レデーミクストコンクリートによるコールドジョイントの性質

概要

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The state of appearance, strength, water-permeability and carbonation of the concrete including cold joint which caused by ready-mixed concrete were investigated experimentally, and the following results were obtained. 1. The occurrence and properties of cold joint are affected by mixing time, time interval between layers, method of compaction when upper layer was placed, temperature and admixture (retarder). 2. The properties of cold joint are correlative to the proctor penetration resistance test value which was measured on under layer of concrete at the time when upper layer was placed. This value is advisable not to exceed 50g/(mm)^2 generally, and 10g/(mm)^2 for special case. 3. Judging from the above mentioned points of view, the haul time of ready-mixed concrete should be controlled strictly as a important factor which not only affects the concrete properties but also determines the concrete placing programme.
社団法人日本建築学会の論文
1967-05-30