Abstract
A high cementitious paste volume (CPV) can increase the early cracking tendency of the concrete and reduce the durability of concrete pavement. This study investigated the effects of minimized CPV in slipformed pavement concrete (SPC) with blended aggregates (BA). Based on the laboratory results, the performance of pavement concrete with different CPV was evaluated. The CPV of standard SPC can be reduced to 25.0% without affecting its properties as evaluated by compressive strength, drying shrinkage and surface resistivity tests However, the CPV of SPC with optimized aggregate gradation (OAG) using BA technique can be further reduced to 22.5% with satisfactory properties. The SPC mixes with OAG was noted to have better potential performance as a pavement concrete. SPC concrete using Portland limestone cement can give similar properties as those of the conventional concrete using ordinary Portland cement.
Highlights
The concrete industry in Florida is facing two challenges, namely the rising cost of cement and the shortage of fly ash
Based on the American Association of State Highway and Transportation Officials (AASHTO) Designation: PP84-17 Developing for Performance Engineered Concrete Pavement Mixtures, the suitable paste volume should be lower than 25% for pavement concrete to mitigate cracking [6]
It can be concluded that the density results of portland limestone cement (PLC) concrete are close to those of the ordinary portland cement (OPC) concrete
Summary
The concrete industry in Florida is facing two challenges, namely the rising cost of cement and the shortage of fly ash. Hardened properties of PLC may be very similar to those of OPC in typical concrete mixes, but their use in mix designs incorporating optimized aggregate gradations and reduced paste contents needs investigation. Because of the lack of studies for evaluating the effect of CPV on the fresh and hardened properties of PLC concrete, it is important to assess the optimal CPV for PLC concrete to produce SPC concrete with sufficient properties To fill this knowledge gap, a research program was designed for PLC concrete incorporating BA technique to find out the optimal CPVs for SPC concrete. In this program, the concrete mixes were made using PLC, and the CPV was varied from 22.5% to 27.5 % and the w/cm ratio was 0.44. SiO2+Al2O3+Fe2O3, min, % CaO, max % SO3, max, % Moisture Content, max, % Loss on ignition, max, % Fineness, max, % Strength at 7 days, % Strength at 28 days, % Water requirement, % Autoclave expansion, max, % Density
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
