早強制レジンモルタルの耐水配合
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概要
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The mechanical properties of unsaturated-polyester resin mortar is adversely affected by water when it hardens. This is a serious problem when it is applied as cast-in-place mortar, because in a field work there are few places where water can completely be eliminated. The demand for the cast-in-place resin mortar, however, is becoming greater. Therefore, the decrease in strength of resin mortar caused by water must be solved. Two kinds of effect of water have been proposed. (1) When resin mortar is placed or joined in water, it occludes water. This occluded water decreases the mechanical strength of resin mortar by abstracting the complete adhesion between resin and aggregate. (2) Aggregate for resin mortar is required to be completely dry. Water content of aggregate is usually kept less than 0.3%. In this paper, aggregate was treated with silane coupling agent in order to minimize the influence of water. Three kinds of silane coupling agents, γ-methacryloxypropyl trimethoxysilane, vinyltriethoxysilane and vinyltris (β-methoxyethoxy) silane were used. The results are as follows: (a) When the resin mortar made of untreated aggregate had been molded in water, it showed 13% lower tensile strength than that which was hardened in air, while the resin mortar made of treated aggregate preserved the strength as much as 95%. (b) As for the tensile strength of the joint, the rein mortar made of untreated aggregate showed 40% lower strength than that which was joined in air, and more than 88% of the strength could be preserved with the resin mortar made of treated aggregate. (c) The effect of water content in aggregate on the tensile strength of the resin mortar was examined. The resin mortar made of untreated aggregate showed a steep strength drop even at small water content. The resin mortar made of treated aggregate showed only a mild strength drop even up to 10% water content.
- 社団法人日本材料学会の論文
- 1974-08-15