3D打印植生混凝土pH值的影响因素研究吕奇峰,陈安国,戴鹏飞(常州大学环境与安全工程学院,江苏常州213164)摘要:采用3D打印工艺,使用普通硅酸盐水泥(OPC)、硫铝酸盐水泥(SAC)、磷酸盐水泥(MPC)制备了3类24组不同配合比的植生混凝土试件,研究了水泥种类、水灰比、砂灰比、缓凝剂掺量等对植生混凝土pH值的影响规律。结果表明:水泥种类对植生混凝土pH值的影响最明显,掺OPC的植生混凝土的碱性最高,SAC次之,MPC最低;植生混凝土的pH值均随水灰比的增加而提高;砂灰比增加会降低植生混凝土的碱性;缓凝剂也会影响植生混凝土的pH值,其中,葡萄糖酸钠和酒石酸可以分别降低掺OPC或SAC的植生混凝土的pH值,而硼砂可以先降低后提高掺MPC的植生混凝土的pH值。关键词:3D打印混凝土;植生混凝土;碱性;硅酸盐水泥;硫铝酸盐水泥;磷酸盐水泥中图分类号:TU528.59文献标识码:Adoi:10.19761/j.1000-4637.2023.07.007.06StudyontheinfluencingfactorsonthepHvalueof3DprintedplantingconcreteLYUQifeng,CHENAnguo,DAIPengfei(SchoolofEnvironmentalandSafetyEngineering,ChangzhouUniversity,Changzhou213164,China)Abstract:Threetypesof24groupsofdifferentmixproportionsofplantingconcretespecimenswerepreparedby3DprintedprocesswithordinaryPortlandcement(OPC),sulphoaluminatecement(SAC)andphosphatecement(MPC).Theinfluenceofcementtype,water-cementratio,sand-cementratio,andretarderdosageonthepHvalueofplantingconcretewasstudied.TheresultsshowthatthetypeofcementhasthemostsignificantimpactonthepHvalueofplantingconcrete,plantingconcretemixedwithOPChavingthehighestalkalinity,followedbySAC,andMPChavingthelowest.ThepHvalueofplantingconcreteincreaseswiththeincreaseofwater-cementratio.Anincreaseinthesand-cementratiowillreducethealkalinityofplantingconcrete.TheretardercanalsoaffectthepHvalueofplantingconcrete,amongwhich,sodiumgluconateandtartaricacidcanrespectivelyreducethepHvalueofplantingconcretemixedwithOPCorSAC,whileboraxcanfirstreduceandthenincreasethepHvalueofplantingconcretemixedwithMPC.Keywords:3Dprintedconcrete;Plantingconcrete;Alkalinity;Portlandcement;Sulpho-aluminatecement;Magnesia-phosphatecement基金项目:国家自然科学基金项目(51908075)。0引言普通硅...