Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Durability and microstructure of steam cured and autoclaved PHC pipe piles
https://orcid.org/0000-0001-8240-4014
Highlights A feasible steam curing regime and mix proportion of PHC pipe piles was proposed. Durability and micro-structural performances of steam cured and autoclaved PHC pipe piles were discussed. The PHC pipe piles cured by steam curing regimes showed better salt and frost resistance performance.
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% Na2SO4 + 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.
Durability and microstructure of steam cured and autoclaved PHC pipe piles
https://orcid.org/0000-0001-8240-4014
Highlights A feasible steam curing regime and mix proportion of PHC pipe piles was proposed. Durability and micro-structural performances of steam cured and autoclaved PHC pipe piles were discussed. The PHC pipe piles cured by steam curing regimes showed better salt and frost resistance performance.
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% Na2SO4 + 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.
Durability and microstructure of steam cured and autoclaved PHC pipe piles
https://orcid.org/0000-0001-8240-4014
Highlights A feasible steam curing regime and mix proportion of PHC pipe piles was proposed. Durability and micro-structural performances of steam cured and autoclaved PHC pipe piles were discussed. The PHC pipe piles cured by steam curing regimes showed better salt and frost resistance performance.
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% Na2SO4 + 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.
Durability and microstructure of steam cured and autoclaved PHC pipe piles
Liu, Zhiyong (Autor:in) / Bu, Lingkun (Autor:in) / Wang, Zixiao (Autor:in) / Hu, Guangqi (Autor:in)
Construction and Building Materials ; 209 ; 679-689
13.03.2019
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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