工业废渣复合胶凝材料泡沫轻质土制备及性能

为促进工业废渣资源化循环利用,制备工业废渣复合再生胶凝材料(RC)及相应泡沫轻质土。利用松香树脂类、蛋白类两种发泡剂和表面活性剂经高速剪切混溶制备复合类发泡剂,通过不同发泡剂种类、搅拌转速和搅拌时间下的RC泡沫土流动度、湿密度和抗压强度优选最佳工艺,不同湿密度和龄期下抗压强度对比RC泡沫土和水泥泡沫土力学性能,干缩和冻融循环试验对比RC泡沫土和水泥泡沫土耐久性,借助XRD分析RC泡沫土成分。结果表明,复合类发泡剂融合了松香树脂类发泡剂稳定性好和蛋白类发泡剂发泡倍数高的优势,RC泡沫土制备过程最佳搅拌转速为200 r/min,搅拌时间为2 min。RC和水泥两种泡沫土流动度均满足规范要求,初期抗压强度相当;随着龄期增加,RC泡沫土强度增长幅度高于水泥泡沫土,28 d和56 d龄期时RC泡沫土强度为水泥泡沫土强度的1.21倍和1.35倍。相同条件下RC泡沫土抗干缩和抗冻融性能优于水泥泡沫土。RC水化产物中增加了钙矾石,且水化硅酸钙含量高于水泥水化产物。

Preparation and Properties of Industrial Waste Residue Composite Cementitious Foamed Lightweight Soil

In order to promote the resource recycling of industrial waste residues, the industrial waste residues composite cementitious material (RC) and the corresponding foamed lightweight soil was prepared. The composite foaming agent was prepared by mixing rosin resin and protein foaming agents and surfactants by high-speed shear. The optimum process was optimized based on the fluidity, wet density and compressive strength of RC foamed soil with different foaming agents, stirring speed and stirring time. The mechanical properties of RC foamed soil and cement foamed soil were compared based on compressive strength at different wet densities and ages. The durability of RC foamed soil and cement foamed soil was compared based on dry shrinkage test and freeze-thaw cycle test. The composition of RC foamed soil was analyzed by XRD. The results show that the composite foaming agent combines the advantages of good stability of rosin resin foaming agent and high foaming multiple of protein foaming agent. The optimum stirring speed is 200 r/min and the stirring time is 2 min for the preparation of RC foamed soil. The fluidity of the two kinds of foamed soil of RC and cement meet the requirements of the specification, and the initial compressive strength is equivalent.With the increase of age, the growth of RC foamed soil strength is higher than that of cement foamed soil. At 28 d and 56 d, the strength of RC foamed soil is 1.21 times and 1.35 times of the corresponding strength of cement foamed soil respectively.The dry shrinkage and freeze-thaw resistance of RC foamed soil are better than those of cement foamed soil in the same condition. Compared with cement hydration products, RC hydration products contain newly added ettringite and higher content of hydrated calcium silicate.