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CLC number: TU528.1

On-line Access: 2013-10-07

Received: 2013-03-26

Revision Accepted: 2013-08-02

Crosschecked: 2013-09-12

Cited: 4

Clicked: 6971

Citations:  Bibtex RefMan EndNote GB/T7714

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Journal of Zhejiang University SCIENCE A 2013 Vol.14 No.10 P.720-730

http://doi.org/10.1631/jzus.A1300101


Experimental investigation of the factors affecting accuracy and resolution of the pore structure of cement-based materials by thermoporometry*


Author(s):  Zheng-wu Jiang1, Wen-ting Li1, Zi-long Deng1, Zhi-guo Yan2

Affiliation(s):  1. Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai 200092, China; more

Corresponding email(s):   lwt@tongji.edu.cn

Key Words:  Thermoporometry (TPM), Pore structure, Cement-based, Accuracy, Resolution


Zheng-wu Jiang, Wen-ting Li, Zi-long Deng, Zhi-guo Yan. Experimental investigation of the factors affecting accuracy and resolution of the pore structure of cement-based materials by thermoporometry[J]. Journal of Zhejiang University Science A, 2013, 14(10): 720-730.

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author="Zheng-wu Jiang, Wen-ting Li, Zi-long Deng, Zhi-guo Yan",
journal="Journal of Zhejiang University Science A",
volume="14",
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doi="10.1631/jzus.A1300101"
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%T Experimental investigation of the factors affecting accuracy and resolution of the pore structure of cement-based materials by thermoporometry
%A Zheng-wu Jiang
%A Wen-ting Li
%A Zi-long Deng
%A Zhi-guo Yan
%J Journal of Zhejiang University SCIENCE A
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%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1300101

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T1 - Experimental investigation of the factors affecting accuracy and resolution of the pore structure of cement-based materials by thermoporometry
A1 - Zheng-wu Jiang
A1 - Wen-ting Li
A1 - Zi-long Deng
A1 - Zhi-guo Yan
J0 - Journal of Zhejiang University Science A
VL - 14
IS - 10
SP - 720
EP - 730
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A1300101


Abstract: 
thermoporometry (TPM) is a calorimetric-based technique for characterizing pore structure according to the freezing and melting point depression of liquid confined in pores which attributes to a varying phase-transition free energy by interface curvature. TPM has demonstrated an emerging success in applications for determining the mesopores of cement-based materials in recent decades. To improve its resolution and accuracy, this paper discussed these factors which show a great influence on the baseline heat flow and the derived pore structure using two molecular sieves with discontinuous size for calibration, referring to the sample handling, the mass of sample and the varying temperature. The pore size distributions of ordinary and high-strength concrete by TPM were favorably compared to the results taken by nitrogen adsorption/desorption (NAD) and mercury intrusion porosimetry (MIP). The results illustrated that both the accuracy and resolution improve with the decreasing cooling/heating rate until 1 °C/min; however, if the rate is too slow, it can lead to an unstable result. The mass of the sample tested has much less an effect on the accuracy when it increases to more than 30 mg. TPM is demonstrated to be more accurate to characterize the mesopores with the size bigger than 4 nm as compared to NAD and MIP.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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