摘要
中国滨海有大面积含盐量较高的吹填淤泥需固化处理。现采用自制固化剂A与普通硅酸盐水泥对含盐量为8%的天津滨海新区吹填淤泥TT进行固化试验,当固化剂掺入比为10%和15%时,采用自制固化剂A的固化土强度分别比用普硅水泥的固化土强度提高了2.4倍和1.7倍。采取SEM、XRD和EDXA等试验对各固化土进行对比分析,结果表明:固化剂A固化TT固化土时,除产生了与水泥水化物相同的水化产物外,还与TT中的NaCl共同作用生成水化产物Ca4Al2Cl2O6?10H2O;Ca4Al2Cl2O6?10H2O体积膨胀填充土中空隙,是吹填淤泥固化土的强度大幅提高的原因之一。
There is a large area of high saline dredger fill in China＇s coastal areas that are needed to be stabilized.Self-made stabilizer A and portland cement are adopted to stabilize the dredger fill collected from the Tianjin Binhai New Area.The salinity of the dredger fill is 8%.Under the mixing ratio of 10% and 15%,the strengths of the stabilized soil by means of the stabilizer A are increased by 2.4 times and 1.7 times than those by use of the portland cement,respectively.The results from the scanning electron microscopy（SEM）,X-ray Diffraction（XRD） and energy-dispersive X-ray（EDXA） tests show that when using the stabilizer A to stabilize the soil sample TT,besides generating similar hydration products with portland cement,the stabilizer A can react with NaCl in the soil sample TT to generate Ca4Al2Cl2O6？10H2O,which greatly increases the strength of the stabilized dredger fill by its solid volume expansion.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2011年第8期1240-1245,共6页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(50278007)
