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Improving the thermo-physical properties of plastering mortar is a pivotal trend for reducing energy consumption in buildings. The aim of this study is to develop an eco-friendly lightweight (LW) thermally resistive one-coat rendering mortar. Limestone-calcined clay cement (LC3) green binder was prepared by replacing over 50 wt% of the white Portland cement (WPC) with supplementary materials, including limestone and calcined clay. The binder has been mixed with exfoliated vermiculite (EVM) aggregate with different aggregate volume contents ranging from 25 to 75%. The results revealed that the newly developed mortars fulfil the standard technical requirements for thermally insulating renders. The mortar incorporating 75 vol.% EVM possesses the lowest TC (0.19 W/m.K.) and the lowest compressive strength (10.23 MPa); furthermore, it reduces thermal loads or heat flow into buildings by 30%. The scanning electron microscopy (SEM) showed reasonable bonding and a dense interfacial transition zone between the EVM and the LC3 cementitious matrix. The investigation of the fire resistance rating of the newly developed mortar is recommended for future work.

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Innovative Design of Thermal Insulating Green Rendering Mortar for Energy Efficient Buildings

  • 会议论文

  • 发表日期：

    2025年

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  • Hamada Shoukry

摘要

Improving the thermo-physical properties of plastering mortar is a pivotal trend for reducing energy consumption in buildings. The aim of this study is to develop an eco-friendly lightweight (LW) thermally resistive one-coat rendering mortar. Limestone-calcined clay cement (LC3) green binder was prepared by replacing over 50 wt% of the white Portland cement (WPC) with supplementary materials, including limestone and calcined clay. The binder has been mixed with exfoliated vermiculite (EVM) aggregate with different aggregate volume contents ranging from 25 to 75%. The results revealed that the newly developed mortars fulfil the standard technical requirements for thermally insulating renders. The mortar incorporating 75 vol.% EVM possesses the lowest TC (0.19 W/m.K.) and the lowest compressive strength (10.23 MPa); furthermore, it reduces thermal loads or heat flow into buildings by 30%. The scanning electron microscopy (SEM) showed reasonable bonding and a dense interfacial transition zone between the EVM and the LC3 cementitious matrix. The investigation of the fire resistance rating of the newly developed mortar is recommended for future work.