Document Type : Original Research Paper


1 School of Civil Engineering, Lovely Professional University, Phagwara, Punjab, India

2 Department of Civil Engineering, KG Reddy College of Engineering and Technology, Hyderabad


The efficiency of geo-polymer mortar is analyzed by replacing fine aggregates with different ratios of copper slag and crumb rubber. Properties such as flow value, setting time, strengthening properties, density, and water absorption are studied for different factors, i.e. molarities of sodium hydroxide (8, 10, and 12 M), various ratios of alkali-activator solution (1, 2, and 3), and the effect of pre-treating rubber. The results indicate that the increase in molarity increases the compressive strength, setting time, and flow value of mortar. It is observed that NaOH of 12 M and an alkali activator ratio of 2 show high compressive strength, which is 71.79 N/mm2. The rubber treated with alkali improves the bonding between the binder and the rubber, which leads to an increase in the material's strength by 7% for 1 hour and 10% for 24 hours, and density by about 1.5%. It is suggested that the optimum mix with 50% copper slag, 10% rubber with pre-treatment for a period of 1 hour, 12 M NaOH, and alkali activator ratio 2 provide excellent results among all mixes. In conclusion, the findings indicate that the produced mortar contributes to economic and ecological improvement.


[1]. Safiuddin, M.D., Alengaram, U.J., Salam, M.A., Jumaat, M.Z., Jaafar, F.F. and Saad, H.B. (2011). Properties of high-workability concrete with recycled concrete aggregate. Materials Research, 14: 248-255.
[2]. Bashar, I.I., Alengaram, U.J., Jumaat, M.Z. and Islam, A. (2014). The effect of variation of molarity of alkali activator and fine aggregate content on the compressive strength of the fly ash: Palm oil fuel ash based geopolymer mortar. Advances in Materials Science and Engineering, 14: 245473.
[3]. Kulekci, G., Yilmaz, A.O. and Çullu, M. (2021). Experimental investigation of the usability of construction waste as aggregate. Journal of Mining and Environment, 12 (1): 63-76.
[4]. Green, M.F., Bisby, L.A., Beaudoin, Y. and Labossière, P. (2000). Effect of freeze-thaw cycles on the bond durability between fibre reinforced polymer plate reinforcement and concrete. Canadian Journal of Civil Engineering, 27:949–959.
[5]. Külekçi, G., Erçikdi, B. and Aliyazicioğlu, S. (2016). Effect of waste brick as mineral admixture on the mechanical performance of cemented paste backfill. IOP Conference Series: Earth and Environmental Science, 44 (4): 042039.
[6]. Huseien, G.F., Mirza, J., Ismail, M., Ghoshal, S.K. and Ariffin, M.A.M. (2018). Effect of metakaolin replaced granulated blast furnace slag on fresh and early strength properties of geopolymer mortar. Ain Shams Engineering Journal, 9:1557–1566.
[7]. Al-Zahrani, M.M., Maslehuddin, M., Al-Dulaijan, S.U. and Ibrahim, M. (2003). Mechanical properties and durability characteristics of polymer- and cement-based repair materials. Cement and Concrete Composites, 25:527–537.
[9]. Davidovits, J. and France, S. (2020). Geopolymer Chemistry and Applications 5th edition.
[10]. Kaur, M., Singh, J. and Kaur, M. (2018). Synthesis of fly ash based geopolymer mortar considering different concentrations and combinations of alkaline activator solution. Ceramics International, 44:1534–1537.
[11]. Palomo, A., Grutzeck, M.W. and Blanco, M.T. (1999). Alkali-activated fly ashes: A cement for the future. Cement and Concrete Research, 29:1323–1329.
[12]. Panias, D., Giannopoulou, I.P. and Perraki, T. (2007). Effect of synthesis parameters on the mechanical properties of fly ash-based geopolymers. Colloids Surfaces A Physicochem. Eng. Asp, 301:246–254.
[13]. Schmücker, M. and MacKenzie, K.J.D. (2005). Micro-structure of sodium polysialate siloxo geopolymer. Ceramics International, 31:433–437.
[14]. Pacheco-Torgal, F., Castro-Gomes, J. and Jalali, S. (2008). Alkali-activated binders: A review. Part 2. About materials and binders manufacture. Construction and Building Materials, 22:1315–1322.
[15]. Ahmaruzzaman, M. (2010). A review on the utilization of fly ash. Prog. Energ. Combus, 36: 327–363
[16]. Yao, Z.T., Ji, X.S., Sarker, P.K., Tang, J.H., Ge, L.Q., Xia, M.S. and Xi, Y.Q. (2015). A comprehensive review on the applications of coal fly ash. Earth-Sc. Rev, 141:105–121.
[17]. Zhuang, X.Y., Chen, L., Komarneni, S., Zhou, C.H., Tong, D.S., Yang, H.M., Yu, W.H. and Wang, H. (2016). Fly Ash-based Geopolymer: Clean Production, Properties and Applications, Journal of Cleaner Production, doi: 10.1016/j.jclepro.2016.03.019.
[18]. Brindha, D. and Nagan, S. (2010). Utilization of copper slag as a partial replacement of fine aggregate in concrete. Int. J. Earth Sci. Eng, 3: 579–585.
[19]. Zuo, Z., Yu, Q., Wei, M., Xie, H., Duan, W., Wang, K. and Qin, Q. (2016). Thermogravimetric study of the reduction of copper slag by biomass: Reduction characteristics and kinetics. J. Therm. Anal. Calorim, 126: 481–491.
[20]. Lowinska-Kluge, A., Piszora, P., Darul, J., Kantel, T. and Gambal, P. (2011). Characterization of chemical and physical parameters of post copper slag. Cent. Eur. J. Phys, 9: 380–386.
[21]. Moura, W.A., Gonçalves, J.P. and Lima, M.B.L. (2007). Copper slag waste as a supplementary cementing material to concrete. J. Mater. Sci, 42: 2226–2230.
[22]. Topcu, I.B. (1995). The properties of rubberized concretes. Cement and Concrete Research, 25: 304-310.
[23]. Benazzouk, A., Mezreb, K., Doyen, G., Goullieux, A. and Queneudec, M. (2003). Effect of rubber aggregates on the physico-mechanical behaviour of cement–rubber composites-influence of the alveolar texture of rubber aggregates. Cement and Concrete Composites, 25: 711-720.
[24]. Zamanabadi, S.N., Zareei, S.A., Shoaei, P. and Ameri, F. (2019). Ambient-cured alkali-activated slag paste incorporating micro-silica as repair material: Effects of alkali activator solution on physical and mechanical properties. Construction and Building Materials, 229:116911.
[25]. Murali, K., Meena, T., Srikrishna, C.T. and Sai, P.P. (2018). An experimental study on factors influencing the compressive strength of geopolymer mortar. International Journal of Civil Engineering and Technology, 9:608-616.
[26]. Wang, S.D., Scrivener, K.L. and Pratt, P.L. (1994). Factors affecting the strength of alkali-activated slag. Cement and Concrete Research, 24:1033–1043.
[27]. Kirschner, A.V. and Harmuth, H. (2004). Investigation of geopolymer binders with respect to their application for building materials. Ceramics- Silikaty, 48:117–120.
[28]. Das, S.K. and Shrivastava, S. (2021). Influence of molarity and alkali mixture ratio on ambient temperature cured waste cement concrete based geopolymer mortar. Construction and Building Materials, 301:124380.
[29]. Mahendran, L. and Arunachelam, N. (2015). Study on utilization of copper slag as fine aggregate in geopolymer concrete. International Journal of Applied Engineering Research, 10 (53).
[30]. Turatsinze, A., Granju, J.L. and Bonnet, S. (2006). Positive synergy between steel-fibres and rubber aggregates: Effect on the resistance of cement-based mortars to shrinkage cracking. Cement and Concrete Research, 36:1692–1697.
[31]. Rajendran, M. and Akasi, M. (2020). Performance of Crumb Rubber and Nano Fly Ash Based Ferro-Geopolymer Panels under Impact Load. KSCE J. Civ. Eng, 24:1810–1820.
[32]. ASTM C1437-01. (2001). Standard Test Method for Flow of Hydraulic Cement Mortar. Annu. B. ASTM Stand, 1437:7–8.
[33]. ASTM C1910. (2008). Time of Setting of Hydraulic Cement by Vicat Needle. Annu. B. ASTM Stand, 191: 1–10.
[34]. ASTM C642-97. (2005). Density, Absorption, and Voids in Hardened Concrete Test. Annu. B. ASTM Stand, 642:1–3.
[35]. ASTM C109/C109M-02. (2020). Standard Test Method for Compressive Strength of Hydraulic Cement Mortars.  Annu. B. ASTM Stand, 109:9.
[36]. Elyamany, H.E., Abd Elmoaty, A.E.M. and Elshaboury, A.M. (2018). Setting time and 7-day strength of geopolymer mortar with various binders. Construction and Building Materials, 187:974–983.
[37]. Hanjitsuwan, S., Hunpratub, S., Thongbai, P., Maensiri, S., Sata, V. and Chindaprasirt, P. (2014). Effects of NaOH concentrations on physical and electrical properties of high calcium fly ash geopolymer paste. Cement and Concrete Composites, 45:9-14.
[38]. Jithendra, C. and Elavenil, S. (2020). Effects of Silica Fume on Workability and Compressive Strength Properties of Aluminosilicate Based Flowable Geopolymer Mortar under Ambient Curing. Silicon, 12:1965–1974.
[39]. Kubba, Z. et al (2018). Impact of curing temperatures and alkaline activators on compressive strength and porosity of ternary blended geopolymer mortars. Case Studies in Construction Materials, 9:00205.
[40]. Pangdaeng, S., Sata, V. and Chindaprasirt, P. (2018). Effect of sodium hydroxide concentration and sodium silicate to sodium hydroxide ratio on properties of calcined kaolin-white portlandcement geopolymer. International Journal of GEOMATE, 14:121–128.
[41]. Nath, P. and Sarker, P.K. (2014). Effect of GGBFS on setting, workability and early strength properties of fly ash geopolymer concrete cured in ambient condition. Construction and Building Materials journal, 66:163–171.
[42]. Wongsa, A., Sata, V., Nematollahi, B., Sanjayan, J. and Chindaprasirt, P. (2018). Mechanical and thermal properties of lightweight geopolymer mortar incorporating crumb rubber. Journal of Cleaner Production, 195:1069–1080.
[43]. Long, W.J., Li, H.D., Wei, J.J., Xing, F. and Han, N. (2018). Sustainable use of recycled crumb rubbers in eco-friendly alkali activated slag mortar: Dynamic mechanical properties. Journal of Cleaner Production, 204:1004–1015.
[44]. Bate, S.C.C. (1979). Guide for structural lightweight aggregate concrete: report of ACI committee 213. International Journal of Cement Composites and Lightweight Concrete, 1:5–6.
[45]. Guo, S., Dai, Q., Si, R., Sun, X. and Lu, C. (2017). Evaluation of properties and performance of rubber-modified concrete for recycling of waste scrap tire. Journal of Cleaner Production, 148:681–689.
[46]. Mohammadi, I., Khabbaz, H. and Vessalas, K. (2016). Enhancing mechanical performance of rubberised concrete pavements with sodium hydroxide treatment. Materials and Structures, 49:813–827.
[47]. Thomas, B.S. and Gupta, R.C. (2016). A comprehensive review on the applications of waste tire rubber in cement concrete. Renewable and Sustainable Energy Reviews, 54:1323–1333.
[48]. Muñoz-Sánchez, B., Arévalo-Caballero, M.J. and Pacheco-Menor, M.C. (2017). Influence of acetic acid and calcium hydroxide treatments of rubber waste on the properties of rubberized mortars. Materials and Structures, 50:75.
[49]. Aly, A.M., El-Feky, M.S., Kohail, M. and Nasr, E.S.A.R. (2019). Performance of geopolymer concrete containing recycled rubber. Construction and Building Materials, 207:136–144.
[50]. Mithun, B.M. and Narasimhan, M.C. (2016). Performance of alkali activated slag concrete mixes incorporating copper slag as fine aggregate. Journal of Cleaner Production, 112: 837–844.
[51]. Al-Jabri, K.S., Al-Saidy, A.H. and Taha, R. (2011). Effect of copper slag as a fine aggregate on the properties of cement mortars and concrete. Construction and Building Materials, 25: 933–938.
[52]. Mermerdaş, K., Algın, Z. and Ekmen (2020). Experimental assessment and optimization of mix parameters of fly ash-based lightweight geopolymer mortar with respect to shrinkage and strength. Journal of Building Engineering, 31:101351.
[53]. Kamhangrittirong, P., Suwanvitaya, P., Witayakul, W., Suwanvitaya, P. and Chindaprasirt, P. (2013). Factors influence on shrinkage of high calcium fly ash geopolymer paste. Advanced Materials Research, 610–613: 2275–2281.
[54]. Deb, P.S., Nath, P. and Sarker, P.K. (2014). The effects of ground granulated blast-furnace slag blending with fly ash and activator content on the workability and strength properties of geopolymer concrete cured at ambient temperature. Materials and Design, 62:32–39.
[55]. Villa, C., Pecina, E.T., Torres, R. and Gómez, L. (2007). Geopolymer synthesis using alkaline activation of natural zeolite. Construction and Building Materials, 24:2084–2090.
[56]. Kong, D.L.Y., Sanjayan, J.G. and Crentsil, K.S. (2007). Comparative performance of geopolymers made with metakaolin and fly ash after exposure to elevated temperatures. Cement and Concrete Research, 37:1583–1589.
[57]. Bravo, M. and Brito, J.D. (2012). Concrete made with used tyre aggregate: Durability-related performance. Journal of Cleaner Production, 25:42–50.
[58]. Copetti, C.M., Borges, P.M., Squiavon, J.Z., da Silva, S.R. and Andrade, J.J.O. (2020). Evaluation of tire rubber surface pre-treatment and silica fume on physical-mechanical behavior and microstructural properties of concrete. Journal of Cleaner Production, 256: 120670.
[59]. Adamu, M., Mohammed, B.S. and Liew, M.S. (2018). Mechanical properties and performance of high volume fly ash roller compacted concrete containing crumb rubber and nano silica. Construction and Building Materials, 171:521–538.
[60]. Ameri, F., Shoaei, P., Musaeei, H.R., Zareei, S.A. and Cheah, C.B. (2020). Partial replacement of copper slag with treated crumb rubber aggregates in alkali-activated slag mortar. Construction and Building Materials, 256:119468.
[61]. Saloni, Parveen., Pham, T.M., Lim, Y.Y. and Malekzadeh, M. (2021). Effect of pre-treatment methods of crumb rubber on strength, permeability and acid attack resistance of rubberised geopolymer concrete. Journal of Building Engineering, 41:1–12.