ゴムラテックス混入超速硬セメントモルタルの研究

抄録

The latex-modified ultra rapid hardening cement mortars were composed of aggregates, ultra rapid hardening cement and latex. The latex as a modifier for normal portland cement is apt to be destroyed its protective colloidal layer around the polymer particle surface, and then to form the coagulation of polymer whenever it is attacked by a mechanical operation, a thermal operation and polyvalant positive ion such as Ca⁺, Al³⁺ in liquid phase with ultra rapid hardening cement paste. Specially the positive ion, Al³⁺ ion concentration of the liquid phase with ultra rapid hardening cement paste is remarkably larger than that of the normal portland cement paste. In order to settle these problems, it is necessary to add surfactants and antifoarmer to the latex for the normal portland cement. The author, first of all, introduces the recipe for special SBR (Styrene-butadine rubber) latex containing surfactant as a modifier in ultra rapid hardening cement as a result of the mechanical stability test, the chemical stability test, the strength test and the water-proofing test. This paper describes the properties such as strengths, drying shrinkage, water-proofing property and abrasion resistance of the special SBR latex modified ultra rapid hardening cement mortars at various polymer cement ratio.