潮湿环境中稻草的防腐效果及极限拉伸性能

滨海盐渍土存在盐胀、溶陷和吸湿软化等问题，需对其进行处理。设想使用高分子材料SH胶防腐处理稻草，以防腐后的稻草加筋滨海盐渍土。为评价浸胶稻草的防腐效果及其力学性能，测试了天然和浸泡SH胶稻草的吸水率，及天然、浸水、浸胶及浸胶后再浸海水稻草的极限拉力和极限延伸率。结果表明：（1）浸胶稻草与天然稻草相比，吸水率最多可降低50%，证实防腐效果较好;（2）浸胶后，稻草的极限延伸率和极限拉力最大提高了26%和23%;（3）同是浸泡在海水中，浸胶后稻草较天然稻草，其极限延伸率和极限拉力的最大增长率为12%和11%;（4）浸胶稻草的SEM照片观察及能谱分析表明，SH胶包裹了纤维并进入到稻草的孔隙中，增强了纤维间的联结，提高了稻草的极限抗拉性能。SH胶防腐后的稻草作为加筋材料是可行的。

Anti-Decayed Ability and Maximum Tensility of Rice Straw in Humid Environment

Saline soil in inshore has some problems which were resulted from crystallizing and dissolving in salt and water absorption of soil. It must be treated in the stage of engineering construction. It has been suggested that rice straw can be anti-decayed with SH agent and used for reinforcing saline soil. Some tests were carried out in order to study the water content, maximum tension and maximum elongation of rice straw in condition of natural, soaked in water, soaked in SH agent and soaked in water after SH agent respectively. The results indicate that: (1) The water content of rice straw soaked in SH agent is obviously less than of natural rice straw, the biggest decreasing rate is 50%. (2) The maximum elongation and maximum tension of rice straw soaked in SH agent is more than those of natural rice straw, with the biggest increasing rate of 26% and 23%. (3) The maximum elongation and maximum tension of rice straw soaked in seawater after in SH agent is more than those soaked in seawater, with the biggest increasing rate of 12% and 11%. (4) Results of SEM and EDS test show that SH agent infiltrates into voids of rice straw and enhances the connection of fiber. In future, SH agent can be used to slow down the decay of rice straw and reinforcing saline soil with rice straw is feasible.