摘要
用XRD ,SEM /EDAX和水泥净浆膨胀测定等方法对高镁中热水泥熟料 -石膏系统的双膨胀中热水泥进行了研究 ,得到 ( 1 )在熟料中明显地存在着相互分散的颗粒尺寸约为 5～ 7.5μm的方镁石颗粒 ;( 2 )双膨胀中热水泥强度和膨胀随SO3 含量的变化规律 ;( 3)该水泥充分利用了钙矾石膨胀和水镁石膨胀 ,在 2 8d龄期前主要依靠钙矾石膨胀 ,在 2 8d龄期后主要依靠水镁石膨胀 ;( 4 )在适当的SO3含量和MgO质量分数为 4 %～ 5%时 ,钙矾石膨胀和水镁石膨胀具有连续性、整体性和稳定性 .
The expansive mechanism of moderate heat portland cement with slight expansion (MHCSE)in the system of high MgO clinker-gypsum was studied by XRD,SEM/EDAX,strength and expansion measurements. Results indicate that periclase particles, whose size is 5—7.5 μm,is distributed separately in MHCSE clinker containing 4.8%MgO. The optimized SO 3 content is determined for high strength, appropriate expansion and expansive stabilization of MHCSE. For w (SO 3)= 2.8% —3.4% in cement and w (MgO)=4.0%—5.0% in clinker, the ettringite expansion and the brucite expansion in MHCSE paste are characterized by continuity,entirety and stabi_lization; At the age of 90 days the expansion of the paste has reached 700×10 -6 . The results suggest that mass concrete using this cement may compensate its temperature and autogenous shrinkage.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2000年第4期335-339,347,共6页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金!
中国长江三峡工程开发总公司资助!项目 ( 594 936 0 4 )
浙江省自然科学基金!资助项目( 5970 82 )
