再生混凝土的长期力学性能试验研究

为了保证再生混凝土结构的工程质量和安全性,需要对再生混凝土的长期力学性能作出准确评价。基于这一工程需要,系统对不同强度等级的再生混凝土的抗压强度、劈裂抗拉强度和抗折强度以及弹性模量随时间的发展规律进行研究。结合试验结果对再生混凝土上述各长期力学性能的变化规律给予分析,并对普通混凝土长期力学性能计算方法对再生混凝土的适用性进行考察。试验结果表明:再生混凝土的长期抗压强度与普通混凝土存在一定的差异,主要表现为强度和弹性模量随龄期增长较多,发展相对较快。普通混凝土长期力学性能计算公式不适用于再生混凝土。基于试验结果,提出再生混凝土长期力学性能计算方法。

LONG-TERM MECHANICAL PROPERTIES OF RECYCLED AGGREGATE CONCRETE

The long-term mechanical properties of recycled aggregate concrete(RAC) are of great importance for insuring the construction quality and safety of buildings made with this material.For this reason,the development of mechanical properties of RAC of different strength grades over time was extensively investigated,mainly including the compressive strength,the tensile splitting strength,the flexural strength and the modulus of elasticity.The changing law of the long-term mechanical properties of RAC was analyzed and the adaptability of the predict method for the long-term mechanical properties of conventional concrete to RAC was evaluated.The test results indicated that the developments of the mechanical properties of RAC over time are different from that of conventional concrete.Higher strength and modulus of elasticity gain were observed for RAC.The predict methods for the long-term mechanical properties of conventional concrete are not suitable for RAC.Based on the test results in this paper,alternative predicting methods for the long-term mechanical properties of were proposed.