Effect of the hydration temperature on the microstructure of Class G cement: C-S-H composition and density

被引：198
作者：
Bahafid, Sara [1 ,3 ]
Ghabezloo, Siavash [1 ]
Duc, Myriam [2 ]
Faure, Pamela [1 ]
Sulem, Jean [1 ]
机构：
[1] Ecole Ponts ParisTech, CNRS, IFSTTAR, Lab Navier,UMR 8205, Champs Sur Marne, France
[2] Univ Paris Est, Ifsttar, GERS SRO, Champs Sur Marne, France
[3] Ecole Ponts ParisTech, Lab Navier CERMES, 6-8 Av Blaise Pascal, F-77455 Champs Sur Marne, Marne La Vallee, France
来源：
CEMENT AND CONCRETE RESEARCH | 2017年 / 95卷
关键词：
hardened cement paste; microstructure; C-S-H; porosity; C-S-H density; CALCIUM-SILICATE-HYDRATE; TRICALCIUM SILICATE; PORTLAND-CEMENT; POROELASTIC PROPERTIES; CURING TEMPERATURE; PORE STRUCTURE; PASTES; PHASE; MODEL; CARBONATION;
D O I：
10.1016/j.cemconres.2017.02.008
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Curing temperature has a significant influence on cement paste microstructure and the properties of its principal hydrate C-S-H. In this paper, the effect of the hydration temperature in the range of 7 degrees C to 90 degrees C on the microstructure of a class G oil-well cement is studied. This is done by combining various experimental methods, including X-ray diffraction associated with the Rietveld analysis, thermo-gravimetric analysis, mercury intrusion porosimetry and porosity evaluation by drying. The experimental results show an increase of the capillary porosity and a decrease of the gel porosity by increasing the hydration temperature. This is attributed to a decrease of the C-S-H intrinsic porosity and a corresponding increase of the C-S-H density for higher curing temperatures. The experimental results are used in a simple analysis method to evaluate the density of C-S-H, as well as its C/S ratio and H/S ratio in dry and saturated conditions. The evaluated C-S-H density varies from 1.88 g/cm(3) at 7 degrees C to 2.10 g/cm(3) at 90 degrees C. The results also show a decrease of molar C/S ratio with increasing hydration temperature from 1.93 at 7 degrees C to 1.71 at 90 degrees C and of the H/S ratio from 5.1 at 7 degrees C to 2.66 at 90 degrees C. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码：270 / 281
页数：12
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