水热固化工艺对固废基人造碎石性能的影响

Influence of Hydrothermal Curing Process on the Properties of Solid Waste Based Artificial Crushed Stone

关键词:  工程渣土  电石渣  水热固化  人造碎石  低场核磁共振

Key words:  engineering muck  carbide slag  hydrothermal curing  artificial crushed stone  low-field NMR

摘要:

以工程渣土、电石渣和脱硫石膏等固废为原料，利用水热固化技术制备固废基人造石材，探究水热固化条件对固废基人造石材力学性能和微观孔隙结构的影响规律；开展固废基人造石材的碎石化生产工艺试验，测定并分析了人造碎石与天然碎石物理性能的异同点.结果表明：固废基人造石材的抗压强度随着反应温度和时间的提升先增大、后减小，并随着成型干密度的增大和过筛最大粒径的减小而降低；湿土制样试件因物料结合接触面积不均，水热固化反应不够充分，其抗压强度低于干土制样试件；碎石生产工艺下，固废基人造碎石的吸水率约为21.2%，为天然碎石的4.7倍，压碎性指标约为27.1%，为天然碎石的3.8倍.

Abstract:

Using solid waste such as engineering musk， carbide slag， and desulfurization gypsum as raw materials， the solid-waste based artificial crushed stone was prepared through hydrothermal curing technology. The effect of hydrothermal curing conditions on the mechanical properties and microscopic pore structure of the artificial crushed stone was studied. Additionally， experiments on the crushed stone production process of the solid waste-based artificial crushed stone were conducted， and the physical properties of artificial crushed stone and natural crushed stone were measured and compared. The results showed that the compressive strength of the solid waste-based artificial crushed stone initially increased and then decreased with rising reaction temperature and time， while it decreased with increasing dry density and decreasing maximum particle size after sieving. Specimens prepared from wet soil exhibited lower compressive strength than those from dry soil due to uneven contact area and insufficient hydrothermal curing. Under the crushed stone production process， the water absorption rate of the solid waste-based artificial crushed stone was approximately 21.2%， 4.7 times that of natural crushed stone， and its crushing index was about 27.1%， 3.8 times that of natural crushed stone.