长龄期自密实混凝土弯拉应变特征研究

Flexure tensile cracking strain (FTCS) was investigated by adopting flexure tensile test at 3d-560d. The testing mixes involved C35-C50 self-compacting concrete (SCC) and normal vibration concrete (NVC). Equation of FTCS with age was established, and limit value of FTCS and relevant characteristic age were attained through the equation. Basing on test data, relation between FTCS and ratio of flexure tensile strength (compressive strength) and elastic modulus was studied. The investigation shows that development law of SCC FTCS with age is similar to NVC’s, both submit to negative exponent. Proportional coefficient of FTCS and flexure tensile strength or compressive strength to elastic modulus ratio for SCC and NVC both tend to fixed value.