Laboratory investigation on effects of organic montmorillonite on performance of crumb rubber modified asphalt

In this paper,organic montmorillonite(OMMT)was added into crumb rubber modified asphalt(CRMA)to improve its high temperature performance,anti-aging performance and storage stability.The effects of different OMMT content on properties of CRMA were studied.The rutting factor obtained by dynamic shear rheological(DSR)test was adopted to evaluate the high-temperature performance.The creep stiffness and m value determined by the bending beam rheometer(BBR)test were employed to evaluate the low-temperature performance.The softening point,ductility,rutting factor before and after rolling thin film ovens test(RTFOT)and pressure aging vessel test(PAV)were compared to characterize the aging properties.Moreover,the segregation test after being reserved for 48 h and 7 d was conducted,and the softening point and rutting factor of upper and lower layers of segregation pipe were adopted to evaluate the storage stability.The results indicated that the high-temperature performance and anti-aging performance were developed with the increasing content of OMMT,while the low-temperature performance deteriorated.The storage stability was improved with the increasing content of OMMT before the content exceeded 4%,after which the storage stability declined.Taking account of all factors,it is suggested that the optimum content of OMMT is 3%−4%.

百香果水牛乳酸奶的制备工艺研究

本研究以水牛乳为主料,加入百香果汁,制成口味独特、营养价值高的百香果水牛乳酸奶。通过单因素和正交试验确定该酸奶最佳工艺为:百香汁添加量为9%,发酵剂接种量为7%,发酵时间为4.5h,白砂糖添加量为9%,发酵温度为41℃。由此工艺条件制备的百香果水牛乳酸奶口感清新,品质最佳。

厂房屋顶风机降噪方案设计

工业领域深入推进噪声治理工作,厂房屋顶风机成为新的关注点。文章从工程实践中归纳了屋顶风机的治理方法,根据各类风机特征有针对地提出典型降噪措施,总结了厂房屋顶风机降噪方案的可行性、可实施性和有效性,理清了工业降噪中的屋顶风机降噪的优先级和设计流程,并结合案例为屋顶风机治理提供思路和建议。