按考试大纲精编(公路问答题试验工程师)
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû1、简要写出普通沥青混合料配合比设计流程。
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû答:(1)根据沥青混合料类型选择规范规定的矿料级配范围。
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû(2)确定工程设计级配范围
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû(3)材料选择取样、试验
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû(4)在工程设计级配范围优选1-3组不同的矿料级配
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû(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
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû(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
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû(7)技术经济分析确定1组设计级配及最佳沥青用量
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû(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。
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû(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。
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû2、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
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû4.01
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû3.53
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû3.96
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû4.00
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû3.73
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû3.86
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû3.97
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû3.93
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû4.05
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû3.52
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû3.83
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû解: R=3.85
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙûCv=0.046
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙûñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙûRd/(1-ZaCv)=3.1/(1-1.645*0.046)=3.35
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙûR>Rd/(1-ZaCv)
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙûñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû合格,得满分20分。
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû3、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
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû14.4
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû14.7
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû15.0
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû15.3
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû14.2
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙûñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû14.8
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû14.9
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû14.5
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû14.3
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû14.8
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû14.4
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû15.2
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû14.7
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû按保证率95%,计算其厚度代表值。(已知t0.95/√16=0.438)
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû解:X=14.7
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙûS=0.34
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙûXL=X- t0.95*S /√16=14.7-0.34*0.438=14.6
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû其厚度代表值为:14.6cm
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû4、简要叙述沥青混合料中沥青含量有哪些测定方法
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû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。
ñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙûñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙûñ4¸£¯éì¹bbs.3c3t.com®²Ù«QsÙû[hide]
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