The Effect of Sodium Tripolyphosphate on Sodium Silicate-Cement Grout


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Sodium silicate has been widely used as starting materials of chemical grout owing to its feasibility and short setting time with reasonable strength. Elution of sodium has been pointed out as the main reason of weak durability of homogel prepared with sodium silicate-cement grout. There are well known series of additives for controlling its setting time, fluidity, and compressive strength. We studied the structural change on the sodium silicate with additive of sodium tripolyphosphate (STPP) by 29Si nuclear magnetic resonance spectrum and viscosity. The homogel was prepared by mixing cement/water suspension and diluted sodium silicate/STPP mixtures, and aged in the water. The development of compressive strength and its structural change were observed using a universal test machine, X-ray diffraction, and scanning electron microscope. The additive changed the distribution of Si and rheological property of liquid sodium silicate, which caused more uniform distribution of Ca and Si in the homogel to lead to high initial strength and durability.



Materials Science Forum (Volumes 486-487)

Edited by:

Hyung Sun Kim, Sang-Yeop Park, Bo Young Hur and Soo Wohn Lee




H. M. Lim et al., "The Effect of Sodium Tripolyphosphate on Sodium Silicate-Cement Grout ", Materials Science Forum, Vols. 486-487, pp. 391-394, 2005

Online since:

June 2005




[1] R.H. Karol: Chemical Grouting (Marcel Dekker, Inc, New York 1990).

[2] M.S.J. Gani: Cement and Concrete (Chapman & Hall, UK 1997).

[3] A. Papo, L. Piani, R. Riccerri, Colloids and Surfaces A: Physicochemical and Engineering Aspects 201 (2002), p.219. : STPP.

[4] R. Lin, J. -Y. Zhang, P. Zhang: J. Crystal Growth 245 (2002), P. 309.

[5] J.S. Falcon, Jr: Encyclopedia of Chemical Technology, Vol. 20 (Wiley-Interscience, New York 1982) Table 2. Elution of homogels of 4 day ageing after 1 day exposure to water Sample Si Na Ca WG100 312 651 8. 5 SC100 16. 5 625 8. 8 WG60 6. 7 434 0. 7 SC60 5. 3 672 0. 8.