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一、填空题(共25分,每空1分)vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

1、材料的(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
力学vý¾ö·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。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·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(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
干筛vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)法、(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
水筛vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)法和(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
负压筛析vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)法。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

3、混凝土用砂、石的含泥量是指公称粒径小于(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
0.080vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
mm的颗粒含量。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

4、大体积混凝土施工时,宜用(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
缓凝vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)减水剂;寒冷条件下宜用(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
防冻vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)减水剂。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·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)。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

6、砂浆和易性的好坏主要处决于(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
流动性vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)和(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
粘聚性vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
),前者用(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
稠度vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)表示,后者用(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
分层度vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)表示。。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

7、钢材随含碳量的(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
提高vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)强度增高,而延展性、冲击韧性随之(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
降低vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)。碳素钢中的硫含量影响其(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
热加工性能vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
);磷含量影响其(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
冷加工性能vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

8、土壤液限是土的(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
可塑vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)状态和(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
流动vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)状态的分界含水量,塑限是(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
半固体vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)状态和(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
可塑vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)状态的分界含水量。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

二、单项选择题(共7分,每题1分)vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·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(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
Bvý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

A.干砂重/1avý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
B
.干砂重×1avý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

C.干砂重/1avý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
D
.干砂重×1avý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·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。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

A105vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
B
095vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
C
090vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

3、横截面面积为3142mm2的光圆钢筋,当屈服力Fs76 5kN时,屈服点为(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
Bvý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
MPavý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

A243MPavý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
B
245MPavý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
C
240MPavý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

4、有一组数据023034204,其和应为(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
Dvý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

A092vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
B
0922vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
C
09vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
D
10vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·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(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
Bvý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

A.水泥用量vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
B
.用水量vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
C
.水灰比vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
D
.砂率vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

6、当水泥细度检验结果发生争议时,应以(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
Avý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)法为准。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

A.负压筛析法vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
B
.干筛法vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
C
.水筛法vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

7、有一组混凝土检查试件,其抗压强度数据为314MPa 264MPa223MPa ,该组混凝土试件的抗压强度代表值为(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
Cvý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
)。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

A264MPavý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
B
260MPavý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
C
.不作为评定依据vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

三.多项选择题(共8分,每题1分)vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

1、可以用于制做抗渗混凝土的水泥有( ABD )。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

A.普通硅酸盐水泥vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
B
.火山灰质硅酸盐水泥vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

C.矿渣硅酸盐水泥vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
D
.硅酸盐水泥vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

2、下列水泥质量指标中,当(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
A
Cvý¾ö·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。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

A.细度vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
B
.氧化镁vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
C
.强度vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
D
.安定性vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
E
.三氧化硫vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

3、混凝土用砂的有害物质为( ABCDE )。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

A.云母vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
B
.泥块vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
C
.有机物vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
D
.轻物质vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
E
.氯离子vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

4、在室内测定土的密度试验方法有( CD )。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

A.灌砂法vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
B
.核子仪法vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
C
.环刀法vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
D
.蜡封法vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
E
K30vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

5、钢筋的一般检验项目包括( ACEH )。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

A.屈服强度vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
B
.疲劳强度vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
C
.延伸率vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
D
.硬度vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

E.弯曲vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
F
.冲击韧性vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
G
.钢铁化学分析vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
H
.极限强度vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

6、喷射混凝土可以加入的外加剂是(B D vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

Avý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
早强剂vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
Bvý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
减水剂vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
Cvý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
引气剂vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
Dvý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
速凝剂vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

7、夏季混凝土施工应掺外加剂是( C Dvý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

A)高效减水剂vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
B)早强减水剂vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
C)缓凝剂vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
D)缓凝减水剂vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

8、混凝土配合比设计的主要参数是(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
A
CDvý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

A)水灰比vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
B)单方混凝土水泥用量vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
C)单方混凝土用水量;vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
D)砂率。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

四.判断题(共5分,每题0.5分,正确打,错误打×vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

1、试验前必须对仪器设备进行检查,并做好记录。(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·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。(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

3、混凝土抗压强度的保证率应达到95%。(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·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。(×vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·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。( × vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

6、土的密度是指土的单位体积的质量。(vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

7、钢材试验可以在任意室温下进行。( × vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·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。( × vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

9、不合格水泥就是废品。( × vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·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AB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。( × vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

五.简答题(共20分,每题5分)vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·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?vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·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。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·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?vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·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vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·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。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·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?vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·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510S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。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·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100的现象,试分析其原因?vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

答:可能是取样部位不具代表性,遇有石子所致。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

六.计算题(共35分,每题7分)vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

1、用灌砂法测得灌满试坑的砂子质量为2720kg(砂子的密度为170g/cm3 ),试坑内挖出的湿土总质量为2760kg,用烘干法测得含水率为95%,试计算土的干密度和湿密度?vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

解:椐已知条件得试坑容积为:2720g÷1.70g/cm3=1600cm3vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

故湿密度为:vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
2760g÷1600cm3=1.72g/cm3
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

椐已知条件得干土质量为:2760g÷1+0.095=2520gvý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

故干密度为:vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
2520g÷1600cm3=1.58g/cm3
vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

答:该土的干密度为1.58g/cm3,湿密度为1.72g/cm3vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

2、一组水泥胶砂试件的28天抗压强度值为517 475 514 468 522vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

575MPa),问该组水泥胶砂试件的28天抗压强度是多少? vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

解:(51.7+47.5+51.4+46.8+52.2+57.5÷6=51.2MPavý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

57.5÷51.2=1.123vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
舍去57.5MPa,取余下5个值平均值为:vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

51.7+47.5+51.4+46.8+52.2÷5=49.9MPavý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·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。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

答:该组水泥胶砂试件的28天抗压强度为49.9MPa)。vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·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?vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

解:砂含水率为:vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
1000-960÷960=4.2%vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

石子含水率为:(2000-1960÷1960=2.0%vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

理论配合比为:320/320770/3201170/320180/320=12.413.660.56vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

施工配合比:12.41×1+0.042):3.66×1+0.020):(0.56-0.042×2.41-0.020×3.66vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

=12.513.730.39vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN

答:施工配合比为12.513.730.39vý¾ö·Ã+åbbs.3c3t.comëTöøöKÿUN
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