Download Advances in Cement-Based Materials: Proc. Int. Conf. by Gideon P.A.G. Van Zijl, Billy P. Boshoff PDF

By Gideon P.A.G. Van Zijl, Billy P. Boshoff

Collection of chosen papers on present advances in excessive functionality building fabrics. Contributions take care of the improvement, characterization, program systems, functionality and structural layout of fabrics with key strength in civil engineering works. fabrics handled are fibre strengthened concrete, excessive functionality concrete, self compacting concrete and novel mixtures of those. For researchers, practitioners, specialists, contractors and suppliers.

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Read or Download Advances in Cement-Based Materials: Proc. Int. Conf. Advanced Concrete Materials, 17-19 Nov. 2009, Stellenbosch, South Africa PDF

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Extra info for Advances in Cement-Based Materials: Proc. Int. Conf. Advanced Concrete Materials, 17-19 Nov. 2009, Stellenbosch, South Africa

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From the above results it can be seen that though unsupported by the prevailing theories in ultra high performance material design, rice husk ash can play an important role in designing more sustainable materials for the future. Even if functioning simply as a material included to increase the yield of a mixture, RHA is effective at maintaining, if not increasing compressive strength. Additionally, by decreasing the density of the matrix while maintaining both stiffness and compressive strength at lower water-binder ratios, the inclusion of RHA could mean reduced dead-weight in elements made therefrom, potentially reducing transport weight in precast elements while maintaining the desired performance.

This can be expected since there is less cement and therefore less unhydrated cement in the matrix, which can result in lower modulus, as unhydrated cement has been attributed as a stiffening factor in low water-binder ratio mixtures (O’Neil, 2008). If RHA is to be used as a cement replacement, we recommended that no more than 10% be replaced for high performance mixtures, as the Young’s modulus is an important factor for structural design. 5 ACKNOWLEDGEMENTS The authors would like to express their gratitude to the US Army Engineer Research and Development Center for funding this work, Dr.

Also, variations in the moisture content of the aggregates and, especially, of the filler significantly influence the stability of the SCC, implying several adjustments in the mix design. Additionally, the use of extra fines (filler) implies, sometimes, new silos along with further control of the concrete in the plant. Therefore, this, along with the high contents of cement usually used, lead to an increase in production costs. Consequently, the use of SCC as an “every-day concrete” is, nowadays, difficult especially in the case of the Ready Mixed Concrete Industry.

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