Authors : A.C. Apata; U.U. Imoh

Volume/Issue : Volume 7 - 2022, Issue 1 - January

Google Scholar : http://bitly.ws/gu88

Scribd : https://bit.ly/3BnCYKD

DOI : https://doi.org/10.5281/zenodo.6090934

Abstract : The frequent failure of roadways in Nigeria is of great concern to highway users, particularly highway engineers. Some factors contributing to this situation include lack of adequate pavement/road maintenance programme. Traditionally, the material used in pavement maintenance operations is hot mix asphalt concrete (HMA). However, the use of cold patch imported from South Africa as seal coat in road maintenance in Lagos is becoming increasingly popular. Apart from the literature accompanying the products and which specify some properties and products advantages, there is no reported investigation into the engineering characteristics and likely performance of these products in Nigeria. In this study, HMA and cold patch materials were investigated. Tests carried out on the materials include bitumen content estimation (HMA, cold patch), gradation of aggregates (HMA, cold patch), Marshall stability and flow (HMA) and specific gravity, density and voids analysis (HMA). From the limited investigations conducted in this study, it was concluded that, the HMA mixtures were generally satisfactory, the aggregates recovered from cold patch samples did not conform to the FMW gradation specifications for either wearing course or binder course. The binder content in the cold patch was also too high for normal asphalt mixtures. Consequently, it was recommended that the use of cold patch for pavement maintenance in Lagos State should be with caution until more investigations are conducted.

Keywords : Cold Patch, Hot Asphalt Mixes (HMA), Pavement, Maintenance and Highway