Hydration kinetics and strength retrogression mechanism of silica-cement systems in the temperature range of 110?C-200?C

被引：33

作者：

Sun, Lijun ^{[1
]}

Pang, Xueyu ^{[1
,2
]}

Ghabezloo, Siavash ^{[3
]}

Wang, Haige ^{[4
]}

Sun, Jinsheng ^{[1
,2
]}

机构：

[1] China Univ Petr East China, Sch Petr Engn, Qingdao 266580, Peoples R China

[2] China Univ Petr East China, Key Lab Unconvent Oil & Gas Dev, Minist Educ, Qingdao 266580, Peoples R China

[3] Univ Gustave Eiffel, Ecole Ponts, Navier, CNRS, Marne La Vallee, France

[4] CNPC Engn Technol R&D Co Ltd, Beijing 102206, Peoples R China

来源：

CEMENT AND CONCRETE RESEARCH | 2023年 / 167卷

基金：

中国国家自然科学基金;

关键词：

High temperature; Silica -cement system; Heat of hydration; Chemical shrinkage; Strength retrogression; OIL-WELL CEMENT; CHEMICAL SHRINKAGE; EVOLUTION; PRESSURE; PHASE;

D O I：

10.1016/j.cemconres.2023.107120

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

A comprehensive investigation of silica-cement hydration kinetics and engineering properties in the temperature range from 110 degrees C to 200 degrees C and pressure range from 25 MPa to 50 MPa were conducted by isothermal calo-rimetry, chemical shrinkage, and ultrasonic cement analyzer. Test results revealed that the effect of curing temperature on the hydration kinetic profiles is very complex, while the influence of pressure is relatively evident. The heat of hydration of the silica-cement system is approximately proportional to chemical shrinkage and the proportionality constant is invariant with curing temperature. Strength retrogression of silica-cement systems is caused by the transformation of amorphous C-S-H to xonotlite and tobermorite and is accompanied by volume expansion possibly due to the conversion of chemically bound water to free water. Increasing curing pressure can accelerate the volume expansion and phase transformation process during early age, while increasing silica dosage can significantly slow down such process.

引用

页数：16

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