Abstract




 
   

IJE TRANSACTIONS B: Applications Vol. 30, No. 11 (November 2017) 1681-1690   

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  COMPARISON OF PERMEABILITY AND DRYING SHRINKAGE OF SELF COMPACTING CONCRETE ADMIXED WITH WOLLASTONITE MICRO FIBER AND FLYASH
 
S. Kant Sharma, G. D. Ransinchung R. N., P. Kumar and A. Kumar Roy
 
( Received: June 22, 2017 – Accepted in Revised Form: September 08, 2017 )
 
 

Abstract    Cement substitution in self compacting concrete (SCC) is emphasized to conserve environment, reduce cost and utilize waste materials. This paper focuses on comparing the permeability and drying shrinkage of SCC containing Wollastonite micro fiber (WMF), a cheap pozzolanic fiber with respect to flyash. Microsilica was added for providing required viscosity to maintain homogeneity of the mixes. Trials to check flowability, passability and segregation resistance were conducted on binary, ternary and combined mixes of binder material. Results showed that drying shrinkage reduced by 49% for WMF reinforced concrete, whereas it increased by 1.25% for flyash ones as compared to normal concrete. Permeability coefficient decreased by 82% and 74%, respectively. Capillary voids influenced the permeability of hardened concrete, but drying shrinkage was largely influenced by the rate of gain of tensile strength and expanding ettringite. Notably, flyash is not a reliable admixture for controlling drying shrinkage of high flow concretes.

 

Keywords    permeability, self compacting concrete, drying shrinkage, flyash, micro fiber

 

چکیده    انتخاب جایگزینی برای سیمان در بتن خود تراکم (SCC) برای حفظ محیط زیست، کاهش هزینه و استفاده از مواد زائد حائز اهمیت است. این مقاله بر روی مقایسه نفوذ پذیری و آب­رفتگی SCC که حاوی میکرو فیبر Wollastonite (WMF)، که فیبری پوزولانی ارزان در مقایسه با خاکستر بادی است، تمرکز دارد. میکروسیلیکا نیز به منظور ایجاد گران­روی مورد نیاز برای حفظ همگنی مخلوط اضافه شد. آزمایش­های لازم برای بررسی جریان­پذیری، عبورپذیری (روانی ) و مقاومت در مقابل جدانشینی در مخلوط­های دوتایی، سه­تایی و ترکیبی از مواد هم­گیر انجام شد. نتایج نشان داد که آب­رفتگی بتن مسلح حاوی WMF به میزان 49% کاهش یافته، در حالی که برای بتن معمولی حاوی خاکستر بادی 1.25٪ افزایش یافته است. ضریب نفوذ پذیری برای این دو حالت به ترتیب 82٪ و 74٪ کاهش یافته است. حفره­های مویینگی بر نفوذ پذیری بتن سخت­شده تاثیر گذاشت، اما آب­رفتگی به طور عمده تحت تأثیر افزایش مقاومت کششی قرار گرفت. به طور مشخص، خاکستر بادی یک افزودنی قابل اعتمادی برای کنترل آب­رفتگی بتن­های روان نیست.

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