A study on asphalt pavements by using RAP, sand & UFS mixtures as replacements

Abstract

The centre of this study is concentrated on introducing the lean ideas in asphalt pavement construction particularly in the Quality control (QC) process in HMA. HMA comprises of nearly 95% of aggregate, gravel or sand, filler and these ingredients are binding together with bitumen a by-product from crude oil industry. The aim of the present study is to compare the strength in terms of stability and flow value of Conventional & Non-conventional mix by Marshal Stability test. The present study relates Usage of RAP to reduce the fresh aggregate in the proposed Mix without influencing the properties of mix, from the test results we are adopting 10 % RAP with 90 % fresh aggregate for NCM mixes.VG 30 grade bitumen is used as binder and Maximum aggregate size (MAS) 23.0 mm and Nominal Maximum Aggregate size (NMAS) 19.0 mm. Cement is used as filler for conventional mixes, while UFS, Sand is used as filler for NCM-II and NCM-III respectively. And finally, 1 % lime in the weight of bitumen used as antistripping agent to minimise moisture susceptibility or to increase the resistance to moisture sensitivity of the proposed mix. From this study we are observed NCM –II shows better results than other Non-conventional mixes, the stability values are slightly lesser than conventional mix, other Marshall properties are far better than conventional ones. The optimum binder content (OBC) is 5.68 for NCM – II, which is lesser than Conventional mix 5.72.