Influence of a Retarding Admixture on the Behavior of Mortars Made from Different Types of Cement

  • Authors

    • Tumadhir Merawi Borhan
    • Munaf A. Al-Ramahee
    • Noor Al-Hassnawi
    • Zaid Ali AlZaidi
    2018-11-28
    https://doi.org/10.14419/ijet.v7i4.20.26129
  • Cement type, Compressive strength, length change, Retarding admixture, Setting time.
  • The effect of retarding admixture on the fresh and hardened behaviour of different types of cement mortars and pastes when using a retarding admixture was investigated in this study. The types of cement used are; White cement (WhC), Ordinary Portland cement (OPC) and Sulphate Resistant Portland cement (SRC). Different cement mortar and paste mixes were cast, for this purpose, with and without the admixture. Initial and final setting times, compressive strength, length change, absorption and density for these mixes were examined at the curing ages of 3,7,28,45 days. The results showed that the addition of retarding admixture delayed the setting time significantly of WhC paste. The retarding admixture has a positive effect on the compressive strength of the mortar specimens for all types of cement used. regarding the length change test, the admixture was found to reduce the initial expansion for all types of cement at all ages. The results also showed an increase in the density and decrease in water absorption, especially at the later ages for all types of cement.  Among all cement types used, WhC was noticeably the most affected type by using the retarding admixture compared to other types of cement used.

     

     

  • References

    1. [1] Farzam, H., G. Bollin, R. Howe, J. Marin, B. Erlin, and H. Isabelle, Cement and Concrete Terminology. Vol. 116. 2005: ACI Committee.

      [2] Neville, A.M., Properties of Concrete, 4th. London Pearson Education Limited, 2011. 443(846): p. 444.

      [3] Alsadey, S. Effects of Super Plasticizing and Retarding Admixtures on Properties of Concrete. in International Conference on Innovations in Engineering and Technology. 2013.

      [4] ErdoÄŸan, T., Admixtures for Concrete Middle East Technical University. 1997, ISBN 975-479-113-6-188 s, Ankara.

      [5] AIshamsi, A., K. Alhosani, and K. Yousri, Hydrophobic materials, superplasticizer and microsilica effects on the setting of cement paste at various temperatures. Magazine of concrete research, 1997. 49(179): p. 111-115.

      [6] Khan, B. and M. Ullah, Effect of a Retarding Admixture on the Setting Time. of Cement Pastes in Hot Weather. Engineering Sciences, 2004. 15(1).

      [7] Abalaka, A.E., Effects of sugar on the physical properties of ordinary Portland cement paste and concrete. AU JT, 2011. 14(3): p. 225-228.

      [8] Khan, B. and B. Baradan, The effect of sugar on setting-time of various types of cement. Quarterly science vision, 2002. 8(1): p. 71-78.

      [9] Ozturk, A.U. and B. Baradan, Effects of admixture type and dosage on microstructural and mechanical properties of cement mortars. KSCE Journal of Civil Engineering, 2011. 15(7): p. 1237.

      [10] Alshamsi, A., A. Sabouni, and A. Bushlaibi, Influence of set-retarding superplasticisers and microsilica on setting times of pastes at various temperatures. Cement and Concrete research, 1993. 23(3): p. 592-598.

      [11] ASTM, C150/C150M-16e1: Standard Specification for Portland Cement. ASTM International, West Conshohocken, PA, USA, 2016.

      [12] ASTM, C191 Standard test methods for the time of setting of hydraulic cement by Vicat needle. 2008.

      [13] ASTM, C187-98,". Standard Test Method for Normal Consistency of Hydraulic Cement", Annual Book of ASTM Standards, 2005. 4.

      [14] BS EN 12390-3:2002. Testing hardened concrete Part 3: the compressive strength

      [15] of test specimens. British standard; 2002.

      [16] ASTM, C157 Standard test method for length change of hardened hydraulic-cement mortar and concrete. 2008.

      [17] ASTM, C642, Standard test method for density, absorption, and voids in the hardened concrete. Annual book of ASTM standards, 2006. 4: p. 02.

      [18] Mardani-Aghabaglou, A., A.E. Son, B. Felekoglu, and K. Ramyar, Effect of cement fineness on properties of cementitious materials containing high range water reducing admixture. Journal of Green Building, 2017. 12(1): p. 142-167.

      [19] Falah, M.W. and R.J. Ghayyib, Evaluating The Effects of Using Superplasticizer RHEOBUILD® 600 on The Workability and Compressive Strength of Normal Concrete. Journal of University of Babylon, 2018. 26(5): p. 95-104.

      [20] Gowda, H., Effects of Retarding Admixtures on Plastic Shrinkage of Portland Cement Paste: Interim Report. 1973.

  • Downloads

  • How to Cite

    Merawi Borhan, T., A. Al-Ramahee, M., Al-Hassnawi, N., & Ali AlZaidi, Z. (2018). Influence of a Retarding Admixture on the Behavior of Mortars Made from Different Types of Cement. International Journal of Engineering & Technology, 7(4.20), 334-337. https://doi.org/10.14419/ijet.v7i4.20.26129