Polyethylene Glycol-600/expanded clay aggregate with Alccofine1203 in concrete

Abstract

Abstract The present work focuses on improving the thermal and mechanical properties of concrete using polyethylene Glycol-600/Expanded Clay Aggregate (ECA) with Alccofine1203. Immersion method was adopted with two different standards; ECA immersed at room temperature and higher temperatures (30 °C, 40 °C & 50 °C) for 8 h. Now, these aggregates are taken out and again immersed in cement slurry for the next 2 h. Different tests were conducted on hardened (Compression, flexural, thermal & leakage properties) concrete. When liquid Polyethylene Glycol 600 (PEG600) was immersed in Expanded Clay Aggregate (ECA) at room temperature, percentage of immersed PCM was 12% and when same PEG600 was immersed in ECA at higher temperature (30 °C, 40 °C & 50 °C) percentage of PCM immersed was increased to 18% at 40 °C. Leakage of PCM-ECA was reduced by 60% for PCM-ECA material for 40 °C heating with an immersion time of 6 h. A total of 7 mixes were prepaid including reference mix with 91 specimens. Alccofine1203 was replaced with cement by 10% and 20% to improve mechanical properties. Compressive strength decreased as the percentage of PCM with ECA increased but gave satisfactory results for mix-3 (10% alccofine1203 + 10% ECA-PCM). Flexural strength showed that mix-3 and mix-6 gave equal strength to that of the reference mix. The thermal property of PCM was evaluated using DSC analysis and found that the latent heat was 108.9 J/g and 108.1 J/g at melting and freezing point. Thermal Conductivity decreased as the percentage of PCM with ECA increased. Mix-2 attained maximum reduction in thermal conductivity by 33.33% when compared with the reference mix. Leakage test was conducted on all the mixes and observed that the change in filter paperweight was 1.8%, 1.6% & 1.4% for mix-2, mix-5, and mix-6 respectively.