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<p>Cementitious grouts modified with polymers demonstrate significant performance and improvements however, individual additives tend to enhance specific properties while compromising others. Styrene butadiene rubber (SBR), improves both flowability and compressive strength at moderate dosages, but excessive use induces air entrainment, leading to strength reduction. On the other hand, polyvinyl alcohol (PVA) contributes to improved tensile behavior and crack resistance but increases viscosity, which negatively affects workability. This study investigates the combined influence of SBR (3%, 6%, 9%) and PVA (1%, 1.5%, 2%) across a range of w/c ratios (0.35–0.50) to develop an optimized grout mixture that balances fresh and hardened properties. The grout mixes were evaluated for flow time, viscosity, compressive strength, and split tensile strength. Results indicate that moderate polymer dosages improve both fluidity and mechanical performance, whereas excessive polymer content or high w/c ratios cause phase instability and reduce overall strength. The optimal formulation for high compressive strength was achieved at a w/c ratio of 0.40, with 3.68% SBR and 1.13% PVA, demonstrating a 16.7% increase in compressive strength and a 12.4% improvement in flowability compared to the control mix. For applications requiring higher workability without significantly compromising strength, the optimal mix shifted slightly, favoring a w/c ratio between 0.48 and 0.50, SBR content of 3.0–3.3%, and PVA content of 1.0–1.3%. Fourier-transform infrared spectroscopy (FTIR) analysis confirmed chemical interaction between polymers and cement hydration products through intensified O–H and C–O stretching. The study also revealed strong correlations between strength and flow properties, highlighting their interdependence in grout performance. Future research should focus on evaluating fatigue resistance and long-term durability under cyclic loading and aggressive environmental conditions to ensure the suitability of these formulations in real-world applications.</p>

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Experimental Investigation and Statistical Optimization of Polymer-Modified Cementitious Grout Using Response Surface Methodology

  • 期刊论文

  • 发表日期：

    2025年7月29日

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  • Kamran Rashid,
  • Shashi Kant Sharma,
  • Mohammad Shahid Raza

摘要

Cementitious grouts modified with polymers demonstrate significant performance and improvements however, individual additives tend to enhance specific properties while compromising others. Styrene butadiene rubber (SBR), improves both flowability and compressive strength at moderate dosages, but excessive use induces air entrainment, leading to strength reduction. On the other hand, polyvinyl alcohol (PVA) contributes to improved tensile behavior and crack resistance but increases viscosity, which negatively affects workability. This study investigates the combined influence of SBR (3%, 6%, 9%) and PVA (1%, 1.5%, 2%) across a range of w/c ratios (0.35–0.50) to develop an optimized grout mixture that balances fresh and hardened properties. The grout mixes were evaluated for flow time, viscosity, compressive strength, and split tensile strength. Results indicate that moderate polymer dosages improve both fluidity and mechanical performance, whereas excessive polymer content or high w/c ratios cause phase instability and reduce overall strength. The optimal formulation for high compressive strength was achieved at a w/c ratio of 0.40, with 3.68% SBR and 1.13% PVA, demonstrating a 16.7% increase in compressive strength and a 12.4% improvement in flowability compared to the control mix. For applications requiring higher workability without significantly compromising strength, the optimal mix shifted slightly, favoring a w/c ratio between 0.48 and 0.50, SBR content of 3.0–3.3%, and PVA content of 1.0–1.3%. Fourier-transform infrared spectroscopy (FTIR) analysis confirmed chemical interaction between polymers and cement hydration products through intensified O–H and C–O stretching. The study also revealed strong correlations between strength and flow properties, highlighting their interdependence in grout performance. Future research should focus on evaluating fatigue resistance and long-term durability under cyclic loading and aggressive environmental conditions to ensure the suitability of these formulations in real-world applications.