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Hai Yen Thi Nguyen,Withit Pansuk,Pakawat Sancharoen 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.8
The effects of electrochemical chloride extraction were evaluated using different electrolytes and binders on cylindrical concretespecimens with a water/binder ratio of 0.4. Two-percent NaCl by weight of binder was added to the water as a chloride source duringconcrete casting. After the specimens were immersed in water for three months, direct current 0.5 A/m2 was applied to releaseapproximately 30% initial chloride. The use of intermittent mode during extraction process was more efficient in releasing chloridethan a continuous mode. After treatment, although the average remaining-chloride content was higher than threshold value, itscontent at the interface was only approximately 0.4%. The accumulation of alkaline ions around the embedded steel was noticeablebut the distribution of calcium ions showed as different tendency. The migration of ions from the electrolyte was insignificant. Thisdemonstrated the important role of internal ions in transferring the charge during extraction; simultaneously, the decomposition ortransformation of hydrated products is inevitable. After the treatment was stopped for four weeks, the half-cell potential of the steelreached to low-corrosion state.
Effect of hybrid polypropylene-steel fibres on strength characteristics of UHPFRC
Nuaklong, Peem,Chittanurak, Jithaporn,Jongvivatsakul, Pitcha,Pansuk, Withit,Lenwari, Akhrawat,Likitlersuang, Suched Techno-Press 2020 Advances in concrete construction Vol.10 No.1
This study intends to produce an ultra-high performance fibre reinforced concrete (UHPFRC) made with hybrid fibres (i.e., steel and polypropylene). Compressive and tensile strength characteristics of the hybrid fibres UHPFRC are considered. A total of 14 fibre-reinforced composites (FRCs) with different fibre contents or types of fibres were prepared and tested in order to determine a suitable hybrid fibre combination. The compressive and tensile strengths of each concrete at 7 days were determined. The results showed that a hybrid mix of micro-polypropylene and steel fibres exhibited good compromising performances and is the ideal reinforcement mixture in a strong, cost-effective UHPFRC. In addition, maximum compressive strength of 167 MPa was achieved for UHPFRC using 1.5% steel fibres blended with 0.5% macro-polypropylene fibres.