Effect of aggressive pH media on peat treated by cement and sodium silicate grout

Abstract

The effects of aggressive peat nature (pH) on the strength of peat treated by cement and cement-sodium silicate grout were investigated by evaluating the changes in unconfined compressive strength, moisture content, and scanning electron microscopy (SEM) of samples with time in different pH media. The results indicate that peats treated by cement-silicate have higher strength than peats treated by cement, due to an increase in pH value of the media. Furthermore, cement and cement-silicate are highly effective in reducing the moisture content and void ratio of the treated peats. The microstructures of treated peats support the laboratory test results.

Keywords

peat / aggressive pH media / cementation / sodium silicate / grout / microstructure

References

[1] KAZEMIAN S, HUAT B B K, PRASAD A, BARGHCHI M. A state of art review of peat from general perspective [J]. International Journal of the Physical Sciences, 2011. (in Press).

[2] von PostL.. Geological survey of Sweden peat inventory and some of its hitherto missing data [J]. Tidskr, 1922, 1: 1-27

[3] American Society for Testing. Materials Annual: Annual book of ASTM standards [M]. Philadelphia, PA, USA, 1992: 04.08.

[4] EDIL T B, WANG X. Shear strength and K₀ of peats and organic soils [M]. Geotechnics of High Water Content Materials, ASTM STP 1374, West Conshohocken, Pa., 2000: 209–225.

[5] CharmanD.Peatlands and environmental change [M], 2000, Chichester, UK, John Wiley & Sons Ltd: 190-200

[6] RossS. M.. Organic matter in tropical soils: Current conditions, concerns and prospects for conservation [J]. Progress in Physical Geography, 1993, 17(3): 265-305

[7] ANDRIESSE J P. Nature and management of tropical peat soils [M]// FAO Soils Bulletin 59. Rome, Italy, 1988: 1–165.

[8] AndersonC. D., SudolE. D., El-aasseM. S.. Elucidation of the miniemulsion stabilization mechanism and polymerization kinetics [J]. Journal of Applied Polymer Science, 2003, 90(14): 3987-3993

[9] EUROSOILSTAB. Development of design and construction methods to stabilize soft organic soils: Design guide soft soil stabilization [S]. CT97-0351. Industrial & Materials Technologies Programme (Brite-EuRam III), European Commission, 2002: 15–60.

[10] HebibS., FarrellE. R.. Some experiences on the stabilization of Irish peats [J]. Can Geotech J, 2003, 40(1): 107-120

[11] HOLM G. Deep stabilization by admixtures [C]// Proc 13th Int Conf on Soil Mech and Foundation Eng. New Delhi, India, 1994: 161–162.

[12] JelisicN., LeppanenM.Mass stabilization of organic soils and soft clay [M], 2003, Reston, VA, USA, Geotechnical Special Publication: 552-561

[13] AxelssonK., JohanssonS., AnderssonR.Stabilization of organic soil by cement- and puzzolanic reactions-feasibility study [R], 2000, Linköping, Sweden, Swedish Deep Stabilization Research Center

[14] KarolR. H.BakerW. H.. Chemical grouts and their properties [M]. Grouting in Geotechnical Engineering, 1982, USA, American Society of Civil Engineering: 359-377

[15] KarolR. H.Chemical grouting and soil stabilization [M], 2003, New Jersey, USA, Marcel Dekker Inc: 15-65

[16] CORPORATION P Q. Soluble silicate in geotechnical grouting applications [M]. 2003, Bulletin 52–53, U.S.A.

[17] SHROFF A V, SHAH D L. Grouting technology in tunneling and dam construction [M]. Balkema, Rotterdam, Netherlands, 1999: 10–59.

[18] US ARMY CORPS OF ENGINEERS. Chemical grouting [R]. USACE Manual No. 1110-1-3500, Washington D C, USA, 1995.

[19] CIRIA.Grouting for grouting engineering [M], 2000, London, UK, CRIRIA Press: 17-22

[20] British Standard Institution. Methods of test for soils for civil engineering purposes [S]. London, UK, BS 1377-1990: Part 2, 3, 6 and 7, 1990.

[21] GillmanG. P., SumpterE. A.. Modification to compulsive exchange method for measuring exchange characteristics of soils [J]. Aust J Soil Res, 1986, 24: 61-66

[22] BrunauerS., EmmettP. H., TellerE.. Adsorption of gases in multimolecular layers [J]. J of American Chemical Society, 1938, 60: 309-319

[23] StevensonF. J.Humus chemistry, genesis, composition, reactions [M], 1994, John Willy & Sons Inc., US: 429-459

[24] WangH.-d., QiuG.-z., HuangS.-sheng.. Cement industry control system based on multi agent [J]. J Cent South Univ Technol, 2004, 11(1): 41-45

[25] TremblayH., DuchesneJ., LocatJ., LeroueilS.. Influence of the nature of organic compounds on fine soil stabilization with cement [J]. Can Geotech J, 2002, 39: 535-546

[26] SantamarinaJ. C., KleinK. A., WangY. H., PrenckeE.. Specific surface area: Determination and relevance [J]. Can Geotech J, 2002, 39: 233-241

[27] BrykovA. S., DanilovB. V., LarichkovA. V.. Specific features of Portland cement hydration in the presence of sodium hydrosilicates [J]. Russian Journal of Applied Chemistry, 2006, 79(4): 521-524

[28] ChenH., WangQ.. The behavior of organic matter in the process of soft soil stabilization using cement [J]. Bull Eng Geol Environ, 2006, 65: 445-448

[29] GaoY.-l., ZhouS.-qiong.. Influence of ultra-fine fly ash on hydration shrinkage of cement paste [J]. J Cent South Univ Technol, 2007, 12(5): 596-600

[30] KAZEMIAN S, HUAT B B K, BOLOURI BAZAZ J, ABDUL AZIZ F N, MOHAMMED T A. Influence of the peat characteristics on cementation and pozzolanic reactions in dry mixing method [J]. The Arabian Journal for Science and Engineering, 2011. (in Press)

[31] KazemianS., HuatB. B. K., PrasadA., BarghchiM.. Study of peat media on stabilization of peat by traditional binders [J]. International Journal of Physical Sciences, 2011, 6(3): 476-481