固硫灰渣泡沫混凝土制备与性能研究

Preparation and Properties Study of Foamed Concrete with CFBC Ash/Slag

摘要: 以水泥、固硫灰、渣为主要原料，采用物理发泡的方式制备泡沫混凝土。通过正交试验研究了固硫渣掺量、水泥掺量、水料比、泡沫添量对制品干密度及抗压强度的影响，确定了最优的配合比方案。基于正交试验确定的配合比方案，研究了固硫渣颗粒集配、养护制度对制品抗压强度的影响。通过优化固硫渣颗粒集配、采用40℃恒温养护的方式，对制品抗压强度分别提升72%与59%。在实验室条件下，按照固硫渣：水泥：固硫灰 = 50:35:15、水料比0.36、泡沫添加量1.6L进行配合比设计，调整固硫渣颗粒集配为(6~0.3 mm):(0.3~0.125 mm):(<0.125 mm) = 65:25:15，选用40℃恒温养护、养护14 d，制备出A06级泡沫混凝土，抗压强度达3.83 MPa，固废利用率高达65%。

Abstract: Using cement, CFBC ash and slag as the main raw materials, foam concrete was prepared by physical foaming. Through orthogonal experiments, the effects of CFBC slag content, cement content, water-to-material ratio and foam content on the dry density and compressive strength of the product were studied, and the optimal mix ratio scheme was determined. Based on the mix ratio scheme determined by the orthogonal experiment, the influence of the combination and curing system of sulfur-fixing slag particles on the compressive strength of the product was studied. By optimizing the distribution of solid sulfur slag particles and adopting the method of 40˚C constant temperature curing, the compressive strength of the products is increased by 72% and 59% re-spectively. Under laboratory conditions, we design the mix ratio according to the CFBC slag: cement: CFBC ash = 50:35:15, the water to material ratio 0.36 and the foam addition amount 1.6 L, and adjust the concentration of CFBC slag particles to (6 - 0.3 mm):(0.3 - 0.125 mm):(<0.125 mm) = 65:25:15, choose 40˚C constant temperature curing for 14 d, prepare A06 foam concrete. The compressive strength is 3.83 MPa, and the solid waste utilization rate is as high as 65%.