DEVELOPMENT OF A NEW CEMENTITIOUS FILLER FOR USE IN FAST-CURING COLD BINDER COURSE IN PAVEMENT APPLICATION

摘要

This Paper introduces a laboratory study results on developing fast-curing cold mix asphalt using new cementitious filler generated from waste fly ashes and waste by-product materials to replace the traditional limestone filler normally in use for producing asphalt mixtures. The new products meet the challenges of the increasingly strict traffic and environmental regulations and budgetary restrictions the paving industry faces in the coming years by providing; 1. Fast-curing cold mix asphalt and thus eliminating the restriction imposed by road engineers on the use of cold mix asphalt, namely the needs of such mixes for long curing time. Normally spans from 2 months to 24 months. 2. Environmentally friendly product as the mixing and manufacturing process need no heating and thus no CO_2 emission, further more; 3. Waste fly ashes and waste by-product materials are blended and used for the production of the new LJMU cementitious filler with no heating and or heavy blending process are involved and thus, the production of the new contentious filler has no CO_2 emissions too. The paper reports analyse and discussion of the SEM laboratory investigations on the cementitious paste making the bonding agent in the mix together with the responses of the new cold mix asphalt binder course to the code of practise testing recommended by road engineers namely; indirect tensile stiffness modulus test. The results proves that the performance of the new products are complying with the European code of practice for the test accomplished and open the gate for further testing recommended by the code of practice which will be reported in another paper to be published in the near future.