干燥与潮湿环境下混凝土抗压强度和弹性模量发展分析

摘要

The compressive strength and elastic modulus of C30, C50 and C80 concretes cured in moisture and drying environments respectively at typical ages were measured to investigate the effect of curing conditions. The results show that drying conditions reduce the concrete＇s compressive strength and elastic modulus. The development history of strength and elastic modulus was modeled by both maturity method and hydration degree concept. A modified method based on hydration concept was proposed to predict the effect of interior moisture content on the strength and the elastic modulus of concrete. The model predictions on strength and elastic modulus of concrete under different curing conditions agree well with experimental resuits. In addition, two models describing the relationship between compressive concrete strength and elastic modulus were analyzed with obtained experimental data, which indicates that it is not reasonable to calculate modulus of normal and high performance of concrete with strenzth values bv fixed 13arameter models.%试验测量了C30、C50、C80混凝土在标准养护和自然干燥环境下典型龄期的轴心抗压强度和抗压弹性模量，结果表明干燥条件下混凝土的抗压强度和弹性模量普遍降低。采用成熟度法和水化度法分析了混凝土强度和弹模发展规律；分析了内部湿度对混凝土水化速率的影响机理，建立了湿度影响水泥水化度、进而影响强度和弹性模量的计算修正模型；模型结果与试验结果对比，二者吻合良好。最后对比分析了两种混凝土弹模一强度关系模型，结果表明对于普通与高强混凝土采用统一的模型参数不可取。