ASSESSING THE PERFORMANCE OF HEMP CONCRETE IN WET-DRY CONDITIONS AND THERMAL PROTECTION EFFICIENCY

Thermal Protection and Wet-Dry Performance of Hemp Concrete

Abstract

This article presents the results of tests conducted on the properties of hemp concrete, evaluating its compressive strength, performance under wet-dry conditions, and effectiveness in preventing external heat transfer. The research began with the production of hemp concrete improved with Al₂(SO₄)₃ and polymers. The property tests were conducted following TIS 109-2517 standards and compared with TIS 58-2560 standards, including an assessment of performance after undergoing 18 cycles of wet-dry conditions. The comparison of heat protection was made between hemp concrete and lightweight concrete by calculating the OTTV and measuring heat flux using a box-shaped building model. The test results of hemp concrete cured for 28 days indicated an initial compressive strength of 4.31 MPa, a dry density of 1,008 kg/m³, and a water absorption value of 329 kg/m³. After 18 cycles of wetting and drying, the compressive strength slightly decreased to 4.27 MPa, the dry density reduced to 934 kg/m³, and water absorption increased to 463 kg/m³. Importantly, the compressive strength after 18 cycles remained within the acceptable range according to TIS 58-2560 standards. In evaluating the effectiveness of external heat protection, the hemp concrete sample showed a thermal conductivity of 0.14 w/m°C and a specific heat capacity of 1.02 kJ/kg°C. The maximum OTTV was 30.07 w/m² when the wall faced southeast. The heat transfer test results through the walls of the box-shaped building model aligned with the OTTV findings, suggesting that hemp concrete transfers less heat than lightweight concrete.The findings suggested that hemp concrete, enhanced with Al₂(SO₄)₃ and polymers, met TIS 58-2560 standards for strength and durability while providing better thermal protection compared to lightweight concrete, making it an effective energy-saving building material.