Modeling the factors affecting compressive strength and dry density of block (AAC) using RSM method

Articles in Press

Document Type : Mining Engineering Article

Authors

1 Department of Mining Eng., Sahand University of Technology, Tabriz,, Iran

2 Department of Mining Engineering, Sahand University of Technology,,Tabriz, Iran.

3 Department of Materials Engineering, University of Applied Sciences, Marand, Iran

Abstract

This study investigates the factors influencing the compressive strength and dry density of autoclaved aerated concrete (AAC) blocks using the Response Surface Methodology (RSM). Silica purity, water content, and particle size were considered as the primary parameters in the experimental design. The results indicated that higher silica purity increases the compressive strength and product density by 26.76% and 4.1%, respectively. Conversely, increasing water content resulted in a 16.31% reduction in compressive strength, with negligible effects on density changes. Particle size showed no significant impact on compressive strength within the studied range; however, larger particles increased density due to reduced porosity. RSM optimization revealed that the optimal combination—high-purity silica, medium water content (636d cc), and small particle size (d80 = 55 µm)—achieved the highest compressive strength (236.37 kg/cm²) and the lowest density (535.63 g/cm³). This research highlights the critical role of raw material quality, particularly silica purity, and precise mix control in enhancing the mechanical and physical properties of AAC blocks. The findings provide practical solutions for producing higher-performing AAC products, contributing to cost reduction and improved efficiency in lightweight construction materials.

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Journal of Modeling in Engineering

Articles in Press, Accepted Manuscript
Available Online from 22 January 2025

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History

  • Receive Date: 17 May 2024
  • Revise Date: 01 January 2025
  • Accept Date: 06 January 2025

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