A novel method for semi-quantitative analysis of hydration degree of cement by 1H low-field NMR

被引：168

作者：

Liu, Heng ^{[1
,2
]}

Sun, Zhenping ^{[1
]}

Yang, Jingbin ^{[1
,2
]}

Ji, Yanliang ^{[1
]}

机构：

[1] Tongji Univ, Key Lab Adv Civil Engn Mat, Minist Educ, Shanghai 201804, Peoples R China

[2] Tongji Univ, Sch Mat Sci & Engn, Shanghai 201804, Peoples R China

来源：

CEMENT AND CONCRETE RESEARCH | 2021年 / 141卷

基金：

中国国家自然科学基金;

关键词：

H-1 low-field NMR; Hydration degree; Cement paste; Transverse relaxation time; PASTE; RELAXOMETRY; SHRINKAGE; CONCRETE; WATER; MODEL;

D O I：

10.1016/j.cemconres.2020.106329

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Based on the analytical H-1 low-field nuclear magnetic resonance (NMR) technique, we developed a novel method and corresponding model to analyze the hydration degree (alpha(t)) of cement in cement paste under different curing conditions. The hydration degree can be calculated quantitatively based on the transverse relaxation time (T-2) distributions using NMR measurements. The T-2 distributions of the cement paste samples with the water/cement (W/C) ratios of 0.25, 0.35 and 0.45 under standard curing, steam curing at 40 degrees C and steam curing at 60 degrees C were obtained. The alpha(t) of cement was studied by the hydration heat method and portlandite (CH) quantitative measurements. The results show that the intensity-weighted T-2 value of non-surface water peaks ((T) over bar (2)) has a significant correlation with alpha(t) that can be expressed by an exponential equation. In this paper, the derivation of this exponential equation is given, and the effects of W/C ratio and curing condition on its parameters are analyzed.

引用

页数：11

共 39 条

[1]

[Anonymous], 2008, 12959 GBT

[2]

[Anonymous], 2005, 2015 GBT

[3] The work of powers and brownyard revisited: Part I [J].

Brouwers, HJH .

CEMENT AND CONCRETE RESEARCH, 2004, 34 (09) :1697-1716

[4] IMPORTANCE OF CLASSICAL DIFFUSION IN NMR-STUDIES OF WATER IN BIOLOGICAL CELLS [J].

BROWNSTEIN, KR ;

TARR, CE .

PHYSICAL REVIEW A, 1979, 19 (06) :2446-2453

[5] Prediction of self-desiccation in low water-to-cement ratio pastes based on pore structure evolution [J].

Chen, Hui ;

Wyrzykowski, Mateusz ;

Scrivener, Karen ;

Lura, Pietro .

CEMENT AND CONCRETE RESEARCH, 2013, 49 :38-47

[6] A new approach in mathematical modelling of cement hydration development [J].

Dabic, P ;

Krstulovic, R ;

Rusic, D .

CEMENT AND CONCRETE RESEARCH, 2000, 30 (07) :1017-1021

[7] Fundamental study of early age concrete behaviour as a basis for durable concrete structures [J].

De Schutter, G .

MATERIALS AND STRUCTURES, 2002, 35 (245) :15-21

[8] Drying effect on cement paste porosity at early age observed by NMR methods [J].

Faure, Pamela F. ;

Care, Sabine ;

Magat, Julie ;

Chaussadent, Thierry .

CONSTRUCTION AND BUILDING MATERIALS, 2012, 29 :496-503

[9] NMR relaxometry during internal curing of Portland cements by lightweight aggregates [J].

Friedemann, Karen ;

Schoenfelder, Wiete ;

Stallmach, Frank ;

Kaerger, Joerg .

MATERIALS AND STRUCTURES, 2008, 41 (10) :1647-1655

[10]

Greener J, 2000, J AM CERAM SOC, V83, P623

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