Granulated blast furnace slag as a supplement enhancing fire resistance of Portland cement mortar


  • Thi Duy Hanh Le Department of Chemical Engineering Technology, HCMC University of Technology and Education, No.1 Vo Van Ngan, Thu Duc City, Ho Chi Minh City, Viet Nam
  • Le Duy Pham Van Cat Construction Co, LTD, 84A/36 Tran Huu Trang, Phu Nhuan District, Ho Chi Minh City, Viet Nam
  • Van Vinh Pham Department of Chemical Engineering Technology, HCMC University of Technology and Education, No.1 Vo Van Ngan, Thu Duc City, Ho Chi Minh City, Viet Nam



Granulated blast furnace slag, compressive strength, high temperature resistance


Using steel slag in the cement industry has been considered a green recycling solution to the solid waste problem. Granulated blast furnace slag (GBFS), in fact, is used as an additive to  counteract  the  sulfate  attack  of  Portland  cement;  however,  its  ability  to  undergo  fire  or  heat exposure  has  not  been  highlighted  yet.  Therefore,  this  study  focuses  on  compressive  strength behaviour  at  high  temperature  along  with  workability  of  cement  paste  of  cement  containing GBFS. Here, a set of blended mixture prepared with OPC was replaced by GBFS at 10, 20, 30, 40  wt.%.Setting  time  of  pure  OPC  and  blended  OPC  and  GBFS  was  carried  out  to  evaluate workability of all mixtures. After 28 days of curing, compressive strength of samples exposed  to heat  at  200,  400  and  600 C  was  measured.  Along  with  that,  the  mass  loss  of  the  sample  to predict  thermal  resistance  was  analyzed  by  thermogravimetric  analysis  (TGA);  moreover, microstructure of hardened samples in terms of mineral composition, distribution was analyzed by X-ray diffraction (XRD) and Scanning electron microscopy (SEM). Results of the conducted study  showed  that GBFS  addition  into OPC  could  enhance  fire  resistance  through  the  slight increase  in  compressive  strength  compared  to  the  OPC one  at  600C  and  the  mass  loss; moreover,  the  blended  cement  containing  different  amount  of  GBFS  maintain  workability  of cement paste.


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How to Cite

T. D. H. Le, L. D. Pham, and V. V. . Pham, “Granulated blast furnace slag as a supplement enhancing fire resistance of Portland cement mortar”, Vietnam J. Sci. Technol., vol. 59, no. 6A, pp. 69–78, Mar. 2022.



International Symposium on Materials Science and Engineering - ISMSE