Creep and drying shrinkage of a blended slag and low calcium fly ash geopolymer Concrete
Tóm tắt
The main purpose of this research is to study the time dependent behaviour of a geopolymer concrete. The geopolymer binder is composed of 85.2 % of low calcium fly ash and only 14.8 % of ground granulated blast furnace slag. Both drying shrinkage and creep are studied. In addition, different curing conditions at elevated temperature were used. All experimental results were compared to predictions made using the Eurocode 2. The curing regime plays an important role in the magnitude and development of both creep and drying shrinkage of class F fly ash based geopolymer concrete. A minimum of 3 days at 40 °C or 1 day at 80 °C is required to obtain final drying shrinkage strains similar to or less than those adopted by Eurocode 2 for ordinary Portland cement (OPC) concrete. Creep strains were similar or less than those predicted by Eurocode 2 for OPC concrete when the geopolymer concrete was cured for 3 days at 40 °C. After 7 days at 80 °C, creep strains became negligible.
Tài liệu tham khảo
Malhotra VM (2002) High-performance high-volume fly ash concrete. Concr Int 24:30–34
Struble J, Godfrey J (2004) How sustainable is concrete? In: International workshop on sustainable development and concrete technology, Beijing, May 20–21, pp 201–211
Gartner E (2004) Industrially interesting approaches to “low-CO2” cements. Cem Concr Res 34:1489–1498
Josa A, Aguado A, Heino A, Byars E, Cardim A (2004) Comparative analysis of available life cycle inventories of cement in the EU. Cem Concr Res 34:1313–1320
CIF (2011) Cement industry federation response to the clean energy bill 2011 and related legislation. Report. Cement Industry Federation
Duxson P, Fernández-Jiménez A, Provis JL, Lukey GC, Palomo A, van Deventer JSJ (2007) Geopolymer technology: the current state of the art. J Mater Sci 42(9):2917–2933
Ng TS, Voo YL, Foster SJ (2012) Sustainability with ultrahigh-performance and geopolymer concrete construction. In: Fardis MN (ed) Innovative materials and techniques in concrete construction: ACES workshop. Springer, Dordrecht, pp 81–100
Ng TS, Foster SJ (2012) Development of a mix design methodology for high-performance geopolymer mortars. Struct Concr 14(2):148–156
Xu H, Provis JL, van Deventer JSJ, Krivenko PV (2008) Characterization of Aged slag concretes. ACI Mater J 105(2):131–139
Davidovits J (1991) Geopolymers: inorganic polymeric new materials. J Therm Anal 37:1633–1656
Aly T, Sanjayan JG (2010) Effect of pore-size distribution on shrinkage of concretes. J Mater Civ Eng 22(5):525–532
Lloyd NA, Rangan BV (2010) Geopolymer concrete with fly ash. In: 2nd international conference on sustainable construction materials and technologies, pp 1493–1504
Provis JL, van Deventer JSJ (2009) Geopolymers: structures, processing, properties, and industrial applications. Woodhead Publishing Limited, Cambridge
Sagoe-Crentsil K (2009) Role of oxide ratios on engineering performance of fly-ash geopolymer binder systems. Ceram Eng Sci Proc 29(10):175–184
Fernandez-Jimenez AM, Palomo A, Lopez-Hombrados C (2006) Engineering properties of alkali-activated fly ash concrete. ACI Mater J 103(2):106–112
Sofi M, van Deventer JSJ, Mendis PA (2007) Engineering properties of inorganic polymer concretes (IPCs). Cem Concr Res 37:251–257
Wallah SE (2010) Creep behaviour of fly ash based geopolymer concrete. Civ Eng Dimens 12(2):73–78
Wallah SE, Rangan BV (2006) Low calcium fly ash based geopolymer concrete: long term properties. Faculty of Engineering, Curtain University of Technology, Perth, Australia
AS3600 (2009). Concrete structures. Standards-Australia
Sagoe-Crentsil K, Taylor A, Brown T (2013) Drying shrinkage and creep performance of geopolymer concrete. J Sustain Cem-Based Mater 2(1):35–42
ASTM C157 (2009) Standard test method for length change of hardened hydraulic-cement mortar and concrete
Palomo A, Grutzeck MW, Blanco MT (1999) Alkali-activated fly ashes A cement for the future. Cem Concr Res 29:1323–1329
AS 1012.9 (1999). Methods of testing concrete—determination of the compressive strength of concrete. Standards-Australia
AS1012.13 (1992) Methods of testing concrete—determination of drying shrinkage of concrete for samples prepared in the field or in the laboratory. Standards-Australia
Pan Z, Sanjayan JG, Collins F (2014) Effect of transient creep on compressive strength of geopolymer concrete for elevated temperature exposure. Cem Concr Res 56:182–189
AS1012.16 (1996) Methods of testing concrete—determination of creep of concrete cylinders in compression. Standards-Australia
EN 1992-1-1 (2004) Eurocode 2: design of concrete structures—part 1–1: general rules and rules for buildings
Collins F, Sanjayan JG (2000) Effect of pore size distribution on drying shrinkage of alkali activated slag concrete. Cem Concr Res 30(9):1401–1406
Kovalchuk G, Fernandez-Jimenez A, Palomo A (2007) Alkali-activated fly ash: effect of thermal curing conditions on mechanical and microstructural development—part II. Fuel 86:315–322
Gilbert RI (2002) Creep and shrinkage models for high strength concrete—proposal for inclusion in AS3600. Austr J Struct Eng 4:95–106
Gilbert RI, Ranzi G (2011) Time-dependent behaviour of concrete structures. Spon, London, p 426
Vandamme M, Ulm F-J (2009) Nanogranular origin of concrete creep. Proc Natl Acad Sci 106(26):10552–10557
Bažant ZP, Hauggaard AB, Baweja S, Ulm F (1997) Microprestress-solidification theory for concrete creep. I: aging and drying effects. J Eng Mech 123(11):1188–1194
Ferraris CF, Wittmann FH (1987) Shrinkage mechanisms of hardened cement paste. Cem Concr Res 17(3):453–464
Castel A, Gilbert RI, Ranzi G (2014) Instantaneous stiffness of cracked reinforced concrete including steel-concrete interface damage and long-term effects. ASCE J Struct Eng 140(6):04014021