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Effect of friedel's salt on strength enhancement of stabilized chloride saline soil

Journal of Central south University 2017年第4期24卷 937-946页

作者：程寅李战国黄新白晓红 school of Transportation science and Engineering Beihang University College of Architecture and Civil Engineering Taiyuan University of Technology

In the field of soil stabilization, only calcium silicate hydrate(CsH) and ettringite(AFt) as hydration products have been reported to directly contribute to the strength enhancement of the soil. A chloride dredger fill, an artificial chloride saline soil, and a non-saline soil were stabilized by Portland cement(PC) and PC with Ca(OH)_2(CH) with different contents. A series of unconfined compressive strength(UCs) tests of stabilized soil specimen after curing for 7 d and 28 d were carried out, and the hydration products and microstructure of the specimens were observed by X-ray diffractometry(XRD), scanning electronic microscopy(sEM), and energy-dispersive X-ray analysis(EDXA). The results showed that the strengths of PC+CH-stabilized chloride saline soils were much higher than those of PC-stabilized soils. A new hydration product of calcium aluminate chloride hydrate, also known as friedel's salt, appeared in the PC+CH-stabilized chloride saline soils. The solid-phase volume of friedel's salt expanded during the formation of the hydrate; this volume filled the pores in the stabilized soil. This pore-filling effect was the most important contribution to the significantly enhanced strength of the PC+CH-stabilized chloride saline soils. On the basis of this understanding, a new optimized stabilizer was designed according to the concept that the chloride in saline soil could be utilized as a component of the stabilizer. The strength of the chloride saline soils stabilized by the optimized stabilizer was even further increased compared with that of the PC+CH-stabilized soils.

关键词： chloride saline soil stabilized soil friedel’s salt strength enhancement effect

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