自燃煤矸石粗集料对砂轻混凝土性能影响的试验研究

Experimental Study on the Influence of Spontaneous Combustion Gangue Coarse Aggregate on Sand Lightweight Concrete Performance

自燃煤矸石粗集料特性对混凝土性能影响是自燃煤矸石砂轻混凝土主要研究内容之一，对实际应用有着重要意义。试验选取代表自燃煤矸石粗集料特性的砂率、颗粒级配和附加用水量为影响因素，选择3因素、5水平的正交设计对自燃煤矸石砂轻混凝土进行试验研究，分析各因素对自燃煤矸石砂轻混凝土拌合物工作性、硬化强度及抗冻和抗氯离子渗透性能的影响。结果表明：当砂率为0．44、自燃煤矸石粗集料颗粒级配范围为（5—10mm）：（10—15mm）：（15～20mm）=7：47：46以及附加用水量为24h饱和吸水率的78％时，在拌合物获得大流动性同时，强度等级满足C25、抗冻等级满足FS0、抗氯离子渗透等级满足Ⅲ级的设计要求。研究结果为轻集料砂轻混凝土的配合比设计提供了基础。

The influence of spontaneous combustion gangue coarse aggregate specificity on sand lightweight concrete performance is one of the main research contents of spontaneous combustion gangue sand lightweight concrete, and is of great importance to practical. Choose sand ratio, grain composition range and additional water consumption what can represent spontaneous combustion gangue coarse aggregate specificity as influence factors and 3 factors, 5 levels orthogonal design to study spontaneous combustion gangue sand lightweight concrete,then analyse the influence of various factors on spontaneous combustion gangue sand lightweight concrete mixing material workability, hardening strength, antifreeze and chloride-permeation resistance performance. The results show ： when sand ratio is 0.44, pontaneous combustion gangue coarse aggregate grain composition range is （5 ~ 10 mm） ： （ 10 ~ 15 ram） ： （ 15 ~ 20 mm） = 7：47：46 as well as additional water consumption is 78% of 24 h saturated water uptake rate, as the same time mixing material fluidity is maximum, strength grade meets C20, antifreeze grade meets F50, chloride-permeation resistance grade meets Ⅲ grade, all these meet test design requirements. The results provide some foundation to the mix design of lightweight aggregate sand lightweight concrete.