全轻混凝土基本力学性能试验研究

Experimental study on basic mechanical properties of full light-weight concrete

研究了水泥用量、水灰比、砂率对全轻混凝土立方体抗压强度、轴心抗压强度、劈裂抗拉强度、轴心抗拉强度和抗弯强度的影响。结果表明:全轻混凝土受压破坏形态为散体状、受拉断裂面平齐,呈现明显的脆性破坏特征;全轻混凝土的强度取决于水泥砂浆强度和陶粒强度的强弱,存在使全轻混凝土各强度指标达到最佳值的砂率、水泥用量和水灰比。与普通混凝土及采用轻粗骨料、普通砂的轻骨料混凝土不同,全轻混凝土的轴心抗压强度接近于其立方体抗压强度、轴心抗拉强度高于劈裂抗拉强度,对此需进一步系统研究。

The experiments were conducted to study the influences of cement content,water to cement ratio and sand ratio on the cubic com- pressive strength,axial compressive strength,splitting-tensile strength,axial-tensile strength and flexural-tensile strength of full light-weight con- crete composited with expanded-shale and light-weight sand.It is proved that the full light-weight concrete was failed as obvious brittleness in crushed state under compression and even breaking cross-section under tension.The full light-weight concrete strengths relied on which was larger between the strength of cement past and that of expanded-shale,there were optimum values of sand ratio,cement content and water to cement ratio to make the optimum values of every strengths of full light-weight concrete.For the full light-weight concrete,differently from the ordinary con- crete and the light-weight concrete only composed with light-weight coarse aggregate,the axial compressive strength was closed to the cubic com- pressive strength,and the axial-tensile strength was larger than the splitting-tensile strength,so that further studies should be conducted to clarify the mechanism or reasons.