軽量コンクリートの耐硫酸塩性に関する二,三の考察

概要

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To examine the durability of artificial lightweight aggregate concrete under the action of sulphates, two kinds of artificial lightweight aggregate (Lionite and Mesalite) and normal weight aggregate (River sand and gravel), three kinds of cement (normal portland cement, blast furnace slag cement-B and C) have been selected and used with some combinations. Concretes with the above-mentioned aggregates and cements. having water cement ratio of about 40% and 55%, at ages of one and four weeks' immersion in sulphate solution (Na_2SO_4(20%)+MgSO_4 (20%), mixed 1 : 1) were prepared and compared with the control concrete (in standard curing) having the same sorts of cements and aggregates. The degree of deterioration were measured in reduction of dynamic modulus of elastisity by flexible frequency (specimens : 10×10×40 cm, by sonic apparatus), weight of specimens (10×10×40 cm) and compressive strength (φ10×20 cm) relative to control concrete respectively, over a period of one year. The test results show that artificial lightweight concrete have indicated the same good resistance and soundness to chemical attack of sulphate as normal concrete, and the damage of specimens made from lightweight concrete under action of sulphates is observed to be smaller than in normal concrete, even after one year's or 15 months immersion.
社団法人日本材料学会の論文
1969-02-15