Effect of CRT glass and TiO2 as a replacement for fine aggregate and cement on properties of pervious concrete paving flags

Abstract

In the subject of pavement engineering, real-life conditions must be recreated using carefully selected materials and techniques. This is especially true for the evaluation of non-standard, waste materials prior to their usage in pavement structure. The objective of this study is to ascertain the effects of partial cement replacement with cost-effective micro TiO2 and full fine aggregate replacement with CRT (cathode ray tube) glass on the characteristics of pervious concrete paving flags and their capacity to reduce pollutants carried by rainwater. Within the research, standard test methods for paving flags characterisation are used (EN 1339) along with some new and innovative research approaches to environmental impact assessment simulating real-life conditions. Results indicate a high influence of used materials on pervious concrete properties, both separately and combined. When applied separately, CRT glass and TiO2 exhibited reduced bending strength; however, when put together, bending strength improved. TiO2 decreased the unpolished slip resistance value (USRV) of flags while CRT glass reduced wear resistance. Although the infiltration rate was greatly improved, neither component had a substantial impact on water absorption. Environmental impact assessment results support the safety of use of both materials in paving flags. Finally, by using CRT glass and micro TiO2, innovative, environmentally friendly, and cost-effective paving product can be produced for sustainable development improvement within pavement engineering.