摘要
通过试验确定了一种以硫铝酸盐水泥熟料为主要成分的低温施工用快硬水泥的配方,在5℃的低温环境下试验,结果表明该配方水泥不需添加任何外加剂,按普通混凝土常温施工方法进行施工养护,不需实施任何冬期施工措施,1d抗压强度可达拆除模板要求,后期强度能继续增长。该配方水泥在低温下正常快速硬化主要机理为:硅酸盐水泥熟料和生石灰能快速释放出Ca(OH)2,天然二水石膏能快速释放出CaSO4,Ca(OH)2和CaSO4与硫铝酸盐水泥熟料中的主要矿物4(CaO)·3(Al2O3)·SO3(无水硫铝酸钙)迅速反应生成大量的钙矾石,加上硫铝酸盐水泥低温水化硬化专用催化剂——亚硝酸钠的作用,水泥奖体快速硬化。天然硬石膏溶解速度比天然二水石膏缓慢,在天然二水石膏用尽之后与无水硫铝酸钙等继续发生水化反应,使水泥硬化体后期强度不断增长。
Determined a formula of which a sulfur aluminate cement clinker as the main ingredient and low temperature construction with rapid hardening cement by experiment. At 5℃ low-temperature environment test, the results show that the formulation of cement don＇t need to add any admixtures, Construction maintenance is used by Ordinary concrete construction method at room temperature, Don＇t need to implement any winter construction measures, ld compressive strength up to the removal of the template requirements and the late strength can continue to grow. The main mechanism of the formulation normal and rapid hardening cement at low temperatures： Portland cement clinker and quicklime rapid release of Ca （OH） 2, Natural dihydrate gypsum quick release CaSO4, Ca （OH） 2 and CaSO4 sulphoaluminate cement clinker mineral 4 （CaO） 3 （A1203） SO3 （anhydrous calcium sulphoaluminate） rapid responsegenerate large amounts of ettringite, Plus sulfur the aluminate cement hypothermia hydration hardened special catalyst - the role of sodium nitrite, the cement award is rapid hardening. The natural anhydrite dissolution rate slower than the natural dihydrate gypsum,after the exhaustion of natural dihydrate gypsum.To continue hydration reaction with Anhydrous calcium sulphoaluminate, Late strength of the hardened cement is growing.
出处
《大众科技》
2013年第1期37-38,25,共3页
Popular Science & Technology
关键词
硫铝酸盐水泥熟料
低温施工
强度
无水硫铝酸钙
水化
硬化
Sulphoaluminate cement clinker
cryogenic construction
strength
anhydrous calcium sulphoaluminate
hydration
sclerosis
