Backcalculation of the roller-compacted concrete pavement structure with cement and special additives stabilized base layers

Abstract

Slip-form concrete (JPCP) has demonstrated reliable performance over many years. An alternative to slip-form concrete is roller-compacted concrete (RCC), which contains a higher proportion of fine aggregates. RCC offers strength and performance equal to or exceeding that of conventional concrete. In Lithuania, RCC pavement structures typically incorporate a base (CTB) and a subbase stabilized with cement and special additives (CTS). The main objective of this research was to evaluate the modulus of elasticity of CTB and CTS, which is one of the most important mechanical properties in the mechanistic–empirical pavement design method. In light of that bearing capacity tests with falling weight deflectometer were performed on local road directly on CTB, CTS and after installation of RCC. Deflections were used in evaluation of the CTB and CTS modulus of elasticity. The results showed increased stability of the E modulus in the CTS and CTB after installation of RCC