共查询到18条相似文献，搜索用时 687 毫秒
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《嘉应学院学报》2017,(11):66-71
反射裂缝应力吸收层系统由高弹性不透水的热沥青中面层和推荐使用的SBS改性热拌沥青罩面层构成,中面层采用聚合物改性沥青粘结料,沥青含量高,混合料中细骨料比重大.而目前使用SBS生产的改性沥青成本较高,在这个情况下,茂名沥青储运中心和同济大学合作,通过分析研究,针对目前SBS改性沥青存在的成本高、橡胶粉沥青指标较差的问题,确立了橡胶粉、SBS高分子改性剂相结合的复合试验方法;通过不同的配合比试验和沥青性能试验,确定橡胶粉的最佳掺量为15%,SBS的最佳掺量为5%,实验结果表明,橡胶粉复合改性沥青PG分级可以达到PG76-34,软化点大于85度,老化前5度延度大于60 cm,老化后5度延度大于40 cm.橡胶粉复合改性沥青性能优越,可以变废为宝,节约生产成本,符合绿色、环保、低碳的发展理念. 相似文献
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为了研究SBS改性沥青的储存稳定性,将不同SBS改性剂掺量的SBS改性沥青储存于不同条件下.采用混合水平正交设计,选取SBS改性剂掺量、储存时间、储存温度和容器尺寸作为混合水平正交设计OA16(31×44)中的因素.提出用离析软化点差(试样的顶部和底部环与球法软化点差)和平均软化点(试样的顶部和底部环与球法软化点的算术平均值)分别评价在储存期间改性沥青的离析和老化.结果显示,改性沥青的离析和老化随储存温度和储存时间呈现复杂的变化规律.当储存温度从20℃上升到120℃时,离析软化点差变小,当超过120℃时增大,而平均软化点随储存时间的延长而降低.不同储存条件对SBS改性沥青的储存稳定性的影响各有差异. 相似文献
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为了在橡胶改性沥青的基础上继续提高废旧橡胶的利用率,同时解决橡胶改性沥青黏度大、易离析的问题,将易溶于沥青基体的活化橡胶与硫化橡胶共同掺入基质沥青进行改性,制备高掺量活-硫共混橡胶（activated-vulcanized compound rubber,AVCR）改性沥青。通过改性沥青聚合物离析试验、沥青动态剪切试验和沥青低温弯曲蠕变试验,测试AVCR改性沥青的技术性能,通过高温车辙、三轴压缩、低温小梁弯曲和冻融劈裂试验,对比AVCR改性沥青混合料相对于硫化橡胶（vulcanized rubber,VR）改性沥青混合料和SBS改性沥青混合料在路用性能方面的优势,利用扫描电子显微镜（scanning electron microscope,SEM）观察并分析AVCR改性沥青的微观机理。结果表明：相比于VR改性沥青和SBS改性沥青,AVCR改性沥青的失效温度分别提高了15.1℃和20.5℃,蠕变劲度模量分别降低了76 MPa和89 MPa,高低温性能均有明显提升;AVCR改性沥青混合料相比其他2种改性沥青混合料,高温性能和抗水损坏性能优良,低温抗裂性能突出,其最大弯拉应变分别比SBS和V... 相似文献
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《赤峰学院学报(自然科学版)》2008,(2)
在良好的设计配合比和施工条件下,高性能沥青路面(SBS改性沥青Superpave 20)中面层能提高沥青路面的耐久性和高温稳定性.根据赤峰至通辽高速公路撒力巴至下洼段的施工试验情况,简要讲述SBS改性沥青中面层的施工技术要求. 相似文献
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聚合物SBS改性沥青研究 总被引：1，自引：0，他引：1
通过沥青基本性能测试及荧光显微镜微观分析研究了聚合物SBS改性沥青的性能。结果表明:当SBS含量小于4%时,改性剂粒子以球形均匀的分布于沥青中并且改性剂粒子之间没有相互连接,SBS含量达到6%时改性剂出现了“互穿网络”结构。SBS的加入使得沥青的软化点升高,针入度降低,低温延度和温度敏感系数提高;但随着SBS含量的增大,改性沥青储存稳定性变差,软化点差在SBS含量3%时就达20℃以上,远远不能达到规范要求的标准。 相似文献
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王伟 《长江工程职业技术学院学报》2015,(1):1-2,7
同步碎石封层在我国的使用范围很广,如湖北、四川、陕西、河北等地均有不同范围使用。SBS改性沥青同步碎石封层是其中一种,必须经过妥善处置才能保障施工质量,现就四川桃巴高速公路简单介绍SBS改性沥青同步碎石封层施工技术。 相似文献
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沥青路面易损病害易发生在水泥混凝土加铺沥青混凝土、地势坑凹多雨水、斜坡、转弯及十字路口、公交站等路段.合理设计路面结构、加强沥青路面防水设计、严格控制施工质量是沥青路面易损病害的主要防治措施. 相似文献
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沥青混合料油石比的大小是与矿料的表面积相关的，建立沥青膜的薄(贫)、厚(富)与表面积的关系，对油石比的合理与否有积极意义。文章旨在量化内在关系，克服主观评价，使油石比趋于合理。 相似文献
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采用新颖的增黏树脂复配物 ,与适当比例的SBS弹性体及合适的混合溶剂相配合 ,获得一种价廉物美的新型胶黏剂 相似文献
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OBJECTIVE: To determine whether there is an age-specific incidence of hospitalized cases of Shaken Baby Syndrome (SBS) that has similar properties to the previously reported "normal crying curve," as a form of indirect evidence that crying is an important stimulus for SBS. DESIGN AND SETTING: The study analyzed cases of Shaken Baby Syndrome by age at hospitalization from hospital discharge data for California hospitals from October 1996 through December 2000. PATIENTS: All cases of children less than 18 months (78 weeks) of age for whom the diagnostic code for Shaken Baby Syndrome (995.55) in the International Classification of Disease, Ninth Edition, Clinical Modification was assigned. RESULTS: There were 273 hospitalizations for SBS. Like the "normal crying curve," the curve of age-specific incidence starts at 2-3 weeks, has a clear peak, and declines to baseline by about 36 weeks of age. In contrast to the normal crying curve that peaks at 5-6 weeks, the peak of SBS hospitalizations occurs at 10-13 weeks. CONCLUSIONS: The age-specific incidence curve of hospitalized SBS cases has a similar starting point and shape to the previously reported normal crying curve but the peak occurs about 4-6 weeks later. Of the likely predisposing causes, this pattern is only consistent with the properties of early crying. There are numerous explanations for the lag in the peaks between crying and SBS hospitalizations, including the possibility of repeat shakings prior to hospitalization. The importance of crying as a stimulus to SBS may provide an opportunity for preventive intervention. 相似文献
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本文采用了SBS和EVA作为沥青的改性剂,通过延度、软化点、针入度、抗剥落程度和热损失试验,对改性后沥青的各项指标进行测试,确定SBS和EVA的最佳实验配比. 相似文献
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Ekber Tomul Havva Sebile Savasci 《Educational Assessment, Evaluation and Accountability》2012,24(3):175-187
This study aims to investigate the relationship between academic achievement and the socioeconomic characteristics of elementary school 7th grade students in Burdur. The population of the study are 7th grade students who had education at elementary schools in Burdur in the 2007?C2008 academic year. Two staged sampling was chosen as suitable for the aim of research. In the first stage, settlements were chosen with the random settlement group sampling method. In the second stage, schools in chosen settlements were picked up with the random method considering the number of students who have taken SBS examination. Socioeconomic variables of students generally explain 39.2?% of SBS points of student. When standard beta values are observed, variables which have the most effect on the SBS points of students are: attending a course or having private lessons, father??s education, the average monthly income per capita, attending a course or having private lessons and mother??s education. 相似文献
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Zhiwei SU Mingxing LI Ling ZHANG Chaoyang WANG Leiqing ZHANG Jingqiu XU Baiping FU 《Journal of Zhejiang University. Science. B》2021,22(3):214-222
Objective:To coat a zirconia surface with silica-zirconia using a dip-coating technique and evaluate its effect on resin-zirconia shear bond strength(SBS).Methods:A silica-zirconia suspension was prepared and used to coat a zirconia surface using a dip-coating technique.One hundred and eighty-nine zirconia disks were divided into three groups according to their different surface treatments(polishing,sandblasting,and silica-zirconia coating).Scanning electron microscopy(SEM),energy dispersive X-ray(EDX),and X-ray diffraction(XRD)were used to analyze the differently treated zirconia surfaces.Different primer treatments(Monobond N,Z-PRIME Plus,and no primer)were also applied to the zirconia surfaces.Subsequently,180 composite resin cylinders(Filtek Z350)were cemented onto the zirconia disks with resin cement(RelyX Ultimate).The SBS was measured after water storage for 24 h or 6 months.The data were analyzed by two-way analysis of variance(ANOVA).Results:SEM and EDX showed that the silica-zirconia coating produced a porous layer with additional Si,and XRD showed that only tetragonal zirconia was on the silica-zirconia-coating surface.Compared with the control group,the resin-zirconia SBSs of the,andblasting group and silica-zirconia-coating group were significantly increased(P<0.05).The silica-zirconia coating followed by the application of Monobond N produced the highest SBS(P<0.05).Water aging significantly reduced the resin-zirconia SBS(P<0.05).Conclusions:Dip-coating with silica-zirconia might be a feasible way to improve resin-zirconia bonding. 相似文献
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ＩＮＴＲＯＤＵＣＴＩＯＮＳｈｏｒｔｂｏｗｅｌｓｙｎｄｒｏｍｅｌｅａｄｓｔｏｓｉｇｎｉｆｉｃａｎｔｍｏｒｂｉｄｉｔｙａｎｄｉｓｐｏｔｅｎｔｉａｌｌｙｌｅｔｈａｌ,ｅｓｐｅｃｉａｌｌｙｗｈｅｎｉｎｔｅｓｔｉｎａｌｌｏｓｓｉｓｅｘｔｅｎｓｉｖｅａｎｄｗｈｅｎｔｈｅｐａｔｉｅｎｔｉｓｖｅｒｙｙｏｕｎｇ (Ｋｕｒｋｃｈｕｂａｓｃｈｅｅｔａｌ.,1 993;Ｗｅｂｅｒｅｔａｌ.,1 991 ;Ｖａｎｄｅｒｈｏｏｆｅｔａｌ.,1 997) .Ｄｅｓｐｉｔｅｔｈｅａｄｖａｎｃｅｓｉｎｍｅｄｉｃａｌａｎｄｓｕｒｇｉｃａｌｔｅｃｈｎｉｑｕｅａｎ… 相似文献