Computers and Concrete

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Assessment of compressive strength of cement mortar with glass powder from the early strength

  • Wang, Chien-Chih (Department of Civil Engineering and Geomatics, Cheng Shiu University) ;
  • Ho, Chun-Ling (College of Civil Engineering, Huaqiao University, Intelligence and Automation in Construction Fujian Province Higher-educational Engineering Research Centre) ;
  • Wang, Her-Yung (Department of Civil Engineering, National Kaohsiung University of Science and Technology) ;
  • Tang, Chi (Department of Soil and Water Conservation, National Pingtung University of Science and Technology)
  • Received : 2018.03.03
  • Accepted : 2019.06.17
  • Published : 2019.08.25
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Abstract

The sustainable development principle of replacing natural resources with renewable material is an important research topic. In this study, waste LCD (liquid crystal display) glass powder was used to replace cement (0%, 10%, 20% and 30%) through a volumetric method using three water-binder ratios (0.47, 0.59, and 0.71) to make cement mortar. The compressive strength was tested at the ages of 7, 28, 56 and 91 days. The test results show that the compressive strength increases with age but decreases as the water-binder ratio increases. The compressive strength slightly decreases with an increase in the replacement of LCD glass powder at a curing age of 7 days. However, at a curing age of 91 days, the compressive strength is slightly greater than that for the control group (glass powder is 0%). When the water-binder ratios are 0.47, 0.59 and 0.71, the compressive strength of the various replacements increases by 1.38-1.61 times, 1.56-1.80 times and 1.45-2.20 times, respectively, during the aging process from day 7 to day 91. Furthermore, a prediction model of the compressive strength of a cement mortar with waste LCD glass powder was deduced in this study. According to the comparison between the prediction analysis values and test results, the MAPE (mean absolute percentage error) values of the compressive strength are between 2.79% and 5.29%, and less than 10%. Thus, the analytical model established in this study has a good forecasting accuracy. Therefore, the proposed model can be used as a reliable tool for assessing the design strength of cement mortar from early age test results.

Keywords

References

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