Seawater coral aggregate concrete

Abstract

The invention provides seawater coral aggregate concrete prepared by matching low-heat portland cement for ocean projects, a seawater coral aggregate concrete salt fixing agent, a pre-screened natural coral-sand mixture (with the particle size of 0-20 mm), a pre-screened broken coral-sand mixture (with the particle size of 0-31.5 mm), a coral aggregate seawater concrete water reducing agent, a concrete retarder, a concrete defoaming agent, natural seawater or primary desalined seawater. With application of the seawater coral aggregate concrete, the shortcomings that ordinary cement and low-strength coral concrete easily generate long-term strength back shrinkage, skin cracking and peeling of surface salt marsh, frequently happening shrinkage cracks and temperature cracks and poor new mixing workability and thus cannot be pumped for construction on service in a tropical offshore reef harsh environment can be overcome; the ratio of used local materials reaches up to 75% or more, so the shortcomings of high cost, time consuming, labor consuming, high energy consumption and low efficiency due to long-distance sea transportation of ordinary concrete large-amount raw materials in offshore reef construction projects can be overcome.

Description

technical field [0001] The invention relates to the technical field of civil engineering and marine engineering materials, in particular to seawater coral aggregate concrete. Background technique [0002] To carry out civil engineering construction on remote islands and reefs more than 1,000 kilometers away from land, such as the land reclamation project on islands and reefs in the South China Sea, requires the use of huge amounts of concrete materials. Offshore revetment on the periphery of islands and reefs (including molded bag concrete, wave retaining walls, twisted work / Wang character wave breaking blocks), island and reef roads, water conservancy, wharves, cofferdams, airports, housing construction, municipal, civil and military fortifications, etc. The project requires the use of a large amount of concrete. [0003] my country's South China Sea islands and reefs are close to the equator, with high temperature, high humidity, high salinity, rainy, strong wind, sun exp...

AI Technical Summary

Problems solved by technology

[0007] In view of this, the present invention provides a kind of seawater coral aggregate concrete, which has the advantages of low shrinkage, low heat of hydration, and high-strength pumping, so that it can overcome the common cement and low-strength coral concrete in the prior art. The typical shortcomings of long-term strength shrinkage, salty surface peeling, frequent shrinkage cracks and temperature cracks, and poor workability of freshly mixed materials under the harsh environment of islands and reefs; moreover, the proportion of local materials is as high as 75%. %, so it can overcome the disadvantages of high cost, time-consuming, labor-intensive, high energy consumption and low efficiency caused by long-distance shipping of ordinary concrete bulk raw materials in construction projects on remote sea islands and reefs