A laboratory investigation of steel to fly ash-based geopolymer paste bonding behavior after exposure to elevated temperatures

Abstract Geopolymers are generally agreed to provide good steel-to-concrete bonding performance and fire resistance. However, few previous studies on geopolymer investigated the steel-to-concrete bonding behavior and fire-resistance at very high temperatures (>800 °C), hence cannot reveal the damage of a severe fire accident. This paper presents the results of an extensive experimental study carried out to investigate the effect of elevated temperature on the thermal-physical behaviors and mechanical properties of fly ash-based geopolymer paste. After being exposed up to 1200 °C according to the RATB fire curve, the damage stages of geopolymer paste (GPC) and ordinary Portland cement (OPC) were investigated through the unconfined compressive strength test, push-out test, thermogravimetric analysis (TGA), differential thermal analysis (DTA) and scanning electron microscopy (SEM) analysis. Based on the results and existing literature, there was a less mass loss and a better compressive strength for GPC paste after the treatment, which led to a better bonding behavior of GPC compared with OPC paste. In addition, a positive linear relationship between the bond strength and the compressive strength was found for both GPC and OPC. Furthermore, the stable properties of phases change and porous micro-structure in GPC identified by SEM and XRD methods were important for a better bond behavior at elevated temperatures. Thus, the GPC offers a feasible alternative to OPC in practical fire-resistant building applications.

[1]  Rami H. Haddad,et al.  Post-fire behavior of bond between high strength pozzolanic concrete and reinforcing steel , 2004 .

[2]  Muhammad N. S. Hadi,et al.  Bond of high strength concrete with high strength reinforcing steel , 2008 .

[3]  H. Yong,et al.  Review of Geopolymer Behaviour in Thermal Environment , 2017 .

[4]  Alaa M. Rashad,et al.  Metakaolin as cementitious material: History, scours, production and composition – A comprehensive overview , 2013 .

[5]  Sublimation of vertically oriented paradichlorobenzene cylinders in a natural convection environment , 2012 .

[6]  Keun-Hyeok Yang,et al.  Properties of cementless mortars activated by sodium silicate , 2008 .

[7]  Hui Peng,et al.  Mechanical and thermal properties of fly ash based geopolymers , 2018 .

[8]  J. W. Ju,et al.  Development of a novel bio-inspired cement-based composite material to improve the fire resistance of engineering structures , 2019, Construction and Building Materials.

[9]  R. Royles,et al.  Further responses of the bond in reinforced concrete to high temperatures , 1983 .

[10]  Priyan Mendis,et al.  Bond performance of reinforcing bars in inorganic polymer concrete (IPC) , 2007 .

[11]  A. Rashad.  Insulating and fire-resistant behaviour of metakaolin and fly ash geopolymer mortars , 2019, Proceedings of the Institution of Civil Engineers - Construction Materials.

[12]  A. Sofianos,et al.  Behaviour of Passive Fire Protection K-Geopolymer under Successive Severe Fire Incidents , 2015, Materials.

[13]  J. C. Swanepoel,et al.  Utilisation of fly ash in a geopolymeric material , 2002 .

[14]  P. Michaud,et al.  Influence of raw materials and potassium and silicon concentrations on the formation of a zeolite phase in a geopolymer network during thermal treatment , 2012 .

[15]  Hehua Zhu,et al.  Numerical study on the smoke control using point extraction strategy in a large cross-section tunnel in fire , 2018, Tunnelling and Underground Space Technology.

[16]  S. Agarwal,et al.  Physicochemical, mineralogical, and morphological characteristics of concrete exposed to elevated temperatures , 2002 .

[17]  Kwesi Sagoe-Crentsil,et al.  Comparative performance of geopolymers made with metakaolin and fly ash after exposure to elevated temperatures , 2007 .

[18]  Bhupinder Singh,et al.  Geopolymer concrete: A review of some recent developments , 2015 .

[19]  P. P. Nomikos,et al.  Potassium based geopolymer for passive fire protection of concrete tunnels linings , 2014 .

[20]  Katherine A. Taconi,et al.  Homeoviscous response of Clostridium pasteurianum to butanol toxicity during glycerol fermentation. , 2014, Journal of biotechnology.

[21]  Fazhou Wang,et al.  Preparation and properties of geopolymer-lightweight aggregate refractory concrete , 2009 .

[22]  J.S.J. van Deventer,et al.  The potential use of geopolymeric materials to immobilise toxic metals: Part II. Material and leaching characteristics , 1999 .

[23]  Venkatesh Kodur,et al.  Thermal behavior and mechanical properties of geopolymer mortar after exposure to elevated temperatures , 2016 .

[24]  I. Hager,et al.  Behaviour of cement concrete at high temperature , 2013 .

[25]  Éva Lublóy,et al.  TEMPERATURE EFFECTS ON BOND BETWEEN CONCRETE AND REINFORCING STEEL , 2014 .

[26]  L. Jendele,et al.  Finite element modelling of reinforcement with bond , 2006 .

[27]  G. Khoury.  Effect of fire on concrete and concrete structures , 2000 .

[28]  Le Huang,et al.  Finite element modeling of steel-polypropylene hybrid fiber reinforced concrete using modified concrete damaged plasticity , 2017 .

[29]  P. Mondal,et al.  Micro- and nano-scale characterization to study the thermal degradation of cement-based materials , 2014 .

[30]  Jay G. Sanjayan,et al.  Effect of elevated temperatures on geopolymer paste, mortar and concrete , 2010 .

[31]  V. Kodur,et al.  Development of metakaolin–fly ash based geopolymers for fire resistance applications , 2014 .

[32]  Izabela Hager,et al.  Colour Change in Heated Concrete , 2014 .

[33]  V. Bílek,et al.  Bond Strength Between Reinforcing Steel and Different Types of Concrete , 2017 .

[34]  Baoshan Huang,et al.  Strength, microstructure, efflorescence behavior and environmental impacts of waste glass geopolymers cured at ambient temperature , 2020 .

[35]  K. K. Bandyopadhyay,et al.  Thermal degradation of concrete in the temperature range from ambient to 315{degree} C (600{degree} F). Revision 10/96 , 1996 .

[36]  V. Kodur,et al.  Comparative Thermal and Mechanical Performance of Geopolymers derived from Metakaolin and Fly Ash , 2016 .

[37]  Omar A. Abdulkareem,et al.  Effects of elevated temperatures on the thermal behavior and mechanical performance of fly ash geopolymer paste, mortar and lightweight concrete , 2014 .

[38]  S. Diamond.  Identification of hydrated cement constituents using a scanning electron microscope energy dispersive X-ray spectrometer combination , 1972 .

[39]  Jian He,et al.  Geopolymer-Based Smart Adhesives for Infrastructure Health Monitoring: Concept and Feasibility , 2011 .

[40]  Zhaohui Huang,et al.  Modelling the bond between concrete and reinforcing steel in a fire , 2010 .

[41]  O. Jensen,et al.  Synthesis of pure Portland cement phases , 2009 .

[42]  Jingpei Li,et al.  Effect of mixed chlorides on the degradation and sulfate diffusion of cast-in-situ concrete due to sulfate attack , 2018, Construction and Building Materials.

[43]  Kwesi Sagoe-Crentsil,et al.  Factors affecting the performance of metakaolin geopolymers exposed to elevated temperatures , 2008 .

[44]  Alice Ergün,et al.  The effects of material properties on bond strength between reinforcing bar and concrete exposed to high temperature , 2016 .

[45]  Jose L. Torero,et al.  Behaviour of concrete structures in fire , 2007 .

[46]  P. Basheer,et al.  Chemical and Mechanical Stability of Sodium Sulfate Activated Slag after Exposure to Elevated Temperature , 2012 .

[47]  P. Sarker,et al.  Effect of fire exposure on cracking, spalling and residual strength of fly ash geopolymer concrete , 2014 .

[48]  Marta Castellote,et al.  Composition and microstructural changes of cement pastes upon heating, as studied by neutron diffraction , 2004 .

[49]  Prabir Sarker,et al.  Bond strength of reinforcing steel embedded in fly ash-based geopolymer concrete , 2011 .

[50]  L. Bockeria,et al.  ICVTS on-line discussion A. Commentary to the case study. , 2007, Interactive cardiovascular and thoracic surgery.