Abstract
Six kinds of stones, which are expansible by heat, were tesed and the heat expansion characters were obtained in stone itself and tile specimens made with the crashed stones. Shale was found to be the most preferable to make aggregate, however it had tittle surface melting and released its foam near surface. In order to improve this quality, the authors carried out the experiments on 18 mixes of clay, pottery stone and shale. The mixing of shale and pottery stone in 90 : 10 was found as the best among them. An aggregate was made with the conbination. The main results obtained on the aggregate were as follows : The specific gravity was 1.6-1.8. The water absorption was 0.8% in 24 hours. The strength of the gravel was greater than that of an artificial aggregate found on the market (A.L.A.) according to the plunger tests. When the A.L.A. gravel in concrete was replaced by the new aggregate : The weight increase of 8% resulted. The tensile strength and the increase rate in compressive strength to c/w ratio became lower. The higher compressive strength was achieved when c/w ratio was under 2.0. The water avsorption, water permeation and drying shrinkage in length became amaller. The modulus of elasticity showed higher value and it was the same as that of the river gravel concrete.
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