Seawater and sea sand-based anticorrosive additive for producing marine high-performance concrete

Abstract

The invention relates to a seawater and sea sand-based anticorrosive additive for producing marine high-performance concrete. The anticorrosive additive is prepared from the following components by mass percent: 10 to 20 percent of calcium nitrite, 3 to 5 percent of sodium carbonate, 3 to 5 percent of sodium sulfate, 1 to 5 percent of chitosan, 0.6 to 1.0 percent of alcohol-amine compounds, 20 to 40 percent of coal ash hollow microbeads, 5 to 10 percent of zeolite molecular sieves, 3 to 5 percent of nanoscale silicon dioxide powder, and the balance of metakaolin, wherein the molar ratio of SiO2 / Al2O3 in the zeolite molecular sieve is 25 to 30. Accordingto the seawater and sea sand-based anticorrosive additive for producing themarine high-performance concrete,the durability of the concrete is improved by the synergistic effect of various ways, and the content of water-soluble chlorine ions in the marine high-performance concrete is gradually decreased in 7 days, 28 to 90 days and is stable for a long term after 90 days, so that the structural safety and durability of marine reinforced concrete is guaranteed.

Description

technical field [0001] The invention relates to an anti-corrosion admixture for producing marine high-performance concrete based on seawater and sea sand. Background technique [0002] The 21st century is the ocean century. my country is an emerging maritime power. In recent years, the construction of marine islands and reefs is facing heavy tasks. The construction of civil and military docks, offshore airports, offshore wind power stations, offshore lighthouses and radar stations, and frontier fortifications on islands and reefs is in full swing. The core technology of high-performance marine concrete on islands and reefs is cement-based cementitious material technology and concrete admixture technology. In the past 20 years, a large number of literatures have been published at home and abroad on marine concrete and its admixture technology, but there are still relatively few research literatures on the use of sea sand aggregates and seawater-cured concrete in China. The ...

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Problems solved by technology

In the past 20 years, a large number of literatures have been published at home and abroad on marine concrete and its admixture technology, but there are still relatively few research literatures on the use of sea sand aggregates and seawater mixed concrete in China

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