按考试大纲精编(公路问答题试验工程师)
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ1、简要写出普通沥青混合料配合比设计流程。
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ答:(1)根据沥青混合料类型选择规范规定的矿料级配范围。
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ(2)确定工程设计级配范围
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ(3)材料选择取样、试验
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ(4)在工程设计级配范围优选1-3组不同的矿料级配
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ(5)对设计级配,初选5组沥青用量,拌合混合料,制作马歇尔试件
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ(6)确定理论最大相对密度、测定试件毛体积相对密度进行马歇尔试验
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ(7)技术经济分析确定1组设计级配及最佳沥青用量
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ(8)进行车辙试验,浸水马歇尔试验,冻融劈裂试验,矿渣膨胀试验等。
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ(9)完成配合比设计,提交材料品种、配比、矿料级配、最佳沥青用量。
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ2、某高速公路水泥稳定碎石基层,已知设计抗压强度Rd=3.1MPa,现测得某段的无侧限抗压强度数值如下,对该段强度结果进行评定并计算其得分值。(规定分为20分,保证率为95%,Za=1.645)3.85
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ4.01
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ3.53
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ3.96
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ4.00
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ3.73
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ3.86
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ3.97
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ3.93
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ4.05
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ3.52
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ3.83
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ解: R=3.85
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛCv=0.046
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛxá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛRd/(1-ZaCv)=3.1/(1-1.645*0.046)=3.35
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛR>Rd/(1-ZaCv)
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛxá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ合格,得满分20分。
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ3、某一级公路沥青路面总厚度检测值(cm)分别为: 15.1 14.3 14.5
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ14.4
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ14.7
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ15.0
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ15.3
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ14.2
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛxá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ14.8
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ14.9
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ14.5
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ14.3
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ14.8
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ14.4
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ15.2
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ14.7
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ按保证率95%,计算其厚度代表值。(已知t0.95/√16=0.438)
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ解:X=14.7
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛS=0.34
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛXL=X- t0.95*S /√16=14.7-0.34*0.438=14.6
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ其厚度代表值为:14.6cm
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ4、简要叙述沥青混合料中沥青含量有哪些测定方法
xá =Ý«Ù%ûbbs.3c3t.com¶¶=©Þ`öÛ射线法:测定用粘稠石油沥青拌制的热拌沥青混合料中沥青用量,适用于沥青路面施工时沥青用量检测,以快速评定拌合厂工作质量。
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