Durability and microstructure of steam cured and autoclaved PHC pipe piles

Zhiyong Liu (Corresponding author), Lingkun Bu, Zixiao Wang, Guangqi Hu

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Effects of two different curing regimes (steam curing and autoclaved curing) on durability of pre-stressed high-strength concrete (PHC) pipe piles with fly ash (FA) had been investigated. The chloride penetration, salt and frost resistance performances of PHC pipe piles with these two curing regimes were tested. The results showed that the chloride ion permeability coefficient of steam cured sample at 85 °C for 4.5 h was decreased by 97.13% compared with that of autoclaved one, these steam cured sample could stand 150 times of salts (5% Na 2 SO 4 + 3.5% NaCl solution) corrosion tests and 550 times freeze-thaw tests. The pore structural and micro-cracking analysis of samples with three water to binder ratios (0.21, 0.23, 0.25) revealed that the mean total porosity values of these steam cured sample were about 5%, which was less than half of that of autoclaved samples. The dipping dyeing test showed that the mean micro-cracks width, length and the density of the steam cured samples were less than that of the autoclaved samples. The results supported that by optimizing the mix ratio and curing regime the PHC pipe piles could be prepared with satisfied mechanical and durability performances. So a feasible low-carbon manufacturing technology for PHC pipe piles was provided.

LanguageEnglish
Pages679-689
Number of pages11
JournalConstruction and Building Materials
Volume209
DOIs
StatePublished - 10 Jun 2019

Fingerprint

Concrete pipe
Steam
Piles
Curing
Durability
Microstructure
Chlorides
Salts
Frost resistance
Coal Ash
Hydraulic conductivity
Fly ash
Dyeing
Binders
Carbon
Porosity
Ions
Corrosion
Cracks
Water

Keywords

  • Autoclaved curing
  • Durability improvement mechanism
  • Microstructure
  • PHC pipe piles
  • Steam curing

Cite this

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abstract = "Effects of two different curing regimes (steam curing and autoclaved curing) on durability of pre-stressed high-strength concrete (PHC) pipe piles with fly ash (FA) had been investigated. The chloride penetration, salt and frost resistance performances of PHC pipe piles with these two curing regimes were tested. The results showed that the chloride ion permeability coefficient of steam cured sample at 85 °C for 4.5 h was decreased by 97.13{\%} compared with that of autoclaved one, these steam cured sample could stand 150 times of salts (5{\%} Na 2 SO 4 + 3.5{\%} NaCl solution) corrosion tests and 550 times freeze-thaw tests. The pore structural and micro-cracking analysis of samples with three water to binder ratios (0.21, 0.23, 0.25) revealed that the mean total porosity values of these steam cured sample were about 5{\%}, which was less than half of that of autoclaved samples. The dipping dyeing test showed that the mean micro-cracks width, length and the density of the steam cured samples were less than that of the autoclaved samples. The results supported that by optimizing the mix ratio and curing regime the PHC pipe piles could be prepared with satisfied mechanical and durability performances. So a feasible low-carbon manufacturing technology for PHC pipe piles was provided.",
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Durability and microstructure of steam cured and autoclaved PHC pipe piles. / Liu, Zhiyong (Corresponding author); Bu, Lingkun; Wang, Zixiao; Hu, Guangqi.

In: Construction and Building Materials, Vol. 209, 10.06.2019, p. 679-689.

Research output: Contribution to journalArticleAcademicpeer-review

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