基于堆积密实度的固废活性粉末混凝土配合比设计方法

Design method for mix proportion of solid waste activated powder concrete based on stacking density

采用固废掺合料(粉煤灰、矿渣和玻璃粉)进行了活性粉末混凝土(RPC)制备及性能研究,研究了固废种类、掺量和掺入方式对RPC堆积密实度、工作性能、力学性能和微观结构的影响,提出了固废RPC强度模型。结果表明:粉煤灰、矿渣和玻璃粉的替代水泥量分别为15%、10%~15%和20%时,RPC强度更具有优势,工作性能和微观性能更好;固废合理的掺入可使立方体抗压强度最高提高25.8%,而且随着堆积密实度的增大,固废RPC立方体抗压强度先提高后稍有降低;结合鲍罗米公式和密度堆积模型,考虑影响RPC性能的主要因素,提出了固废掺合料RPC配合比的设计方法,为RPC的工程应用提供依据。

The preparation and performance of reactive powder concrete(RPC) were studied by using solid waste admixtures(fly ash,slag and glass powder).The effects of solid waste type,dosage and mixing method on the compactness,working performance,mechanical properties and microstructure of RPC were studied,and the strength model of solid waste RPC was proposed.The results show that the replacement cement content of fly ash,slag,and glass powder is in the range of 15%,10% ~15%,and20%,respectively,which has advantages in strength,better working performance and better micro performance.The cube compressive strength of the solid waste RPC increased by a maximum of 25.8%.Moreover,with the increase of stacking density,the cube compressive strength of the solid waste RPC showed a trend of first increasing and then slightly decreasing.Combined with Bolomey formula and density accumulation model,considering the main factors affecting the performance of RPC,the design method of solid waste RPC mix proportion is proposed,which provides a basis for the engineering application of RPC.