Feasibility test and evaluation models to develop sustainable insulation concrete using foam and bottom ash aggregates

• Published in: Construction & building materials Vol. 225; pp. 620 - 632
• Main Authors: Yang, Keun-Hyeok, Hwang, Yong-Ha, Lee, Yongjei, Mun, Ju-Hyun
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 20.11.2019
• Subjects: Bottom ash lightweight aggregate; Foam; Mechanical property; Thermal conductivity; Unit binder; Thermal conductivity; Unit binder; Foam; Bottom ash lightweight aggregate; Mechanical property
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2019.07.130

•The objective of this study is to evaluate the consistency of the mixture and mechanical properties of bottom ash aggregate-based lightweight concrete (BS-LWA) with foam volume ratio of less than 25% to develop sustainable insulation concrete using foam and bottom ash aggregate.•The test results on the mechanical properties and thermal conductivity for concrete with BS-LWA and a foam volume ratio of less than 25% and comparisons with the values calculated from the ACI code provide fundamental available data for studies on the combination of lightweight concrete with the addition of foam.•In addition, simple empirical equations for the mechanical properties and thermal conductivity of LWBSC with low foam volume ratio were proposed, based on the test results obtained in this study.•Consequently, the proposed models can be used as practical equations for the design of sustainable PC panels using LWBSC with low foam volume contents. The present study aims to examine the limitation and significance to develop sustainable lightweight concrete using bottom ash aggregates and preformed foam (LWC-BF). As a positive action for sustainability, ordinary Portland cement (OPC) was replaced by using 50% ground-granulated blast-furnace slag (GGBS) and 20% fly ash (FA), and bottom ash particles were used for entire replacement of natural fine and coarse aggregates. To improve the thermal resistance of concrete, preformed foam was added at the maximum volume fraction of 25%. The test parameters investigated included unit binder content, foam volume fraction, and curing temperature. The different mechanical properties and thermal conductivity for LWC-BF were formulated from the regression analysis using test data. Additionally, the measured compressive strength, thermal conductivity, and air-dried density of LWC-BF were compared with the requirements for precast concrete (PC) insulation panel. Thus, a reliable mixture proportioning for the application to the PC insulation panel could be recommended with the use of unit binder content of 500 kg/m3 and foam volume fraction ranging from 10% to 25%.