Preparation and properties of geopolymer-lightweight aggregate refractory concrete

Abstract

Geopolymer-lightweight aggregate refractory concrete (GLARC) was prepared with geopolymer and lightweight aggregate. The mechanical property and heat-resistance (950 °C) of GLARC were investigated. The effects of size of aggregate and mass ratio of geopolymer to aggregate on mechanical and thermal properties were also studied. The results show that the highest compressive strength of the heated refractory concrete is 43.3 MPa, and the strength loss is only 42%. The mechanical property and heat-resistance are influenced by the thickness of geopolymer covered with aggregate, which can be expressed as the quantity of geopolymer on per surface area of aggregate. In order to show the relationship between the thickness of geopolymer covered with aggregate and the thermal property of concrete, equal thickness model is presented, which provides a reference for the mix design of GLARC. For the haydite sand with size of 1.18–4.75 mm, the best amount of geopolymer per surface area of aggregate should be in the range of 0.300–0.500 mg/mm².

Keywords

refractory concrete / geopolymer / lightweight aggregate / thermal property / equal thickness model

References

[1] ZhuH.-j., ChengH.-l., JiangD.-min.Special concrete and new concrete[M], 2004, Beijing, Chemical Industry Press: 153-169

[2] ChanS. Y. N., PengG. F., AnsonM.. Fire behavior of high-performance concrete made with silica fume at various moisture contents[J]. ACI Materials Journal, 1999, 96(3): 405-409

[3] SellevoldE. J.. Mercury porosimetry of hardened cement paste cured or stored at 97 °C[J]. Cement and Concrete Research, 1974, 4(3): 399-404

[4] TurkerP., ErdogduK., ErdoganB.. Investigation of the various type of aggregate mortar exposed to fire[J]. Journal of Cement Concrete World, 2001, 6(31): 52-69

[5] LINGARD J, HAMMER T A. Fire resistance of structural lightweight aggregate concrete: A literature survey with focus spalling[EB/OL]. https://doi.org/www.itn.is/ncr/publications. 2004-04-04.

[6] GuoZ.-h., ShiX.-dong.Behavior of reinforced concrete at high temperature and its calculation[M], 2003, Beijing, Tsinghua University Press

[7] DingF.-x., YuZ.-wu.. Behavior of concrete and concrete-filled circular steel tubular stub columns at constant high temperatures[J]. Journal of Central South University of Technology, 2006, 13(6): 726-731

[8] KhalafF. M., DevennyA.. Performance of brick aggregate concrete at high temperatures[J]. Journal of Materials in Civil Engineering, 2004, 16(6): 556-565

[9] ChengF., KodurV. K. R., WangT. C.. Stress—strain curves for high strength concrete at elevated temperatures[J]. Journal of Materials in Civil Engineering, 2004, 16(1): 84-90

[10] NevilleA. M.Properties of concrete[M], 1995, London, Longman Group

[11] GulR., BingolF.. General aspects of concrete resistant to fire[J]. DSI Tech Bull, 2000, 299: 3-8

[12] KongF. K., EvansR. H., CohenE., RollF.Handbook of structural concrete[M], 1983, London, Pitman Books Limited

[13] AbelesP. W., Bardhan-RoyB. K.Prestressed concrete designer’s handbook[M], 2003, London, Spon Press

[14] DavidovitsJ.. Geopolymers and geopolymeric materials[J]. Journal of Thermal Analysis, 1998, 35: 429-441

[15] ProvisJ. L., DuxsonP., van DeventerJ. S. J., LuceyG. C.. The role of mathematical modeling and gel chemistry in advancing geopolymer technology[J]. Chemical Engineering Research and Design, 2005, 83(7): 853-860

[16] XuH., van DeventerJ. S. J.. The geopolymerisation of alumino-silicate minerals[J]. International Journal of Mineral Processing, 2000, 59: 247-266

[17] BakharevT.. Thermal behaviour of geopolymers prepared using class F fly ash and elevated temperature curing[J]. Cement and Concrete Research, 2006, 36: 1134-1147

[18] KomnitsasK., ZaharakiD.. Geopolymerisation: A review and prospects for the minerals industry[J]. Minerals Engineering, 2007, 20: 126-127

[19] SancakE., SariY. D., SimsekO.. Effects of elevated temperature on ompressive strength and weight loss of the lightweight concrete with silica fume and superplasticizer[J]. Cement and Concrete Composites, 2008, 30: 715-721

[20] MethaP. K.. Building durable structures in 21st century[J]. Concrete International, 2001, 3: 5-8

[21] FengN.-qian.High performance concrete structure[M], 2004, Beijing, China Machine Press: 11

[22] RileyM. A.. Possible new method for the assessment of fire damaged concrete[J]. Mag Concr Res, 1991, 43: 87-92

[23] SaadM., Abo-El-EneinS. A., HannaG. B., KotkataM. F.. Effect of temperature on physical and mechanical properties of concrete containing silica fume[J]. Cement and Concrete Research, 1996, 26(5): 669-675