Compound activator and geopolymer cement concrete prepared from same

Abstract

The invention provides a compound activator. The compound activator comprises triethanolamine, a naphthalene water reducer, quartz powder and lime milk. The invention further provides geopolymer cement concrete prepared from the compound activator. The geopolymer cement concrete comprises a binding material, an aggregate and the compound activator; by the geopolymer cement concrete per cubic meter, the addition amount of the binding material is 510-650kg, the addition amount of the aggregate is 1410-1550kg, the specific value of the addition amounts of the compound activator and the binding material is (0.22-0.35):1, the water-binder ratio is 0.35-0.37, and the sand ratio of the aggregate is 25-35%; and the binding material comprises one or more of metakaolin, slag powder and pulverized fuel ash, and the aggregate comprises sand and cobbles. The geopolymer cement concrete provided by the invention is low in cost, can be maintained at a normal temperature and has the advantages of high strength, high volume stability and durability, so that the geopolymer cement concrete can be widely applied to building fields such as civil engineering, highways and bridges instead of common Portland cement.

Description

technical field [0001] The invention relates to a geopolymer concrete and a preparation method thereof, belonging to the technical field of concrete engineering. Background technique [0002] Geopolymer materials are one of the most active research materials in the world in recent years. It uses clay, industrial waste residue or slag as raw materials, and adopts appropriate process to obtain inorganic silicon-oxygen tetrahedron and aluminum-oxygen tetrahedron through chemical reaction under low temperature conditions (50~180°C). Structured inorganic polymer materials. Geopolymers have high early strength, low shrinkage, freeze-thaw resistance, sulfate corrosion resistance, and acid and alkali corrosion resistance. They are widely used in new building decoration materials, refractory insulation materials and early-strength cementitious materials, and can replace metals. , ceramics, etc. are used in high-strength structural materials, nuclear waste solid sealing materials an...

AI Technical Summary

Problems solved by technology

However, in the above-mentioned technology, sodium silicate and sodium hydroxide are still used as alkali stimulators, so it does not solve the problem of high alkali content in geopolymer concrete, and there are still occurrences after adding recycled coarse aggregate and recycled fine aggregate. The potential risk of alkali-aggregate reaction makes this geopolymer concrete unable to replace ordinary conventional cement concrete for civil engineering, bridges and other construction fields

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