为提供一种全天候路面坑槽修补材料,采用多种矿质黏土和3种稀释剂制备冷补沥青混合料.通过标准马歇尔试验、浸水马歇尔试验、低温和易性试验、冻融劈裂试验和车辙试验等室内试验,系统地研究了冷补沥青混合料的路用性能.结果表明,稀释剂对冷补沥青混合料的马歇尔强度和低温和易性具有一定影响.加入重油可以提高混合料的马歇尔强度,但是重油的加入量过多则会影响混合料的低温和易性,因此,将柴油-重油作为最佳稀释剂.矿质黏土制备的冷补沥青混合料路用性能良好,马歇尔强度不小于4.43 k N,残留稳定度不小于85%,冻融劈裂强度比大于80%,动稳定度大于907.781次/mm.矿质黏土改性沥青的过程仅为物理混合过程,加入矿质黏土后沥青表面呈现不规则波状结构.
A new approach for assembling amperometric mushroom pulp tissue based membrane electrode for determination of L tyrosine analysis is proposed. Ferrocene is used as a mediator of electron transfer between tyrosinase in mushroom tissue and a graphite electrode. The optimal operation conditions are studied. The linear response range of the biosensor is 2 0×10 -4 to 4 5×10 -3 mol·L -1 with response time of less than 5 min and lifetime of at least 30 d. The biosensor can be applied to practical sample analysis.
