Seawater mixed coral potassium magnesium phosphate cement-based material and its preparation method, specimen curing method

Abstract

A seawater mixed coral potassium magnesium phosphate cement-based material, its preparation method, and a test piece maintenance method relate to the field of civil engineering materials. The seawater mixed coral potassium magnesium phosphate cement-based material is made of coral potassium magnesium phosphate cement-based powder and seawater. The obtained coral potassium magnesium phosphate cement-based powder includes, by mass percentage: 75%-90% potassium magnesium phosphate cement; 5%-15% coral micropowder; and 5%-10% nickel slag powder. The seawater-mixed coral potassium magnesium phosphate cement-based material has controllable setting time, high early strength and continuous increase in later strength, and strong seawater erosion resistance. The preparation method of the seawater mixed coral potassium magnesium phosphate cement-based material has the advantages of simple process, energy saving and environmental protection, and low cost. Seawater mixed with coral potassium magnesium phosphate cement-based material specimens can reduce the shrinkage deformation of the specimens and increase the residual rate of compressive strength after long-term immersion in seawater.

Description

technical field [0001] The invention relates to the field of civil engineering materials, and in particular to a seawater-mixed coral potassium magnesium phosphate cement-based material, a preparation method thereof, and a test piece maintenance method. Background technique [0002] With the development of the ocean and the competition for ocean rights and interests, the number of ocean engineering constructions is increasing day by day. For the construction of islands and reefs far away from the mainland, all required materials need to be transported from the mainland. The transportation cost is very expensive, and the transportation is subject to wind and waves. And other natural conditions, it is difficult to guarantee the construction period. Therefore, the development of engineering construction materials that can be obtained locally on islands and reefs is one of the urgent problems to be solved in island and reef engineering construction. [0003] Among the many isla...

AI Technical Summary

Problems solved by technology

However, coral debris and seawater are rich in Cl - , SO 4 2- , Mg 2+ Plasma will have a serious impact on the setting time and strength of ordinary Portland cement series materials, and because the hardened body of ordinary Portland cement has a porous structure, the resistance to chloride ion diffusion and seawater erosion are poor, so the durability Difficult to be guaranteed, unable to meet the increasingly diverse needs of island and reef engineering construction

[0004] In order to improve the performance of coral cement-based materials mixed with seawater, it has been improved by increasing C in Portland cement. 3 A.C 4 AF content, mineral admixture, coral cleaning with fresh water, fresh water mixing and curing methods for Portland cement-based materials, but due to the inherent defects of Portland cement hardened body structure, its early strength, chloride ion diffusion resistance and resistance The improvement of seawater erosion ability is limited, so the obtained seawater mixed coral portland cement-based material has the defects of slow setting, low early strength, poor resistance to chloride ion diffusion and seawater erosion resistance

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