摘要
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%。
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%.
出处
《非金属矿》
CAS
CSCD
北大核心
2013年第1期46-49,共4页
Non-Metallic Mines
基金
"十二五"国家科技支撑计划项目(2011BAE14B06-03)
关键词
石膏复合胶凝材料
抗压强度
钙矾石
软化系数
水化机理
gypsum composite binder compressive strength ettringite softening coefficient hydration mechanism
