ABSTRACT

This paper analyzes the ability of magnesium oxide-based additives to stabilise a low bearing gypsum marly soil, in order to reach subgrade requirements. This soil was not adequate for stabilisation with lime or cement because of its high sulphate content. Binders considered in this investigation were composed of three reactive Mg products and by products, both with and without ground granulated blast furnace slags (GGBS). They were compared to two cements and an aerial lime as soil stabilisers in a laboratory investigation and a field trial. Laboratory tests showed that Mg products with GGBS reached strength results close and at times even better than those of cement. One of the Mg products was the only additive able to reduce the natural soil swelling. Leaching tests demonstrated the ability of the Mg products to reduce the soil leaching of substances like calcium, magnesium, sulphate and chloride. In field trials two of the Mg products combined with GGBS met the bearing capacity requirements for subgrades, in accordance with the Spanish standard.

摘要

本文分析了氧化镁基添加剂稳定低承载石膏泥土的能力，以达到路基要求。由于硫酸盐含量高，这种土壤不足以用石灰或水泥进行稳定。本次调查中考虑的粘合剂由三种活性镁产品和副产品组成，有和没有磨碎的粒状高炉矿渣 (GGBS)。在实验室调查和现场试验中，将它们与作为土壤稳定剂的两种水泥和一种空中石灰进行了比较。实验室测试表明，含 GGBS 的镁产品达到了接近甚至有时甚至优于水泥的强度结果。其中一种镁产品是唯一能够减少天然土壤膨胀的添加剂。浸出试验证明了镁产品能够减少钙、镁、硫酸盐和氯化物等物质的土壤浸出。在现场试验中，两种与 GGBS 相结合的 Mg 产品符合西班牙标准的路基承载能力要求。