复掺煅烧硅藻土的玻化微珠再生混凝土力学性能 #br#

为配制满足强度要求的玻化微珠再生混凝土，试验研究了多种不同玻化微珠掺量下，复掺煅烧硅藻土后的混凝土基本力学性能，并对结果进行了总结分析。试验结果表明：对于再生粗骨料本身客观存在的宏观裂缝，煅烧硅藻土有填充的效果，且对于再生混凝土的力学性能有明显的改善作用；随着玻化微珠掺量的增加，再生混凝土的表观密度、抗压强度、劈裂抗拉强度与弹性模量均呈现明显的降低趋势，当煅烧硅藻土掺量为3%，玻化微珠颗粒掺加量为100%时，再生混凝土的表观密度仅为1943.6kg/m3，其立方体抗压强度仍能达到32.55 MPa；在试验分析基础上，提出了玻化微珠再生混凝土轴心抗压强度fc与立方体抗压强度fcu的线性关系式。

Mechanical Properties of Vitrified Micro Bubbles Recycled Concrete Mixed with Calcined Diatomite

In order to prepare recycled concrete with vitrified micro bubbles to meet the strength requirements, the basic mechanical properties of concrete mixed with calcined diatomite with different vitrified micro bubbles contents were studied experimentally, and the results were summarized and analyzed. The experimental results show that: Calcined diatomite can fill the macroscopic cracks of reclaimed coarse aggregate and improve the mechanical properties of recycled concrete; With the increasing of vitrified micro bubbles, the apparent density, compressive strength, splitting tensile strength and elastic modulus of recycled concrete all show an obvious decreasing trend. When the content of calcined diatomite is 3% and the content of vitrified micro bubbles is 100%, the apparent density of recycled concrete is only 1943.6kg/m3, and its cubic compressive strength can still reach 32.55 Mpa; On the basis of experimental analysis, a linear relationship between the axial compressive strength fc of vitrified micro bubbles recycled concrete and the cubic compressive strength fcu is proposed.