經量콘크리트의 製造와 그 性質에 關한 硏究 = Studies on the Production and Property of Light Weight Concrete

다국어 초록 (Multilingual Abstract)

To study the effect of foaming agent on the production and property of light weight concrete, the tests of compressive, tensile, bending strengths and absorption rates of mortar were done under the different mixing ratio with J, A and D foaming agents.
The results obtained were summarized as follows :
1. The strengths were decreased in richer mixing ratio and more addition of foaming agent.
The decrease of strengths was the greatest at the level of 0.75% of foaming agent.
The decreasing rate of strengths was in order of J, A and D foaming agent.
2. At the mixing ratio of 1 : 1, σ_28 and 0.75% of foaming agent, the compressive strength was decreased up to 34.9% by D, 47.8% by A and 86,8% by J foaming agent, respectively, the tensile strength was decreased up to 14.8% by D, 20.2% by A and 77.9% by J foaming agent, respectively, bending strength was decreased up to 19.9% by D, 35.0% by A and 79.1% by J foaming agent, respectively.
The decrease of compressive strength was more severe than that of tensile and bending strengths.
3. The absorption rates were increased in poorer mixing ratio and more addition of foaming agent.
The absorption rate was significantly higher at the early stage of immersed water.
The absorption rate was in order of J, A and D foaming agent.
4. The decrease of strengths was inevitable in cement-mortar with foaming agent, but the cement mortar with foaming agent has such the properties of the light-weight, lnsulation, Keeping-warmth, sound proof and fire-proof that if could be utilized to the constructions which need low strengths.