Effect of Four Iranian Natural Pozzolans on Concrete Durability Against Sulfate Attack

Document Type : Research Article

Authors

1 Professor, Department of Civil and Environmental Engineering, Amirkabir University of Technology

2 M.Sc. Student, Department of Civil and Environmental Engineering, Amirkabir University of Technology

3 Lecturer, Department of Civil and Environmental Engineering, Amirkabir University of Technology

Abstract

Sulfate attack is one of the most important problems concerning the durability of concrete structures. Natural pozzolans are the natural mineral admixtures which can improve concrete durability against sulfate attack. In this paper, the sulfate resistance of concrete and mortar samples made from ordinary Portland cement containing three different portions of four types of natural pozzolans (Eskandan Pumice, Khash Pumice, Abyek Tuff and Jajrood Trass) was studied. Strength reductions and mass changes of the concrete samples, immersed in sodium sulfate solution, as well as the expansion of mortar prisms, immersed in sodium and magnesium sulfate solutions, were monitored. It was observed that the resistance of mixtures containing natural pozzolans was higher against both sodium sulfate and magnesium sulfate attacks compared to the reference cement.

Keywords

References

[1] رمضانیانپور، علی اکبر؛ پرهیزکار، طیبه؛ قدوسی،پرویز؛ پورخورشیدی، علیرضا، ”توصیه هایی برای پایایی بتن در سواحل جنوبی کشور )نشریه شماره 396 ) ، مرکز تحقیقات ساختمان و مسکن، تهران، 1383 ، ایران.
[2] ASTM Standard C150, “Standard specification for Portland cement”, vol 04.01 ASTM Publication, United States, 1995.
[3] Irassar, F.; Gonzalez, M.; Rahhal, V.; “Sulfate resistance of type V cements with limestone filler and Natural Pozzolan”, Cement and Concrete Composites, pp. 361- 802, 2000.
[4] محمدی منش، مجتبی، ”بررسی خواص مکانیکی و دوام بتن های ساخته شده با پوزولان طبیعی پومیس “، پایان نامه کارشناسی ارشد، دانشگاه صنعتی امیرکبیر، تهران، 1383 ، ایران.

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