Hydration heat evolution and kinetics of blended cement containing steel slag at different temperatures

被引：210

作者：

Han, Fanghui ^{[1
,2
]}

Zhang, Zengqi ^{[1
]}

Wang, Dongmin ^{[2
]}

Yan, Peiyu ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Civil Engn, China Educ Minist, Key Lab Civil Engn Safety & Durabil, Beijing 100084, Peoples R China

[2] China Univ Min & Technol Beijing, Beijing, Peoples R China

来源：

THERMOCHIMICA ACTA | 2015年 / 605卷

基金：

中国国家自然科学基金;

关键词：

Steel slag; Blended cement; Hydration heat; Kinetics; EARLY-STAGE HYDRATION; PORTLAND-CEMENT; LIMESTONE; BINDER;

D O I：

10.1016/j.tca.2015.02.018

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Hydration heat characteristics of blended cement containing up to 50% steel slag were studied at 25 degrees C, 45 degrees C and 60 degrees C by isothermal calorimeter. Kinetics equations were used to explore kinetics of blended cement. Kinetics parameters, n,K, and E-a, were calculated and analyzed. Results indicated that the activity of steel slag was very low. Steel slag accelerated the hydration of aluminates but decelerated the hydration of silicates in cement clinker. Small amount of steel slag affected little the hydration process of cement. Elevated temperature obviously promoted the hydration of blended cement. The hydration of blended cement containing no more than 35% steel slag was controlled by nucleation of hydrates in acceleration period and by diffusion of ions in decay period. The hydration of blended cement containing 50% steel slag was mostly dominated by phase boundary reaction, then directly by diffusion. Er, increased with increasing steel slag content. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：43 / 51

页数：9

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