Role of compaction on the properties of pervious concrete made with local aggregates

Abstract

The global shortage of regular construction materials has encouraged researchers to find out an alternative, and crushed over-burnt brick aggregates (COBBA) can be a suitable option. This study aims to use COBBA in pervious concrete (PC) and checks the effect of compaction on the properties of PC. Pervious concrete is desired to have a sufficient amount of voids, while it is also expected to have some strength. This study particularly focuses on this bi-functional aspect through several experimental tests. The compaction is done with a standard Proctor hammer by varying the number of blows. For larger aggregates, PC made with 40 compaction blows showed compressive strength and porosity of about 12 MPa and 15%, respectively, whereas, for smaller aggregates, PC made with only 25 blows can show a compressive strength of around 16 MPa and a porosity value of about 18%. Based on porosity, permeability, and compressive strength, the optimum number of compaction blows is also identified for various sizes of coarse aggregate. Finally, statistical analysis is carried out and some equations are proposed to estimate the pore parameters and strength of the PC mix made with COBBA with an accuracy of about 97-98%.