碱矿粉无机聚合物混凝土的制备及性能研究

Manufacturing Process and Properties of Alkali-Slag Mineral Polymer Concrete

以矿粉为原料,掺入Na2SiO3和NaOH复合激发剂,制备了大流动度、早强高强无机聚合物混凝土(MPC).探讨了MPC的制备工艺及矿粉用量、溶胶比对MPC性能的影响规律,并通过烧失量试验、SEM和EDS分析了MPC各龄期的水化程度、微观结构及强度机理.结果表明:激发剂显著提高了矿粉的活性,MPC水化1d后其水化程度已达52%,并随龄期的延长逐渐加大;MPC水化产物和结构较密实,浆体中C-S-H凝胶、碱性铝硅酸盐水化物和沸石型矿物含量较多,Ca(OH)2含量显著降低,晶体的整体性提高,胶结料和集料的界面强度较大;MPC28d抗折、抗压强度最高分别达8.51,91.9MPa,且强度发展较快,7d抗折、抗压强度最高分别达7.59,84.8MPa,且各龄期的强度均随矿粉用量或溶胶比的提高而降低;各制备参数对MPC工作性影响程度为:矿粉用量>溶胶比>砂率,在其他条件相同时,MPC坍落度随着矿粉用量或溶胶比的增加而增加,能达到160mm以上.

By adding Na2SiO3 and NaOH complex activator in slag,high fluid and high-early strength mineral polymer concrete（MPC） was prepared.The manufacturing technic and effect of dosage of slag,mA/mS on the properties o f MPC were studied.Degree of hydration and microstructure,strength mechanism o f MPC were investigated by loss of calcination test,SEM and EDS.The results show that activity of slag is enhanced by activator,the degree of hydration reach es 52% after 1d,and increases with the prolongation of hydration time;The mechanical property of MPC is improved by its denser structure and hydration products,high content of C-S-H gel and alkaline aluminate-silicate,zeolite hyd ration products,unitarier crystals,high interfacial strength between cementitious material and aggregate;28 d flexural strength and compressive strength o f MPC are 8.51 MPa,91.9 MPa,7 d strength are 7.59 MPa and 84.8 MPa,and strength decreases with increase of dosage of slag or mA/mS ;Extent of effect of parameters on the workability of MPC in file are：dosage of slagmA/mSsand percentage,slump of MPC increases with the increase of dosage of slag or mA/mS,which can reach upwards 160 mm.