Experimental Investigation of Shear- Critical Reactive Powder Concrete Beams without Web Reinforcement

Abstract

An experimental investigation was conducted on the behavior of ultra-high strength reactive powder concrete (RPC) beams. Fifteen singly reinforced beams were cast without web reinforcement. The main variables were the steel fiber content, longitudinal steel ratio, shear span to effective depth (a/d) ratio and silica fume content. The maximum concrete matrix compressive strength f' cf was 110 MPa, containing one type of fiber. An empirical expression is proposed to predict the shear stress resistance of RPC beams without web reinforcement. The proposed expressions gave good prediction for shear strength. ‫اﻟﻔﻌﺎﻟﺔ‬ ‫اﻟﻣﺳﺎﺣﯾق‬ ‫ﺧرﺳﺎﻧﺔ‬ ‫ﻟﻌﺗﺑﺎت‬ ‫اﻟﻌﻣﻠﻲ‬ ‫اﻻﺳﺗﻘﺻﺎء‬ ‫اﻟﻘص‬ ‫ﺗﺳﻠﯾﺢ‬ ‫ﻣن‬ ‫اﻟﺧﺎﻟﯾﺔ‬ ‫اﻟﺧﻼﺻﺔ‬ ‫ﺟ‬ ‫ﻋﻣﻠﻲ‬ ‫اﺳﺗﻘﺻﺎء‬ ‫ﻋﻣﻠﯾﺔ‬ ‫رت‬ ‫ﻣن‬ ‫ﻣﺻﻧوﻋﺔ‬ ‫اﻟﻣﻘﺎوﻣﺔ‬ ‫ﻋﺎﻟﯾﺔ‬ ‫ﺧرﺳﺎﻧﯾﺔ‬ ‫ﻋﺗﺑﺎت‬ ‫ﺳﻠوك‬ ‫ﻋﻠﻰ‬ ‫اﻟﻔﻌﺎﻟﺔ‬ ‫اﻟﻣﺳﺎﺣﯾق‬. ‫اﻟﻘص‬ ‫ﺗﺳﻠﯾﺢ‬ ‫ﻣن‬ ‫وﺧﺎﻟﯾﺔ‬ ‫ﺻﺑﮭﺎ‬ ‫ﺗم‬ ‫طوﻟﻲ‬ ‫ﺗﺳﻠﯾﺢ‬ ‫ﺣدﯾد‬ ‫ﺗﺣوي‬ ‫ﻋﺗﺑﺔ‬ ‫ﻋﺷرة‬ ‫ﺧﻣﺳﺔ‬. ‫اﻟﻔوﻻذﯾﺔ‬ ‫اﻻﻟﯾﺎف‬ ‫ﻣﺣﺗوى‬ ‫ھﻲ‬ ‫دراﺳﺗﮭﺎ‬ ‫ﺗم‬ ‫اﻟﺗﻲ‬ ‫اﻟرﺋﯾﺳﯾﺔ‬ ‫اﻟﻣﺗﻐﯾرات‬ , ‫اﻟطوﻟﻲ‬ ‫اﻟﺗﺳﻠﯾﺢ‬ ‫ﺣدﯾد‬ ‫ﻧﺳﺑﺔ‬ , ‫اﻟﻘ‬ ‫ﻓﺿﺎء‬ ‫ﻧﺳﺑﺔ‬ ‫اﻟﻔﻌﺎﻟﺔ‬ ‫اﻟﺳﻠﯾﻛﺎ‬ ‫وﻣﺣﺗوى‬ ‫اﻟﻔﻌﺎل‬ ‫اﻟﻌﻣق‬ ‫اﻟﻰ‬ ‫ص‬. ‫اﻋ‬ ‫ﻛﺎﻧت‬ ‫اﻻﻧﺿﻐﺎط‬ ‫ﻟﻣﻘﺎوﻣﺔ‬ ‫ﻗﯾﻣﮫ‬ ‫ﻠﻰ‬ 110 ‫اﻟﻔوﻻذﯾﺔ‬ ‫اﻻﻟﯾﺎف‬ ‫ﻣن‬ ‫واﺣد‬ ‫ﻧوع‬ ‫ﺑﺎﺳﺗﻌﻣﺎل‬ ‫ﻣﯾﻛﺎﺑﺎﺳﻛﺎل‬. ‫ﻋﻼﻗ‬ ‫اﻗﺗراح‬ ‫ﺗم‬ ‫ﺎت‬ ‫اﺟﮭﺎد‬ ‫ﺑﻣﻘﺎوﻣﺔ‬ ‫ﻟﻠﺗﻧﺑؤ‬ ‫اﻟﻘص‬ ‫ﺗﺳﻠﯾﺢ‬ ‫ﻣن‬ ‫اﻟﺧﺎﻟﯾﺔ‬ ‫اﻟﻔﻌﺎﻟﺔ‬ ‫اﻟﻣﺳﺎﺣﯾق‬ ‫ﺧرﺳﺎﻧﺔ‬ ‫ﻟﻌﺗﺑﺎت‬ ‫اﻟﻘص‬. ‫اﻟﻌﻼﻗ‬ ‫ﺎت‬ ‫اظﮭرت‬ ‫ااﻟﻣﻘﺗرﺣﺔ‬ ‫ﺗطﺎﺑ‬ ‫اﻟﻌﻣﻠﯾ‬ ‫اﻟﻧﺗﺎﺋﺞ‬ ‫ﻣﻊ‬ ‫ﺑﺎﻟﻣﻘﺎرﻧﺔ‬ ‫اﻟﻘص‬ ‫اﺟﮭﺎد‬ ‫ﻟﻣﻘﺎوﻣﺔ‬ ً‫ًﺟﯾدا‬ ‫ﻘﺎ‬ ‫ﺔ‬ .