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首页> 外文期刊>Cold regions science and technology >Effect of freeze-thaw cycles on the strength and physical properties of cement-stabilised soil containing recycled bassanite and coal ash
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Effect of freeze-thaw cycles on the strength and physical properties of cement-stabilised soil containing recycled bassanite and coal ash

机译：冻融循环对含再生重钙铝石和煤灰的水泥稳定土强度和物理性能的影响

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摘要

Earth materials deteriorate physically under freeze-thaw cycling. It is thus important to determine how freeze-thaw cycling affects their properties of new man-made materials in areas experiencing seasonal frost. The effect of variable freeze-thaw cycling on the durability of cement-stabilised soils containing bassanite and coal ash was quantified to promote the use of bassanite in earthwork project in seasonal frost areas. For mis purpose, very soft clay was stabilised with 5% cement content by weight of dry soil, and bassanite and coal ash were mixed with it in differing proportions. These stabilised soil samples were subjected to differing numbers of freeze-thaw cycles (up to five cycles), after curing for 28 days. Unconfined compressive strength and several physical properties were investigated after freeze-thaw cycling. The results show that the addition of both bassanite and coal ash improves the strength and durability of stabilised soils significantly, whereas the addition of coal ash alone has a negative effect on strength improvement. Unconfined compressive strength increases with increased bassanite and coal ash contents. With respect to freezing and thawing durability, the first or second cycles of freeze-thaw action markedly decrease the unconfined compressive strength of both treated and untreated cement-stabilised soils, but further cycles have little additional influence. The use of both additives improves durability, and retains 65-85% strength compared to corresponding non-frozen stabilised soils; if either additive is used, the strength is 55-65%; and if no additives are used, about 50%. The effects of freeze-thaw cycling on water content and dry density are negligible compared to those of additive contents. Volume after freezing increased slightly with increase in the number of freeze-thaw cycles, although volume after thawing fell slightly and reached minimum at the first thawing process.
机译：在冻融循环下，地球物质会物理退化。因此，重要的是确定在经历季节性霜冻的地区，冻融循环如何影响新型人造材料的性能。量化了可变冻融循环对含重钙铝石和煤灰的水泥稳定土壤的耐久性的影响，以促进重钙铝石在季节性霜冻地区的土方工程中的使用。出于错误的目的，用水泥含量为5％（按干土重量计）的水泥稳定了非常软的粘土，然后将不同比例的重钙铝石和煤灰混合。固化28天后，对这些稳定的土壤样品进行不同数量的冻融循环（最多5个循环）。冻融循环后研究无限制的抗压强度和一些物理性质。结果表明，无论是添加重钙铝石还是粉煤灰，均可显着提高稳定土的强度和耐久性，而单独添加粉煤灰则对强度提高具有负面影响。无限制的抗压强度随着重钙铝石和煤灰含量的增加而增加。关于冻结和融化的耐久性，第一或第二周期的冻融作用显着降低了经处理和未经处理的水泥稳定土的无侧限抗压强度，但进一步的循环几乎没有其他影响。与相应的非冷冻稳定土壤相比，两种添加剂的使用均提高了耐久性，并保持了65-85％的强度。如果使用任何一种添加剂，则强度为55-65％；如果不使用任何添加剂，则约为50％。与添加剂含量相比，冻融循环对水含量和干密度的影响可以忽略不计。冷冻后的体积随冷冻-解冻循环次数的增加而略有增加，尽管解冻后的体积略有下降并在第一个解冻过程中达到最小。

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