一种新固化材料固化滨海氯盐渍土的试验研究

Experimental study on a new stabilizer for stabilizing coastal chlorine soil

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.