稻草灰对滨海盐土改良的试验研究

为改善滨海盐土质量,以稻草灰作为改良剂,分别研究了灰土体积比为0%、10%、20%和30%滨海盐土在水稳定性团聚体含量、稠度指标、最大干密度和最优含水率等指标的变化规律。结果表明:稻草灰可以提高滨海盐土中粒径在5.0~10.0 mm和2.0~5.0 mm水稳定性大团聚体的含量,减小粒径小于0.25 mm微团聚体的含量;稻草灰可以提高滨海盐土的塑限、液限和塑性指数,但对塑限、液限的影响显著,对塑性指数的影响相对较小;稻草灰可以显著降低滨海盐土的最大干密度,提高最优含水率。由此说明,稻草灰可以提高滨海盐土的保水性能与疏松度,把稻草灰运用于滨海盐土的改良,可取得工业废弃物资源化与土地合理改良的双重生态效益。

Experiment on coastal saline soil improved with rice straw ash

In order to improve the quality of coastal saline soil, the paper took rice straw ash as amend- ment and studied the variation rule of these indicators such as the content of water - table aggregates, consistency index and eompactibility in coastal saline soil at the volume ratios of of 0%, 10% ,20% and 30% of ash and soil. The results showed that rice straw ash can increase the content of water - stable aggregates with particle size between 5.0ram to 10.0ram and 2. Omm to 5. Omm, and decrease the content of microaggregates with particle size less than 0.25ram; rice straw ash can significantly increase liquid limit , plastic limits and plastic index, it has prominent influence on plastic limit , liquid limit but has less influence on plastic index; rice straw ash can decrease maximum dry bulk density and increase optimum moisture content. The results clearly indicated that application of rice straw ash can improve the property of water retention and porosity of coastal saline soil. The use of rice straw ash can achieve bi - ecological benefit of resource recovery of industrial wastes and rational improvement of soil.