Reducing cementitious paste volume of slipformed pavement concrete by blending aggregates

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.

Mitigation of Additional Overdesign in Portland Cement Concrete by Optimizing the Cementitious Materials Content

“…The cementitious content in concrete can be reduced by 25% without compromising the compressive strength and consistency. Such reductions can be achieved by optimizing binary and ternary aggregate systems (ANTUNES, 2018;ANTUNES and TIA, 2018a;ANTUNES and TIA, 2018c;CHUNG AND TIA, 2021;CHUNG et al, 2020).…”

Study on the Effect of Vibrating Process on the Compactness of Slipform Concrete

“…Cook proposed the Box-Test method to evaluate the workability of slipform concrete after high-frequency vibration [17]. For slipform concrete, its construction performance has a close relationship with the concrete mix ratio [18][19][20], but also with the vibration frequency, radius of action, and amplitude of the vibrating rod. This discovery has an important role in guiding the improvement of the smoothness of slipform concrete and the prevention of caving in the actual construction process [21].…”