Effects of W/B ratios and fly ash finenesses on chloride diffusion coefficient of concrete in marine environment

บทความในวารสาร

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

ไม่พบข้อมูลที่เกี่ยวข้อง

รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Chalee W., Jaturapitakkul C.

ผู้เผยแพร่: Springer

ปีที่เผยแพร่ (ค.ศ.): 2009

วารสาร: Materials and Structures (1359-5997)

Volume number: 42

Issue number: 4

หน้าแรก: 505

หน้าสุดท้าย: 514

จำนวนหน้า: 10

นอก: 1359-5997

eISSN: 1871-6873

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-65049092244&doi=10.1617%2fs11527-008-9398-2&partnerID=40&md5=4ab9549cdcfacbefab7605bdbcbac483

ภาษา: English-Great Britain (EN-GB)

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บทคัดย่อ

The objectives of this investigation were to study the effect of W/B ratios and fly ash finenesses on chloride diffusion coefficient (Dc) of concrete under marine environment. Original and classified fly ashes were used as a partial replacement of Portland cement type I at 0%, 15%, 25%, 35%, and 50% by weight of binder. Water to binder ratios (W/B) were varied as 0.45, 0.55, and 0.65. Concrete cube specimens of 200 mm were cast and removed from the molds after casting 1 day and then cured in fresh water for 27 days. After that, the specimens were placed to the tidal zone of marine environment in the Gulf of Thailand. Subsequently, the specimens were tested for chloride penetration profile after being exposed to the tidal zone for 2, 3, 4, and 5 years. The regression analysis of investigated data was carried out and Fick's second law of diffusion was applied to calculate the chloride diffusion coefficient (D c) and chloride concentration at concrete surface (Co) based on one-dimensional analysis. The results showed that Dc of all concrete mixtures decreased with an exposure time and the decrease of W/B ratio resulted in the decrease of Dc. When the W/B ratio of concrete was reduced, the decrease of Dc in cement concrete was higher than that of the fly ash concrete. The use of fly ash with high fineness clearly reduced the rate of chloride ingress into concrete. In addition, fly ash with high fineness has more effective on reducing of Dc in concrete with higher W/B ratio than that with lower W/B ratio. ฉ 2008 RILEM.

คำสำคัญ

Finenesses, W/B ratio