A kind of high anti-corrosion Portland cement early strength agent and preparation method thereof

Abstract

The invention discloses a high corrosion-resistant Portland cement early strength agent and a preparation method thereof. The high corrosion-resistant Portland cement early strength agent comprises the following components in part by weight: 20-60 parts of gypsum, 10-20 parts of quicklime, 20-40 parts of sulfate, 10-30 parts of alcohol amine compound and 1-20 parts of calcium formate. The preparation method comprises the following steps: firstly uniformly mixing the gypsum, the quicklime, the sulfate, citrate and the calcium formate in a mixing machine in proportion, then adding the alcohol amine compound, grinding together in a vibrating mill and sieving to obtain the high corrosion-resistant Portland cement early strength agent. The high corrosion-resistant Portland cement early strengthagent and the preparation method thereof have the benefits that the targeted design is performed on a high corrosion-resistant Portland cement system, and the problem of no targeted early strength agent for existing high corrosion-resistant Portland cement is solved by the utilization of an inorganic and organic synergistic mechanism; in addition, the early strength agent does not contain corrosive ions such as chloride ions, has no influence on the use of the high corrosion-resistant Portland cement and can meet the needs of various erosion environments and construction conditions.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a high-corrosion Portland cement early strength agent and a preparation method thereof. Background technique [0002] Portland cement clinker is mainly composed of four mineral phases: tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite. In ordinary Portland cement clinker, the content of tricalcium silicate is about 60%, and the content of tricalcium aluminate is about 6%. The calcium hydroxide and calcium aluminate hydrate produced by these two mineral phases after hydration Hydration products such as calcium sulfoaluminate hydrate and hydrated calcium sulfoaluminate have poor thermodynamic stability and corrosion resistance, and it has been proved that it is difficult to adapt to the application in some erosive environments such as marine and saline-alkali, which greatly limits the application of Portland cement. Most wi...

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Problems solved by technology

At present, many types of early strength agents have been developed in my country, including sulfates, chloride salts, organic substances, carbonates, and composites. Most of the early strength agents are aimed at ordinary Portland cement systems, especially for Tricalcium silicate and tricalcium aluminate have a good hydration promotion effect, but for the high-corrosion Portland cement system, the early-strength promotion effect of the above-mentioned accelerators is obviously insufficient, and cannot well meet the needs of high-corrosion silicate cement systems. The demand for early strength of salt cement

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