A study on the properties of cement grouted open-graded bituminous concrete with brick as aggregates

Abstract

Cement grouted open graded bituminous mixes are cement slurry injected bituminous mixes which had 20 to 35% air void initially. This paper studies the effect of air voids, water-cement ratio and aggregate type on the performance of cement grouted macadam. Natural stone aggregates, crushed first-class brick aggregates and crushed overburnt brick aggregates are used in this analysis with three different air voids (18%, 21%, and 24%) and with three different cement grouts (0.5w/c, 0.6w/c, and 0.7w/c). Grouted samples with 24% air voids show superior performance followed by 21% and 18% air void samples, respectively. A reduction of up to 35.33% in rut depth and an increase up to 144.55% in fatigue life was recorded for grouted macadam when compared with conventional mixes. It was also observed that the grouted macadam has higher Marshall stability, rut resistance, fatigue life and moisture susceptibility than the conventional mixes.