西湖疏浚淤泥的固化试验

Stabilization of dredged silt from West Lake

采用工业废料、水泥及添加剂对西湖疏浚淤泥进行固化.结果表明,淤泥固化土的强度能够达到公路基层填料的要求,但是淤泥的含水量对固化效果的影响很大,若将含水量降至100%以下,淤泥固化土的强度随固化材料掺入比和龄期的提高均有较大的增长,可获得理想的固化效果;钢渣和粉煤灰两种工业废料中,钢渣对淤泥固化土强度的提高幅度显著高于粉煤灰,当钢渣掺入比大于30%时,淤泥固化土Ⅰ和Ⅱ分别可作为公路基层和底基层的填料,但掺粉煤灰的淤泥固化土不能满足公路基层填料的强度要求;掺入少量的QL-1添加剂能显著提高淤泥固化土的强度,从成本和效果综合考虑,QL-1添加剂的掺入比不宜超过1.5‰;水泥掺入比大于10%才能有效地固化西湖淤泥;经估算,采用淤泥固化土作为公路基层填料与级配粒料造价相当,但其环保和社会效益却无法比拟.

Industrial residues, cement and additive were used to stabilize dredged silt from West Lake. Results showed that the stabilized-silt can be used as roadbase filling. Water content is one of the key parameters for the silt stabilization. When water content is below 100%, the strength of the stabilized-sih improves dramatically with the increase of stabilizer mixing ratio and age. Steel slag is much more effective than flying ash in improving the strength of stabilized-silt. When the steel slag mixing ratio is above 30%, stabilized-sih Ⅰ can be used as roadbase filling, stabilized-sih Ⅱ can be used as subbase filling, yet the stabilized-silt with flying ash can＇t. A small quantity of QL - 1 additive can dramatically improve the strength of stabilized-silts, when the economic mixing ratio is less than 1.5‰. The cement mixing ratio should be above 10% to stabilize the dredged silts. It is estimated that when using in roadbase construction, stabilized-sih costs almost the same as graded aggregate, yet the former has much more environmental and social values.