Relationships between strength, deformation and age of autogenously healed concretes : Dhir, R Sangha, CM Munday, JG 7F, 7T, 14R. Quarry Management and Prods. V1, N3, Aug. 1974, P93–99

Abstract

The authors describe an investigation on the autogenous healing of mortars subjected to strength failure. The effects of water/cement and aggregate/cement ratios on the healing process were studied. Six concretes, made with 3 types of crushed igneous coarse aggregate, and cured in humid conditions, formed the cylindrical test specimens. 367 tests were conducted using a constant strain rate of 1 X 1/100000/s to give controlled loading up to the maximum stress of 50 n/square mm. The influence of mix design and age was considered. Test ages were 7, 28, 60, 120 and 240 days. The authors concluded that (1) full recovery of concrete strength after fracturing to maximum stress is possible for all ages investigated and is unrelated to aggregate type and mix proportions; (2) full recovery of the 50% tangent modulus was possible only after initial testing at 7 days; (3) healed concrete exhibits brittle behaviour with a reduced ultimate strain at failure. /TRRL/