Effect of inorganic salts on pore structure of cement paste

Wen Cui Yang; Yong Ge; Jie Yuan; Bao Sheng Zhang

doi:10.4028/www.scientific.net/kem.405-406.378

Effect of inorganic salts on pore structure of cement paste

Wen Cui Yang^*
, Yong Ge
, Jie Yuan
, Bao Sheng Zhang

^*Corresponding author for this work

Harbin Institute of Technology

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

Inorganic salts are important admixtures usually used in cold weather concrete. As research basic of influence of salts on concrete durability, effects of inorganic salts on pore structure of cement paste were studied in this paper, and possible implications of concrete property with pore structure was also analyzed. Pore structure of paste added CaCl₂, NaCl, Na ₂SO₄, NaNO₂, Ca(NO₃)₂ and Ca(NO₂)₂ curing for 3 days and 28 days were tested through mercury intrusion porosimetry (MIP). The results showed that no matter 0.3 or 0.5 water-cement ratio, the pores whose diameter <50nm in paste with salts increased at 3 days, which was harmful for the control of concrete shrinkage and cracking at early age. Adding Ca (NO₃)₂ increased coarse pores (>200nm) of paste at 3 days, but these coarse pores turned into fine pores and reduced significantly at 28 days. Adding NaCl and Na₂SO₄ into cement paste raised coarse pores with size>1000nm at 3 days and 28days, which were harmful for the pore structure.

Original language	English
Pages (from-to)	378-383
Number of pages	6
Journal	Key Engineering Materials
Volume	405-406
DOIs	https://doi.org/10.4028/www.scientific.net/kem.405-406.378
State	Published - 2009
Externally published	Yes

Keywords

Cement paste
Inorganic salts
Mercury intrusion porosimetry
Pore structure

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10.4028/www.scientific.net/kem.405-406.378

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title = "Effect of inorganic salts on pore structure of cement paste",

abstract = "Inorganic salts are important admixtures usually used in cold weather concrete. As research basic of influence of salts on concrete durability, effects of inorganic salts on pore structure of cement paste were studied in this paper, and possible implications of concrete property with pore structure was also analyzed. Pore structure of paste added CaCl2, NaCl, Na 2SO4, NaNO2, Ca(NO3)2 and Ca(NO2)2 curing for 3 days and 28 days were tested through mercury intrusion porosimetry (MIP). The results showed that no matter 0.3 or 0.5 water-cement ratio, the pores whose diameter <50nm in paste with salts increased at 3 days, which was harmful for the control of concrete shrinkage and cracking at early age. Adding Ca (NO3)2 increased coarse pores (>200nm) of paste at 3 days, but these coarse pores turned into fine pores and reduced significantly at 28 days. Adding NaCl and Na2SO4 into cement paste raised coarse pores with size>1000nm at 3 days and 28days, which were harmful for the pore structure.",

keywords = "Cement paste, Inorganic salts, Mercury intrusion porosimetry, Pore structure",

author = "Yang, \{Wen Cui\} and Yong Ge and Jie Yuan and Zhang, \{Bao Sheng\}",

year = "2009",

doi = "10.4028/www.scientific.net/kem.405-406.378",

language = "英语",

volume = "405-406",

pages = "378--383",

journal = "Key Engineering Materials",

issn = "1013-9826",

publisher = "Trans Tech Publications Ltd",

}

TY - JOUR

T1 - Effect of inorganic salts on pore structure of cement paste

AU - Yang, Wen Cui

AU - Ge, Yong

AU - Yuan, Jie

AU - Zhang, Bao Sheng

PY - 2009

Y1 - 2009

N2 - Inorganic salts are important admixtures usually used in cold weather concrete. As research basic of influence of salts on concrete durability, effects of inorganic salts on pore structure of cement paste were studied in this paper, and possible implications of concrete property with pore structure was also analyzed. Pore structure of paste added CaCl2, NaCl, Na 2SO4, NaNO2, Ca(NO3)2 and Ca(NO2)2 curing for 3 days and 28 days were tested through mercury intrusion porosimetry (MIP). The results showed that no matter 0.3 or 0.5 water-cement ratio, the pores whose diameter <50nm in paste with salts increased at 3 days, which was harmful for the control of concrete shrinkage and cracking at early age. Adding Ca (NO3)2 increased coarse pores (>200nm) of paste at 3 days, but these coarse pores turned into fine pores and reduced significantly at 28 days. Adding NaCl and Na2SO4 into cement paste raised coarse pores with size>1000nm at 3 days and 28days, which were harmful for the pore structure.

AB - Inorganic salts are important admixtures usually used in cold weather concrete. As research basic of influence of salts on concrete durability, effects of inorganic salts on pore structure of cement paste were studied in this paper, and possible implications of concrete property with pore structure was also analyzed. Pore structure of paste added CaCl2, NaCl, Na 2SO4, NaNO2, Ca(NO3)2 and Ca(NO2)2 curing for 3 days and 28 days were tested through mercury intrusion porosimetry (MIP). The results showed that no matter 0.3 or 0.5 water-cement ratio, the pores whose diameter <50nm in paste with salts increased at 3 days, which was harmful for the control of concrete shrinkage and cracking at early age. Adding Ca (NO3)2 increased coarse pores (>200nm) of paste at 3 days, but these coarse pores turned into fine pores and reduced significantly at 28 days. Adding NaCl and Na2SO4 into cement paste raised coarse pores with size>1000nm at 3 days and 28days, which were harmful for the pore structure.

KW - Cement paste

KW - Inorganic salts

KW - Mercury intrusion porosimetry

KW - Pore structure

UR - https://www.scopus.com/pages/publications/58849145208

U2 - 10.4028/www.scientific.net/kem.405-406.378

DO - 10.4028/www.scientific.net/kem.405-406.378

M3 - 文章

AN - SCOPUS:58849145208

SN - 1013-9826

VL - 405-406

SP - 378

EP - 383

JO - Key Engineering Materials

JF - Key Engineering Materials

ER -

Effect of inorganic salts on pore structure of cement paste

Abstract

Keywords

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