggregate, and the aggregate's own strength is low, at the same time, there are a large number of open pores on the surface of the coral aggregate, the surface is rough, and the water demand is large. Densified molding causes strength loss

Therefore, coral concrete prepared by conventional methods often has shortcomings such as low density, small elastic modulus, high porosity, and low strength. It is difficult to prepare high-strength coral concrete by means of aggregate surface treatment and lower water-binder ratio. The strength improvement effect is limited, and the further development and application of coral concrete is greatly restricted

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