Advances in concrete construction

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Effect of alkaline activators on the fresh properties and strength of silico-manganese fume-slag activated mortar

  • Nasir, Muhammad (Department of Civil and Construction Engineering, College of Engineering, Imam Abdulrahman Bin Faisal University) ;
  • Johari, Megat Azmi Megat (School of Civil Engineering, Engineering Campus, Universiti Sains Malaysia) ;
  • Yusuf, Moruf Olalekan (Department of Civil Engineering, University of Hafr Al Batin) ;
  • Maslehuddin, Mohammed (Center for Engineering Research, Research Institute, King Fahd University of Petroleum and Minerals) ;
  • Al-Harthi, Mamdouh A. (Department of Chemical Engineering, King Fahd University of Petroleum and Minerals)
  • Received : 2019.07.09
  • Accepted : 2020.10.13
  • Published : 2020.11.25
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Abstract

This study investigated the effect of alkaline activators - NaOHaq (NH) (NH: 0-16 M) and Na2SiO3aq (NS) (NS/NH: 0-3.5) in the synthesis of silico-manganese fume (SMF) and ground blast furnace slag (BFS) blended alkali-activated mortar (AASB). The use of individual activator was ineffective in producing AASB of sufficient fresh and hardened properties, compared to the synergy of both activators. This may be attributed to incomplete dissolution and condensation of oligomers required for gelation of the binder. An inverse relationship was noted among the fresh properties and the NH concentration or NS/NH ratio. This was influenced by the dissolution and condensation of silicate monomers under polymerization process. The maximum 28-day strength of ~45 MPa, setting time of 60 min and flow of 182 mm was obtained with the use of combined activators (10M-NH and NS/NH=2.5). The combined activators at NS/10M-NH=2.5 constituted SiO2/Na2O, H2O/Na2O and H2O/SiO2 molar ratio of 1.61, 17.33 and 10.77, respectively. This facilitated the formation of C-S-H, C/K-A-S-H and C-Mn-S-H in the framework together with an increase in the crystallinity due to more silicate re-organization within the aluminosilicate chain. On comparison of the high concentrated with mild alkali synthesized product, it revealed that the concentration of OH- and Si monomers together with alkali metals influenced the dissolution of precursors and embedment of the constituent elements in the polymeric matrix. These factors eventually contributed to the microstructural densification of the mortar prepared with NS/10M-NH=2.5 thereby enhancing the compressive strength.

Keywords

Acknowledgement

The support of the School of Civil Engineering at Universiti Sains Malaysia, King Fahd University of Petroleum and Minerals and Imam Abdulrahman Bin Faisal University is gratefully acknowledged.

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