A kind of cement-based infiltration crystallization composite active powder masterbatch for tunnel construction and preparation method thereof

Abstract

The invention discloses a cement-based permeable crystal composite active powder masterbatch for tunnel construction and a preparation method thereof. The active ingredients are prepared from the following raw materials in weight percentage: malic acid-oxalic acid 7.5%-12.5%, methyl 5.0% to 10.0% of sodium silicate, 20% to 30% of modified silicone oil and 50% to 67% of alkali metal silicate solution; the sum of the weight percentages of the above raw materials is 100%; wherein: the malic acid-oxalic acid It is a mixture of malic acid and oxalic acid, and the mass ratio of malic acid and oxalic acid is 1:3 to 3:1; the alkaline metal silicate solution is Na 2 SiO 3 , Na 2 SO 4 Mixture with water, Na 2 SiO 3 , Na 2 SO 4 The mass ratio with water is (4~2):(3~1):3. The cement-based infiltrating crystalline material for tunnel construction prepared with cement-based infiltrating crystallization composite active powder masterbatch, both the 28-day flexural strength and the 28-d compressive strength of mortar meet GB18445‑2012, and the performance is excellent.

Description

technical field [0001] The invention belongs to the technical field of tunnel waterproof materials, and in particular relates to a cement-based permeable crystalline composite active powder masterbatch for tunnel construction and a preparation method thereof. Background technique [0002] Cement-based infiltrating crystalline material is a new type of waterproof material, which not only belongs to the inorganic material system, but also has greater compatibility with the cement concrete system, and has excellent waterproof performance. The core of cement-based infiltration crystallization material is active masterbatch. At present, ordinary cement-based infiltration and crystallization active masterbatch has poor workability in tunnels with high humidity and backwater, that is, insufficient impermeability and mechanical properties; and active masterbatch cannot achieve full powder. It means that there are liquid functional reagents such as penetrants and activators, that is,...

AI Technical Summary

Problems solved by technology

The core of the cement-based osmotic crystalline material is the active masterbatch. At present, the common cement-based osmotic crystalline active masterbatch has poor workability in the high humidity of the tunnel and the backwater surface, that is, the impermeability and mechanical properties are insufficient; and the active masterbatch cannot be fully powdered. Chemicalization, that is, there are liquid functional reagents such as penetrants and activators, that is, the mixing process of liquid and powder is complicated, and the mixture of liquid and powder is inconvenient to store.

Images