Title: Mix Proportioning and Properties of Roller-Compacted Concrete Pavement Using Lignite Fly Ash
Author(s): Somnuk Tangtermsirikul and Yukio Aoyagi
Publication: Symposium Paper
Appears on pages(s): 769-784
Keywords: Abrasion resistance; flexural strength; fly ash; mix proportioning; roller
compacted concrete; shrinkage
This paper explains the development of a roller-compacted concrete for constructing or renovating concrete pavement (RCCP), using lignite fly ash in Thailand. A method for proportioning the lignite fly ash RCCP based on the ratio, y, between paste volume and void content of total aggregate is proposed. It was found from the tests conducted by varying fly ash replacement ratio, water to total binder ratio, and paste content that the range of value of y which gives rise to optimum strength and density of the RCCP were in between 1.02 and 1.05 for the tested materials. The design curves for compressive strength were derived based on test results with varied fly ash replacement ratio and water to total binder ratio of the RCCP with y being equal to 1.02. Some selected RCCP mixtures were compared with conventional concrete for constructing pavement in terms of flexural strength, drying shrinkage and abrasion resistance. The tested RCCP specimens were found to have higher flexural strength than the ACI-proposed formula for conventional concrete. Drying shrinkage of RCCP was smaller than that of the conventional concrete and was even smaller when lignite fly ash replacement ratios were larger. Similar to the conventional concrete, the abrasion resistance of the RCCP was found to have a good correlation with compressive strength.