再生混凝土的早期抗压强度与弹性模量研究

Study on Early Compressive Strength and Elastic Modulus of Recycled Aggregate Concrete

再生混凝土的早期抗压强度和弹性模量对于该类结构施工期的安全性具有重要影响。选取试验龄期分别为1、3、7、142、1、28d,考察不同强度等级和不同再生骨料取代率再生混凝土早期抗压强度和弹性模量的发展规律。试验结果表明,再生混凝土的早期抗压强度和弹性模量较普通混凝土偏低,需要在施工期间采取相应措施,以保证再生混凝土结构施工的安全性。基于试验结果,建议了再生混凝土早期抗压强度和弹性模量的计算公式。在此基础上,进一步将研究成果应用于某再生混凝土刚性路面施工中,取得了良好的效果。

The mechanical properties of recycled aggregate concrete at early age are very important for the construction projects safety using this kind of material. In this paper, compressive strength and elastic modulus of recycled aggregate concrete at various ages were experimentally investigated, such as 1, 3, 7, 14, 21, 28d. The influence of strength grade and recycled concrete aggregate content was mainly focused. Test results indicate that the development of compressive strength and elastic modulus of recycled aggregate concrete at early age is slower than that of conventional concrete. Special attention must be paid during construction in order to ensure the construction safety. Based on the test results, calculation equations for compressive strength and elastic modulus of recycled aggregate concrete were proposed. The achievements have been applied in construction of a rigid pavement made of recycled aggregate concrete. Good results were achieved according to the early properties of recycled aggregate concrete.