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<p>This study investigates the use of magnesium phosphate cement (MPC), synthesised using waste refractory magnesia bricks (WRMB) and potassium dihydrogen phosphate (KDP), as a surface modifier to enhance recycled concrete aggregate (RA) performance. In India and China, WRMB recycling rates remain low at only 20%. The treatment involved blending of synthesised MPC powder and slurry with RA at a ratio of 1:8 by weight under both saturated and non-saturated conditions. The RA treated with slurry-saturated blend (MRA-IV) increased specific gravity by 17% and reduced water absorption, aggregate crushing value, and impact value by 34%, 14%, and 16%, respectively. MRA exhibited a 37% reduction in porosity and surface cracks. A concrete mix for M40 with 50% replacement of natural aggregate (NA) by RA and MRA was prepared. MRA-IV in concrete compressive strength improved by 58%, abrasion resistance by 19%, and tensile strength by 26%. A 50% replacement of NA significantly contributes to natural resource conservation while enabling waste reuse without compromising desirable properties. RA is a major component of construction and demolition (C&amp;D) waste, but its high porosity and surface cracks limit its application. This study demonstrates the potential of MPC treatment in enhancing RA for sustainable concrete applications.</p>

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Treatment of recycled concrete aggregate with magnesium phosphate cement

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月19日

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  • Yuvraj Rajesh Patil,
  • Vaidehi A. Dakwale,
  • Rahul V. Ralegaonkar

摘要

This study investigates the use of magnesium phosphate cement (MPC), synthesised using waste refractory magnesia bricks (WRMB) and potassium dihydrogen phosphate (KDP), as a surface modifier to enhance recycled concrete aggregate (RA) performance. In India and China, WRMB recycling rates remain low at only 20%. The treatment involved blending of synthesised MPC powder and slurry with RA at a ratio of 1:8 by weight under both saturated and non-saturated conditions. The RA treated with slurry-saturated blend (MRA-IV) increased specific gravity by 17% and reduced water absorption, aggregate crushing value, and impact value by 34%, 14%, and 16%, respectively. MRA exhibited a 37% reduction in porosity and surface cracks. A concrete mix for M40 with 50% replacement of natural aggregate (NA) by RA and MRA was prepared. MRA-IV in concrete compressive strength improved by 58%, abrasion resistance by 19%, and tensile strength by 26%. A 50% replacement of NA significantly contributes to natural resource conservation while enabling waste reuse without compromising desirable properties. RA is a major component of construction and demolition (C&D) waste, but its high porosity and surface cracks limit its application. This study demonstrates the potential of MPC treatment in enhancing RA for sustainable concrete applications.