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

被引：187

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

页码：270 / 281

页数：12

共 81 条

[61] The calcium silicate hydrates
Richardson, I. G.
[J]. CEMENT AND CONCRETE RESEARCH, 2008, 38 (02) : 137 - 158
[62] Model structures for C-(A)-S-H(I)
Richardson, Ian G.
[J]. ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE CRYSTAL ENGINEERING AND MATERIALS, 2014, 70 : 903 - 923
[63] The nature of C-S-H in hardened cements
Richardson, IG
[J]. CEMENT AND CONCRETE RESEARCH, 1999, 29 (08) : 1131 - 1147
[64] Tobermorite/jennite- and tobermorite/calcium hydroxide-based models for the structure of C-S-H:: applicability to hardened pastes of tricalcium silicate, β-dicalcium silicate, Portland cement, and blends of Portland cement with blast-fumace slag, metakaolin, or silica fume
Richardson, IG
[J]. CEMENT AND CONCRETE RESEARCH, 2004, 34 (09) : 1733 - 1777
[65] MODELS FOR THE COMPOSITION AND STRUCTURE OF CALCIUM SILICATE HYDRATE (C-S-H) GEL IN HARDENED TRICALCIUM SILICATE PASTES
RICHARDSON, IG
GROVES, GW
[J]. CEMENT AND CONCRETE RESEARCH, 1992, 22 (06) : 1001 - 1010
[66] Dehydration of Ca3Al2(SiO4)y(OH)4(3-y) (0<y<0.176) studied by neutron thermodiffractometry
Rivas-Mercury, J. M.
Pena, P.
de Aza, A. H.
Turrillas, X.
[J]. JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 2008, 28 (09) : 1737 - 1748
[67] Saout G. L., 2007, 12 INT C CHEM CEM
[68] SAUMAN Z., 1971, CEMENT CONCRETE RES, V1, P645, DOI [DOI 10.1016/0008-8846(71)90019-6, 10.1016/0008-8846(71)90019-6]
[69] Scrivener K., 2016, A practical guide to microstructural analysis of cementitious materials, V540, DOI 10.1201/b19074
[70] Hydration of cementitious materials, present and future
Scrivener, Karen L.
Nonat, Andre
[J]. CEMENT AND CONCRETE RESEARCH, 2011, 41 (07) : 651 - 665

← 1 2 3 4 5 6 7 8 9 →