CAJ | 학술논문

石膏复合胶凝材料是由石膏与矿渣或粉煤灰、水泥等原材料配制而成的新型胶凝材料,水泥对其性能有很大影响,掺量过少不能有效激发矿渣活性,掺量过多易引起安定性不良.通过 pH 值测定和水化产物的 XRD 图谱并结合宏观试验结果,分析了水泥在石膏复合胶凝材料水化过程中的作用及机理.结果表明,水泥除自身水化外,主要为石膏复合胶凝材料体系提供钙离子和矿渣水化需要的碱性环境,能够加快矿渣活性的激发速度,缩短石膏复合胶凝材料的凝结时间;水泥掺量少,自身水化产物少且对矿渣激发不充分,不足以形成致密的网状结构,掺量过多,钙矾石生成量大,会因膨胀而破坏已形成的结构,导致强度和耐水性能降低;水泥的最佳掺量范围为7%~10%.
석고복합효응재료시유석고여광사혹분매회、수니등원재료배제이성적신형효응재료,수니대기성능유흔대영향,참량과소불능유효격발광사활성,참량과다역인기안정성불량.통과 pH 치측정화수화산물적 XRD 도보병결합굉관시험결과,분석료수니재석고복합효응재료수화과정중적작용급궤리.결과표명,수니제자신수화외,주요위석고복합효응재료체계제공개리자화광사수화수요적감성배경,능구가쾌광사활성적격발속도,축단석고복합효응재료적응결시간;수니참량소,자신수화산물소차대광사격발불충분,불족이형성치밀적망상결구,참량과다,개반석생성량대,회인팽창이파배이형성적결구,도치강도화내수성능강저;수니적최가참량범위위7%~10%.
? Gypsum composite binder was a new cementitious materials consisting of gypsum, slag or fly ash and cement, cement content had great effect on the performance of gypsum composite binder, too low content couldn’t stimulate the active of slag effectively, too much caused soundness problem. Therefore effect and mechanism of cement in gypsum composite binder hydration were analyzed by pH value of samples and XRD patterns of hydrated products as well as the results of macro experiment. The results showed that cement in addition to their own hydration mainly provided calcium and alkaline environment of slag hydration for gypsum composite binder systems and it could improve the speed of activating slag as well as shorten the setting time of gypsum composite binder. Low cement content couldn’t fully activate slag and generate enough hydration products to form a dense network structure, but the too much content produced a lot of ettringite and damaged the formed structure due to the expansion resulting in lower strength and water resistance. Under the conditions of this study, the best content of cement was 7% ~10%.