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.
PFA fineness and its use in concrete
The object of the investigation was to determine a satisfactory method of assessing the Jineness of pulverized fly-ash (PFA) which provided a reasonable correlation with the workability of concretes with similar compositions except for the type of fly-ash used. Neither the standard air permeability tests nor the residue on a 45 μm sieve were found to provide a good indication of the complete size distribution of a fly-ash. The air permeability provides a value which does not necessarily vary with the specific surface, and the 45 μm sieve merely considers the division at one size only. However, if an accurate assessment of the size distribution is expressed in terms of a simple parameter such as the grading modulus, the latter then shows very good correlation with the workability of the resultant PFA concretes, as indicated by the VB time. A useful indication of the potential strength of the PFA concrete could also be given by the grading modulus.