论文部分内容阅读
分别采用盐酸、氢氧化钠、氯化钠溶液处理天然沸石,然后用脂肪胺溶液进行表面改性,研究了化学处理对天然沸石含水率、孔隙度和比表面积的影响,探讨了脂肪胺在天然沸石表面的结合方式及其对沥青与集料粘附性的改善效果,并通过沥青混合料体积性能和路用性能的测试,评价了改性天然沸石的温拌作用。结果表明:氢氧化钠溶液和盐酸溶液处理均明显增加了天然沸石的含水量,但盐酸溶液处理的天然沸石水分脱除较快,而氢氧化钠溶液处理的天然沸石水分释放缓慢;比表面积及孔结构分析表明天然沸石经1 mol/L氢氧化钠溶液处理后,比表面积和孔体积分别提高了37%和26.5%;红外光谱分析表明脂肪胺以化学结合方式吸附在天然沸石表面,改善了天然沸石沥青混合料的水稳定性能;在拌合与压实温度均降低30℃的条件下,改性天然沸石温拌沥青混合料的性能与热拌沥青混合料相近,冻融劈裂强度比还有一定程度的提高。
The natural zeolites were treated with hydrochloric acid, sodium hydroxide and sodium chloride, respectively, and then surface modified with aliphatic amine solution. The effects of chemical treatment on the moisture content, porosity and specific surface area of natural zeolite were studied. Zeolite surface and its improving effect on the adhesion of asphalt and aggregate. Through the test of volumetric performance and road performance of asphalt mixture, the warm mixing effect of modified natural zeolite was evaluated. The results showed that both the sodium hydroxide solution and the hydrochloric acid solution significantly increased the water content of natural zeolite, but the natural zeolite treated with hydrochloric acid solution quickly removed water, whereas the natural zeolite treated with sodium hydroxide solution released slowly. The specific surface area and The pore structure analysis showed that the specific surface area and the pore volume increased by 37% and 26.5% respectively when the natural zeolite was treated with 1 mol / L sodium hydroxide solution. FTIR analysis showed that the fatty amine adsorbed on the natural zeolite surface by chemical bonding improved the Natural zeolite asphalt mixture of water stability; in the mixing and compaction temperature are reduced by 30 ℃ conditions, modified zeolite warm mix asphalt performance and hot mix asphalt mixture similar to freeze-thaw splitting strength ratio There is a certain degree of improvement.