陕南地区农村传统民居生土墙体材料改性研究

Modification study on rammed earth material for southern Shaanxi rural traditional houses

陕南地区农村存在着大量传统生土民居建筑,但传统的生土材料具有强度较低、耐水性差和体积稳定性欠佳等缺点,从而限制了生土材料的推广与应用。以陕南地区的素土为原料,稻草、生石灰、熟石灰和淀粉等为改性剂,按照不同比例分别制备改性土样(即改性生土材料试样),并对其剪切强度、黏聚力、内摩擦角和耐水性等进行了对比试验。结果表明:3%稻草改性生土和7%淀粉改性生土的剪切强度明显高于素土;以7%淀粉胶粘剂制成的改性生土,其耐水性优于3%稻草改性生土和素土;该研究结果可为陕南地区农村传统民居生土墙体材料的改性提供有效的参考依据。

There are a large number of traditional houses building made from rammed earth material in southern Shaanxi rural area, but the traditional raw soil material has some fatal flaws （such as poor compressive strength, lower water resistance and volume stability） , which popularization and application were restricted. With southern Shaanxi soil as raw material, straw, quicklime, hydrated lime and starch as modifiers, so the modified soil samples （namely modified rammed earth material samples） were prepared respectively by different modifier proportions, and some experiments （such as shear strength, cohesion, internal friction angle and water resistance experiments） were contrasted. The results showed that the shear strength of 3% straw modified raw soil or 7% starch modified raw soil was obviously higher than that of soil. The water resistance of 7% starch modified raw soil was better than that of soil or 3% straw modified raw soil. The research results can provide effective reference for modified rammed earth materials in southern Shaanxi rural traditional houses