In this study, the benefits of limestone powder (LP), basalt powder (BP) and marble powder (MP) as partial replacement of Portland cement are established. Furthermore, LP, BP and MP are used directly without attempting any additional processing in the production of self-compacting concrete (SCC). The water to binder ratio is maintained at 0.33 for all mixtures. The examined properties include workability, air content, compressive strength, ultrasonic pulse velocity, and static and dynamic elastic moduli. Workability of the fresh concrete is determined by using both the slump-flow test and the L-box test. The results show that it is possible to successfully utilize waste LP, BP and MP as mineral admixtures in producing SCC. Due to its observed mechanical advantages, the employment of waste mineral admixtures improved the economical feasibility of SCC production on a unit strength basis.

Effect of mineral admixtures on properties of self-compacting concrete

Performance of new viscosity modifying admixtures in enhancing the rheological properties of cement paste

The wet packing method developed in Part 1 [Wong HHC, Kwan AKH (2007) Packing density of cementitious materials: part 1 measurement using a wet packing method. Mater Struct (Paper No. MAAS3281)] has been successfully applied to measure the packing densities of cementitious materials containing ordinary Portland cement (OPC), pulverised fuel ash (PFA) and condensed silica fume (CSF). The test results for non-blended materials revealed that whilst the addition of a superplasticiser would always increase the packing densities of OPC and PFA, the addition of a polycarboxylate-based superplasticiser could decrease the packing density of CSF. On the other hand, the results for blended materials showed that the packing density could be improved by double blending OPC with either PFA or CSF, and further improved by triple blending OPC, PFA and CSF together in appropriate proportions. A maximum packing density of 0.752 has been achieved and a ternary packing density diagram for determining the mix proportions for maximum packing density has been produced. Furthermore, the positive influence of a higher packing density on cement paste rheology has been demonstrated using the mini-slump cone test. Based on these results, the concept of excess water ratio, which is the major factor governing the rheology of a paste, is introduced.

Packing density of cementitious materials: part 2—packing and flow of OPC + PFA + CSF

Durability and mechanical properties of self-compacting concrete incorporating palm oil fuel ash

Sustainable use of copper slag in self compacting concrete containing supplementary cementitious materials

Self-compacting concrete was first developed 1988 in order to achieve durable concrete structures. Since then, various investigations have been carried out, and the concrete has been used in practical structures in Japan, mainly by large construction companies. Investigations for establishing a rational mix design method and self-compactability testing methods have been carried out from the viewpoint of making it a standard concrete. In addition to Japan, investigations have been started in many countries, and it has been applied to practical structures especially in Canada, Sweden, The Netherlands, Thailand and Taiwan. Recommendations and manuals for self-compacting concrete have also been published in Japan. In this article, the current condition of self-compacting concrete is summarized based on reports given at the International Workshop on Self-compacting Concrete, Kochi, Japan, in 1998.

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M. Ouchi

Papers

Self-compacting concrete