Effect of Curing Regime on Degree of Al3＋ Substituting for Si4＋ in C-S-H Gels of Hardened Portland Cement Pastes
The effect of curing regime on degree ofAl3＋ substituting for Si^4＋ （Al/Si ratio） in C-S-H gels of hardened Portland cement pastes was investigated by 29Si magic angel spinning （MAS） nuclear magnetic resonance （NMR） with deconvolution technique. The curing regimes included the constant temperature （...
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| Published in | Journal of Wuhan University of Technology. Materials science edition Vol. 29; no. 3; pp. 546 - 552 |
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| Main Authors | , , , , |
| Format | Journal Article |
| Language | English |
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Wuhan University of Technology
01.06.2014
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| Abstract | The effect of curing regime on degree ofAl3＋ substituting for Si^4＋ （Al/Si ratio） in C-S-H gels of hardened Portland cement pastes was investigated by 29Si magic angel spinning （MAS） nuclear magnetic resonance （NMR） with deconvolution technique. The curing regimes included the constant temperature （20, 40, 60 and 80 ℃） and variable temperature （simulated internal temperature of mass concrete with 60 ℃ peak）. The results indicate that constant temperature of 20 ℃ is beneficial to substitution ofAl3＋ for Si4＋, and AI/Si ratio changes to be steady after 180 d. The increase of Al/Si ratio at 40 ℃is less than that at 20℃ for 28 d. The other three regimes of high temperature increase Al/Si ratio only before 3 d, on the contrary to that from 3 to 28 d. However, the 20 ℃ curing stage from 28 to 180 d at variable temperature regime, is beneficial to the increase of AI/Si ratio which is still lower than that at constant temperature regime of 20 ℃ for the same age. A nonlinear relation exists between the Al/Si ratio and temperature variation or mean chain length （MCL） of C-S-H gels, furthermore, the amount ofAl3＋ which can occupy the bridging tetrahedra sites in C-S-H structure is insufficient in hardened Portland cement pastes. |
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| AbstractList | The effect of curing regime on degree of Al
3+
substituting for Si
4+
(Al/Si ratio) in C-S-H gels of hardened Portland cement pastes was investigated by
29
Si magic angel spinning (MAS) nuclear magnetic resonance (NMR) with deconvolution technique. The curing regimes included the constant temperature (20, 40, 60 and 80 °C) and variable temperature (simulated internal temperature of mass concrete with 60 °C peak). The results indicate that constant temperature of 20 °C is beneficial to substitution of Al
3+
for Si
4+
, and Al/Si ratio changes to be steady after 180 d. The increase of Al/Si ratio at 40 °C is less than that at 20 °C for 28 d. The other three regimes of high temperature increase Al/Si ratio only before 3 d, on the contrary to that from 3 to 28 d. However, the 20 °C curing stage from 28 to 180 d at variable temperature regime, is beneficial to the increase of Al/Si ratio which is still lower than that at constant temperature regime of 20 °C for the same age. A nonlinear relation exists between the Al/Si ratio and temperature variation or mean chain length (MCL) of C-S-H gels, furthermore, the amount of Al
3+
which can occupy the bridging tetrahedra sites in C-S-H structure is insufficient in hardened Portland cement pastes. The effect of curing regime on degree ofAl3＋ substituting for Si^4＋ （Al/Si ratio） in C-S-H gels of hardened Portland cement pastes was investigated by 29Si magic angel spinning （MAS） nuclear magnetic resonance （NMR） with deconvolution technique. The curing regimes included the constant temperature （20, 40, 60 and 80 ℃） and variable temperature （simulated internal temperature of mass concrete with 60 ℃ peak）. The results indicate that constant temperature of 20 ℃ is beneficial to substitution ofAl3＋ for Si4＋, and AI/Si ratio changes to be steady after 180 d. The increase of Al/Si ratio at 40 ℃is less than that at 20℃ for 28 d. The other three regimes of high temperature increase Al/Si ratio only before 3 d, on the contrary to that from 3 to 28 d. However, the 20 ℃ curing stage from 28 to 180 d at variable temperature regime, is beneficial to the increase of AI/Si ratio which is still lower than that at constant temperature regime of 20 ℃ for the same age. A nonlinear relation exists between the Al/Si ratio and temperature variation or mean chain length （MCL） of C-S-H gels, furthermore, the amount ofAl3＋ which can occupy the bridging tetrahedra sites in C-S-H structure is insufficient in hardened Portland cement pastes. |
| Author | HU Chenguang HU Shuguang DING Qingjun FENG Xiaoxin HUANG Xiulin |
| AuthorAffiliation | School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China College of Materials Science and Engineering, Hebei United University, Tangshan 063009, China School of Materials Science and Engineering, Hubei University, Wuhan 430062, China |
| Author_xml | – sequence: 1 givenname: Chenguang surname: Hu fullname: Hu, Chenguang organization: School of Materials Science and Engineering, Wuhan University of Technology – sequence: 2 givenname: Shuguang surname: Hu fullname: Hu, Shuguang email: hsg@whut.edu.cn organization: School of Materials Science and Engineering, Wuhan University of Technology – sequence: 3 givenname: Qingjun surname: Ding fullname: Ding, Qingjun organization: School of Materials Science and Engineering, Wuhan University of Technology – sequence: 4 givenname: Xiaoxin surname: Feng fullname: Feng, Xiaoxin organization: College of Materials Science and Engineering, Hebei United University – sequence: 5 givenname: Xiulin surname: Huang fullname: Huang, Xiulin organization: School of Materials Science and Engineering, Hubei University |
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| CitedBy_id | crossref_primary_10_1007_s11595_019_2098_7 crossref_primary_10_1016_j_conbuildmat_2019_07_229 crossref_primary_10_1007_s10973_020_09907_1 crossref_primary_10_1016_j_mtcomm_2022_104568 crossref_primary_10_1007_s11595_018_1946_1 crossref_primary_10_1007_s11595_015_1247_x |
| Cites_doi | 10.1021/jp990609q 10.1680/adcr.1990.3.11.105 10.1680/cc.25929 10.1016/S0008-8846(99)00168-4 10.1016/j.cemconres.2003.10.009 10.1111/j.1151-2916.1957.tb12579.x 10.1016/S0008-8846(96)00191-3 10.1021/ic020607b 10.1016/j.cemconres.2005.04.010 10.1016/j.cemconres.2004.05.034 10.1016/0025-5408(85)90156-4 10.1179/174367607X228098 10.1016/j.cemconres.2005.03.002 10.1180/minmag.1998.62A.1.232 10.1016/j.cemconres.2007.09.001 10.1016/j.conbuildmat.2007.04.014 10.1016/S0304-8853(97)00051-6 10.1016/j.cemconres.2007.06.002 10.1111/j.1151-2916.1993.tb07765.x 10.1039/ft9949002095 |
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| Keywords | substituting for Si C-S-H variable temperature constant temperature hardened cement pastes degree of Al |
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| Notes | The effect of curing regime on degree ofAl3＋ substituting for Si^4＋ （Al/Si ratio） in C-S-H gels of hardened Portland cement pastes was investigated by 29Si magic angel spinning （MAS） nuclear magnetic resonance （NMR） with deconvolution technique. The curing regimes included the constant temperature （20, 40, 60 and 80 ℃） and variable temperature （simulated internal temperature of mass concrete with 60 ℃ peak）. The results indicate that constant temperature of 20 ℃ is beneficial to substitution ofAl3＋ for Si4＋, and AI/Si ratio changes to be steady after 180 d. The increase of Al/Si ratio at 40 ℃is less than that at 20℃ for 28 d. The other three regimes of high temperature increase Al/Si ratio only before 3 d, on the contrary to that from 3 to 28 d. However, the 20 ℃ curing stage from 28 to 180 d at variable temperature regime, is beneficial to the increase of AI/Si ratio which is still lower than that at constant temperature regime of 20 ℃ for the same age. A nonlinear relation exists between the Al/Si ratio and temperature variation or mean chain length （MCL） of C-S-H gels, furthermore, the amount ofAl3＋ which can occupy the bridging tetrahedra sites in C-S-H structure is insufficient in hardened Portland cement pastes. 42-1680/TB constant temperature, variable temperature, degree of Al3＋ substituting for Si4＋, C-S-H, hardened cement pastes |
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| PublicationSubtitle | Materials Science Edition |
| PublicationTitle | Journal of Wuhan University of Technology. Materials science edition |
| PublicationTitleAbbrev | J. Wuhan Univ. Technol.-Mat. Sci. Edit |
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| PublicationYear | 2014 |
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| Title | Effect of Curing Regime on Degree of Al3＋ Substituting for Si4＋ in C-S-H Gels of Hardened Portland Cement Pastes |
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