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<p>This study investigated effect of high-range-water-reducing-admixture (HRWRA) on mechanical properties and micro-structure of brick- and stone-aggregate concretes having jute-fibers (JF). A total of eight concrete-mixes were prepared with 25-mm long jute fibers keeping JF content of 0–1.2%. Among eight mixes, HRWRA was added in four jute-fiber reinforced concrete (JFRC) mixes to investigate the effect of HRWRA. The experimental results demonstrated a substantial slump gain for both brick- and stone-aggregate JFRC with HRWRA. Compressive strength improvement was observed around 13–37% and 13–32% for brick- and stone-aggregate concrete having 0–1.2% JF content, respectively. Optimum JF content, considering compressive strength, was found 0.8%, and 0.4% for the cases of brick-chips and stone-chips, respectively. Meanwhile, super-plasticized JFRC made of stone-chips showed 15–34% increase in splitting tensile strength with the stipulated JF content of this study. The optimum JF content considering splitting tensile strength was found 0.8% for JFRC having brick- or stone-chips. Further, experimental observations demonstrated that HRWRA dosage had a detrimental effect on both modulus of rupture and ultimate impact toughness of JFRC with brick- or stone-chips. Furthermore, micro-structure of fractured surfaces of JFRC showed that HRWRA gave a uniform and denser micro-structure that resembled with the experimental compressive strength improvement up to optimum JF content. Finally, visual observation and micro-structure of JFRC demonstrated that pullout failure of JF did not occur. Initially, bridging effect of fiber was observed, and tension failure of individual fibers occurred ultimately in most of the test specimens.</p>

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Experimental investigation on the effect of high range water reducing admixture on mechanical and microstructural properties of jute fiber reinforced concrete

  • 期刊论文

  • 发表日期：

    2026年5月26日

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  • Faruk Patowary,
  • Tarikul Islam,
  • Debasish Sen,
  • Sharmin Reza Chowdhury

摘要

This study investigated effect of high-range-water-reducing-admixture (HRWRA) on mechanical properties and micro-structure of brick- and stone-aggregate concretes having jute-fibers (JF). A total of eight concrete-mixes were prepared with 25-mm long jute fibers keeping JF content of 0–1.2%. Among eight mixes, HRWRA was added in four jute-fiber reinforced concrete (JFRC) mixes to investigate the effect of HRWRA. The experimental results demonstrated a substantial slump gain for both brick- and stone-aggregate JFRC with HRWRA. Compressive strength improvement was observed around 13–37% and 13–32% for brick- and stone-aggregate concrete having 0–1.2% JF content, respectively. Optimum JF content, considering compressive strength, was found 0.8%, and 0.4% for the cases of brick-chips and stone-chips, respectively. Meanwhile, super-plasticized JFRC made of stone-chips showed 15–34% increase in splitting tensile strength with the stipulated JF content of this study. The optimum JF content considering splitting tensile strength was found 0.8% for JFRC having brick- or stone-chips. Further, experimental observations demonstrated that HRWRA dosage had a detrimental effect on both modulus of rupture and ultimate impact toughness of JFRC with brick- or stone-chips. Furthermore, micro-structure of fractured surfaces of JFRC showed that HRWRA gave a uniform and denser micro-structure that resembled with the experimental compressive strength improvement up to optimum JF content. Finally, visual observation and micro-structure of JFRC demonstrated that pullout failure of JF did not occur. Initially, bridging effect of fiber was observed, and tension failure of individual fibers occurred ultimately in most of the test specimens.