A comparison of flexural strengths of polymer (SBR and PVA) modified, roller compacted concrete
This brief article aims to reveal the flexural performance, including the equivalent flexural strength of PVA (Polyvinyl Alcohol) modified concrete by comparing it primarily with that of SBR (Styrene Butadiene Rubber) concrete. This data article is directly related to Karadelis and Lin [6].
A new mix design method for steel fibre-reinforced, roller compacted and polymer modified bonded concrete overlays
Abstract For roller compacted concrete used in pavements, optimal water content is one of main concerns for mix design. However the mix design method aiming at achieving both high bond strength and roller compactability is not available so far. The modified Proctor compaction method and modified Vebe method were investigated and found to be inappropriate to the type of mixes in terms of durability. In this paper a method for determining optimal water content is proposed for steel fibre-reinforced, roller compacted and polymer modified bonded concrete overlays. Two types of mixes suitable for asphalt paver placement and roller compaction were developed: They were the SBR and the SBR–PVA hybrid polymer modified cement concrete mixes with the optimal water contents determined by the proposed method. Both mixes achieved good bond with the old concrete substrate.
Experimental study on bond behavior between high-strength grout and deformed steel bars
Abstract Engineers use high-strength grout to connect precast concrete members for its low shrinkage and good fluidity. This paper designed 87 central pull-out specimens using the control variable method to investigate the influence of factors on the rebar-grout bond property such as compressive strength, steel grade, bar diameter, transverse stirrups, and bond length. The test result showed that improving grout compressive strength (85.8 MPa–122.7 MPa) cannot improve the bond strength, which was different from the previous conclusions of concrete pull-out tests. Simplified formulas were presented for calculating the characteristic values of bond strength, residual strength, peak slip, and relative slip of load-holding platform based on parameter analysis. Then, a constitutive model was proposed to predict the full-range bond stress-slip curve of high-strength grout and steel bar specimens from bearing to failure. Finally, FEA models were established to evaluate the applicability and accuracy of the constitutive model.