A special preservative for pozzolanic concrete

Abstract

The invention discloses a preservative special for pozzuolana concrete. The preservative is prepared from silica fume, coal ash, sodium carboxymethylcellulose, a water reducer, latex powder, polyvinyl alcohol and triethanolamine. The preservative is particularly prepared from the following raw materials in parts by weight: 90-110 parts of silica fume, 5-20 parts of coal ash, 0.6-1.0 part of sodium carboxymethylcellulose, 1.0-2.0 parts of the water reducer, 1.0-2.0 parts of redispersible latex powder, 1.0-2.0 parts of solid polyvinyl alcohol and 0.1-0.5 part of solid triethanolamine; and 10%-20% of the preservative is mixed into mortar or concrete according to the weight of pozzuolana. Compared with the prior art, the preservative has the advantages that a certain amount of triisopropanolamine is doped as a concrete early strength agent, compared with sulfate and chlorine salt early strength agents, triisopropanolamine has the advantages that triisopropanolamine can be well fit with additives and has stable early strength, and the setting time and the durability are not influenced, so that the early strength of the pozzuolana concrete can be effectively improved, and the durability of the concrete can be improved.

Description

technical field [0001] The invention relates to a special preservative for pozzolan concrete, in particular to a special preservative for pozzolan concrete. Background technique [0002] Volcanic ash refers to gravel and mineral particles with a diameter less than 2mm erupted by volcanoes. During explosive volcanic movements, solid rocks and lava are decomposed into fine particles to form volcanic ash. Volcanic ash is formed at high temperature, the process is similar to the sintering reaction in cement kiln, and because the chemical composition of pozzolan is similar to that of cement, both contain CaO, SiO 2 、Al 2 o 3 etc., so the volcano has a certain gelling activity. At room temperature, in the presence of water, it can react with Ca(OH) 2 reaction to generate reaction products such as calcium silicate hydrate, calcium aluminate hydrate or calcium sulfoaluminate hydrate. [0003] In the cement-pozzolanic system, cement hydration produces a large amount of Ca(OH) 2...

AI Technical Summary

Problems solved by technology

[0005] However, natural volcanic ash is loose and porous, has a large surface area, and strong adsorption. The concrete configured has a large water demand, rapid slump loss, poor adaptability to admixtures, low early strength, slow strength development, and insufficient durability. Only after improvement can it be used in various projects requiring high durability