Offshore low heat cement

Abstract

The invention relates to maritime work low-heat cement. Low-heat Portland cement clinker, a mixed material, sinking beads and gypsum are mixed and jointly ground till the specific surface area is 300-350 m<2> / kg, and therefore the maritime work low-heat cement is prepared, wherein the maritime work low-heat cement is prepared from, by weight, 74-93% of low-heat Portland cement clinker, 1-20% of the mixed material which is at least one of slag, silica fume and nanometer alumina-silica material, 2-5% of the sinking beads and 4-6% of the gypsum. The maritime work low-heat cement is low in hydration heat, 3d hydration heat is smaller than or equal to 220 kJ / kg, and 7d hydration heat is smaller than or equal to 240 kJ / kg; the maritime work low-heat cement is applicable to large-volume marine engineering concrete, and has the effect of resisting and preventing cracks; the early strength is high, 3d strength is larger than or equal to 17.0 MPa, and the requirement for the construction progress of marine engineering can be met; the erosion resistance is good, a 28d chloride ion diffusion coefficient is smaller than or equal to 1.0*10-12 m<2> / s, and a 28d anti-erosion coefficient Kc is larger than or equal to 1.2.

Description

technical field [0001] The invention relates to a cement, in particular to a marine low-heat cement. Background technique [0002] With the deepening of my country's participation in economic globalization and regional economic integration, the development of marine resources has become the strategic focus of my country's economic development. Ocean engineering plays an important supporting role in the development of marine economy. With the southward shift of my country's marine resources development strategy and the implementation of a number of major ocean engineering project construction and planning in recent years, my country's ocean engineering construction is about to usher in a climax. However, the humidity, temperature, salinity and other factors of ocean engineering are different from those of land engineering, and the environment faced by the latter is more severe. At present, my country's marine engineering generally has problems such as easy cracking, poor cor...

AI Technical Summary

Problems solved by technology

However, due to the characteristics of mineral composition, low-heat Portland cement has insufficient resistance to chloride ion and sulfate erosion, which restricts its application in marine engineering.

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