温度变化对水泥土强度特性和破坏性状的影响

为研究温度对水泥土强度和破坏性状的影响,选用粘土和粉土这两种素土制成水泥土试样,分别在25°C±2°C、10°C±2°C和0°C±2°C的温度下进行养护,随后测试各龄期试样的单轴抗压强度,并观测各试样的破坏特征。研究表明:随着龄期的增长,温度变化对峰值应变的影响在减小;龄期较短(1~5天)时,水泥土单轴抗压强度对温度变化不敏感,在龄期7~40天,提高养护温度,水泥土单轴抗压强度显著增大;随着温度的升高,水泥土强度显著提高,但增长的趋势越来越缓慢;低温情况下水泥粘土的强度都比水泥粉土低,而一旦提高温度,水泥粘土的强度便超过水泥粉土;较低温度下养护的水泥土表现出比较明显的脆性破坏,迅速产生裂缝。

Effects of Temperature Fluctuation on Strength Characteristics and Destruction Characteristics of Cement-Stabilized Soils

In order to study effects of temperature fluctuation on strength characteristics and destruction characteristics of cement-stabilized soils,samples of cement-stabilized soils which are made of two kinds of plain soils are made with rate of contents plain soils: cement: water egual to 40:6:3 and are conserved under 25°C±2°C,10°C±2°C,0°C± 2°C,whereafter their uniaxial compressive strength are mensurated and their breakage characteristic are observed.The study′s findings indicate: influence of temperature fluctuation on peak strains decreases as the stadium increases;when the stadium(within 1~4 day) is shorter,the uniaxial compressive strength of cement-stabilized soils doesn′t vary markedly accompanying with temperature variety,while 7~40 day,advancing protected temperatures influences on their strength exaltation;accompanying with temperature heating up,the uniaxial compressive strength of cement-stabilized soils is rising obviously,while the trend of growth is more and more slow-moving;under the low temperature the uniaxial compressive strength of cement-stabilized clay is lower than the uniaxial compressive strength of cement-stabilized silt,but once the curing temperature rises,the uniaxial compressive strength of cement-stabilized clay will exceed the uniaxial compressive strength of cement-stabilized silt;under the low curing temperature cement-stabilized soils are apt to express obvious brittleness breakage and quick to produce cracks.