一、填空题(共25分,每空1分)vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 1、材料的(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
力学vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)性质,是材料在外力作用下抵抗变形和破坏的能力。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 2、水泥细度是控制水泥质量的重要指标之一。水泥细度检验时的筛析方法有(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
干筛vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)法、(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
水筛vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)法和(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
负压筛析vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)法。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 3、混凝土用砂、石的含泥量是指公称粒径小于(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
0.080vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)mm的颗粒含量。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 4、大体积混凝土施工时,宜用(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
缓凝vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)减水剂;寒冷条件下宜用(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
防冻vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)减水剂。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 5、普通混凝土常用的水泥种类有(硅酸盐水泥)、(普通水泥)、(矿渣水泥)、(火山灰水泥)、(粉煤灰水泥)和(复合水泥)。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 6、砂浆和易性的好坏主要处决于(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
流动性vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)和(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
粘聚性vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
),前者用(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
稠度vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)表示,后者用(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
分层度vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)表示。。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 7、钢材随含碳量的(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
提高vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)强度增高,而延展性、冲击韧性随之(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
降低vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)。碳素钢中的硫含量影响其(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
热加工性能vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
);磷含量影响其(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
冷加工性能vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 8、土壤液限是土的(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
可塑vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)状态和(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
流动vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)状态的分界含水量,塑限是(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
半固体vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)状态和(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
可塑vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)状态的分界含水量。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 二、单项选择题(共7分,每题1分)vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 1、工地测得湿砂的含水率为a,则施工配合比中湿砂的实际用量应为(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
Bvý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN A.干砂重/(1+a)vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
B.干砂重×(1+a)vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN C.干砂重/(1-a)vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
D.干砂重×(1-a)vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 2、当混凝土试件采用边长为100mm3的立方体时,抗压结果折算标准试件抗压强度时应乘以( B )系数。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN A.1.05vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
B.0.95vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
C.0.90vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 3、横截面面积为314.2mm2的光圆钢筋,当屈服力Fs为76. 5kN时,屈服点为(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
Bvý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)MPa。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN A.243MPavý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
B.245MPavý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
C.240MPavý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 4、有一组数据0.23、0.342和0.4,其和应为(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
Dvý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN A.0.92vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
B.0.922vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
C.0.9vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
D.1.0vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 5、混凝土配合比设计中的各项参数,对混凝土坍落度影响最大的参数是(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
Bvý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN A.水泥用量vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
B.用水量vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
C.水灰比vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
D.砂率vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 6、当水泥细度检验结果发生争议时,应以(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
Avý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)法为准。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN A.负压筛析法vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
B.干筛法vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
C.水筛法vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 7、有一组混凝土检查试件,其抗压强度数据为31.4MPa 、26.4MPa和22.3MPa ,该组混凝土试件的抗压强度代表值为(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
Cvý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN A.26.4MPavý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
B.26.0MPavý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
C.不作为评定依据vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 三.多项选择题(共8分,每题1分)vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 1、可以用于制做抗渗混凝土的水泥有( A、B、D )。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN A.普通硅酸盐水泥vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
B.火山灰质硅酸盐水泥vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN C.矿渣硅酸盐水泥vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
D.硅酸盐水泥vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 2、下列水泥质量指标中,当(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
A、Cvý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)中任意一项不符合标准规定时,则判为水泥不合格。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN A.细度vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
B.氧化镁vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
C.强度vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
D.安定性vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
E.三氧化硫vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 3、混凝土用砂的有害物质为( A、B、C、D、E )。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN A.云母vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
B.泥块vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
C.有机物vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
D.轻物质vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
E.氯离子vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 4、在室内测定土的密度试验方法有( C、D )。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN A.灌砂法vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
B.核子仪法vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
C.环刀法vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
D.蜡封法vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
E.K30法vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 5、钢筋的一般检验项目包括( A、C、E、H )。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN A.屈服强度vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
B.疲劳强度vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
C.延伸率vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
D.硬度vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN E.弯曲vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
F.冲击韧性vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
G.钢铁化学分析vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
H.极限强度vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 6、喷射混凝土可以加入的外加剂是(B D )vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN (A)vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
早强剂vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
(B)vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
减水剂vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
(C)vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
引气剂vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
(D)vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
速凝剂vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 7、夏季混凝土施工应掺外加剂是( C D)vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN (A)高效减水剂vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
(B)早强减水剂vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
(C)缓凝剂vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
(D)缓凝减水剂vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 8、混凝土配合比设计的主要参数是(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
A、C、Dvý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN (A)水灰比vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
(B)单方混凝土水泥用量vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
(C)单方混凝土用水量;vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
(D)砂率。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 四.判断题(共5分,每题0.5分,正确打√,错误打×)vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 1、试验前必须对仪器设备进行检查,并做好记录。( √ )vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 2、试验室所用计量仪器设备,凡是没有检定规程的都必须进行自校。( √ )vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 3、混凝土抗压强度的保证率应达到95%。( √ )vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 4、水泥负压筛的修正系数取值有效范围,规范未做规定。(×)vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 5、混凝土强度检验评定标准GBJ107—87与铁路混凝土强度检验评定标准TB10425—94是完全一致的。( × )vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 6、土的密度是指土的单位体积的质量。( √ )vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 7、钢材试验可以在任意室温下进行。( × )vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 8、试验记录和试验报告允许划改,但应将正确数据填写在划改数据的右上方,并加盖划改人名章。( × )vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 9、不合格水泥就是废品。( × )vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 10、对仪器设备实行标志管理,当某压力机经计量测试部门进行周期计量检定后,其C度盘不合格,但A、B两度盘合格,并签发有检定证书,故将该压力机贴上绿色合格证管理标志。( × )vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 五.简答题(共20分,每题5分)vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 1、《铁路混凝土与砌体工程施工质量验收标准》(TB10424-2003)规定必须采用同条件养*制作抗压强度试件对结构实体强度进行检验的结构有哪些?具体是如何规定的?vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 答:桥梁、墩台、隧道衬砌。桥梁每墩台、每孔(片)梁和隧道每200米衬砌应按不同强度等级制作同条件养*抗压强度试件不少于一次。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 2、砌筑砂浆的抗压强度只与水泥用量和水泥强度等级有关,这句话对不对?为什么?vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 答:不对。砌筑砂浆有砌砖砂浆和砌石砂浆之分,对砌砖砂浆来说其强度只与水泥强度vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 等级及水泥用量有关;而对砌石砂浆来说,其强度不仅与水泥强度等级及水泥用量有关,而且与水有关,即还与水灰比有关。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 3、简答混凝土坍落度试验方法和坍落度取值方法?vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 答:试验前应将坍落度筒、钢板及捣棒润湿,将坍落度筒放于钢板上,双脚踩住踏板,将混凝土拌和物分三层装入坍落度筒,每层用φ16×600弹头型捣棒沿螺旋方向自边向中插捣25次,第一层插至底部,第二层和第三层应插透本层捣至下层表面,第三层插捣完毕后用抹刀抹平顶面,双手按住坍落度筒两侧提手,双脚离开踏板,用双手将坍落度筒在5~10S内慢慢垂直提起后放在坍落试体旁,用直尺测量坍落度筒筒顶至坍落试体最高点的距离,即为混凝土拌和物坍落度,以mm计,精确到5mm。坍落度测试自装料至测试完毕要求在15min内完成。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 4、铁路路基填土密度检验时,有时会出现压实系数大于1.00的现象,试分析其原因?vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 答:可能是取样部位不具代表性,遇有石子所致。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 六.计算题(共35分,每题7分)vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 1、用灌砂法测得灌满试坑的砂子质量为2.720kg(砂子的密度为1.70g/cm3 ),试坑内挖出的湿土总质量为2.760kg,用烘干法测得含水率为9.5%,试计算土的干密度和湿密度?vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 解:椐已知条件得试坑容积为:2720g÷1.70g/cm3=1600cm3vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 故湿密度为:vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
2760g÷1600cm3=1.72g/cm3vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 椐已知条件得干土质量为:2760g÷(1+0.095)=2520gvý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 故干密度为:vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
2520g÷1600cm3=1.58g/cm3vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 答:该土的干密度为1.58g/cm3,湿密度为1.72g/cm3。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 2、一组水泥胶砂试件的28天抗压强度值为51.7 、47.5 、51.4、 46.8 、52.2、vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 57.5(MPa),问该组水泥胶砂试件的28天抗压强度是多少? vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 解:(51.7+47.5+51.4+46.8+52.2+57.5)÷6=51.2(MPa)vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN ∵57.5÷51.2=1.123vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
∴舍去57.5MPa,取余下5个值平均值为:vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN (51.7+47.5+51.4+46.8+52.2)÷5=49.9(MPa)vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 余下的5个值与平均值之差均未超过±10%,故取49.9MPa为抗压强度结果。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 答:该组水泥胶砂试件的28天抗压强度为49.9(MPa)。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 3、强度等级为C25的混凝土,按理论配合比计算得每立方米混凝土各项材料用量分别为:水泥320kg、砂子770kg、石子1170kg、水180kg。取现场砂样1kg,炒干后为960g;取现场石子样2kg,炒干后为1960g。请计算施工配合比?vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 解:砂含水率为:vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
(1000-960)÷960=4.2%vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 石子含水率为:(2000-1960)÷1960=2.0%vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 理论配合比为:320/320:770/320:1170/320:180/320=1:2.41:3.66:0.56vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 施工配合比:1:2.41×(1+0.042):3.66×(1+0.020):(0.56-0.042×2.41-0.020×3.66)vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN =1:2.51:3.73:0.39vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN 答:施工配合比为1:2.51:3.73:0.39。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN