Assessment of Shrinkage Strain Reduction SSR for RC Slabs with Different Thicknesses Strengthen with Different Layers of Geogrid

Document Type : Original Article

Authors

1 Department of Civil Engineering, Zagazig Higher Institute of Engineering & Technology, Zagazig, Egypt

2 Department of Civil Engineering, Zagazig Higher Institute of Engineering & Technology, Zagazig, Egypt

3 Faculty of Engineering, Zagazig University, Egypt

4 Faculty of Engineering, Zagazig University, Zagazig, Egypt

Abstract

This study presents experimental work to evaluate the efficiency of using the biaxial geogrid as a shrinkage reinforcement for RC slabs instead of using upper shrinkage steel reinforcement. Geogrid distinguish from steel reinforcement in its low cost and it doesn’t rust. The present work studies and assesses the shrinkage strain of RC slabs considering different parameters, slab thickness, number of geogrid layers, and thickness of the upper concrete cover. The shrinkage strain is measured, while shrinkage strain reduction SSR% is determined considering plastic and dry shrinkages, along with temperature and humidity are recorded weekly for 15 specimens of 50*50 cm slabs over 91 days. All specimens have lower steel reinforcement with/without upper geogrid reinforcement. The results prove the efficiency of geogrids reinforcement to resist the shrinkage stains in RC slabs, where, two layers of geogrids with 3 cm of upper cover gives the lowest shrinkage stain, i.e., largest shrinkage resistance. The results also show that as the RC slab thickness decrease as the shrinkage strain and SSR% value increase and vice versa. But there is no noteworthy effect of geogrid on the SSR% value.

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The Egyptian International Journal of Engineering Sciences and Technology
Volume 41, Issue 1
Civil and Architectural Engineering
March 2023
Pages 48-55

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