一、填空题(共25分,每空1分)\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö1、材料的(\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
力学\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
)性质,是材料在外力作用下抵抗变形和破坏的能力。\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö2、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(\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
干筛\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
)法、(\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
水筛\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
)法和(\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
负压筛析\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
)法。\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö3、混凝土用砂、石的含泥量是指公称粒径小于(\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
0.080\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
)mm的颗粒含量。\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö4、大体积混凝土施工时,宜用(\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
缓凝\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
)减水剂;寒冷条件下宜用(\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
防冻\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
)减水剂。\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö5、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)。\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö6、砂浆和易性的好坏主要处决于(\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
流动性\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
)和(\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
粘聚性\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
),前者用(\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
稠度\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
)表示,后者用(\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
分层度\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
)表示。。\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö7、钢材随含碳量的(\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
提高\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
)强度增高,而延展性、冲击韧性随之(\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
降低\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
)。碳素钢中的硫含量影响其(\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
热加工性能\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
);磷含量影响其(\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
冷加工性能\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
)。\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö8、土壤液限是土的(\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
可塑\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
)状态和(\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
流动\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
)状态的分界含水量,塑限是(\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
半固体\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
)状态和(\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
可塑\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
)状态的分界含水量。\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö \¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö二、单项选择题(共7分,每题1分)\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö1、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(\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
B\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
)。\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=ÖA.干砂重/(1+a)\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
B.干砂重×(1+a)\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=ÖC.干砂重/(1-a)\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
D.干砂重×(1-a)\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö2、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。\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=ÖA.1.05\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
B.0.95\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
C.0.90\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö3、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(\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
B\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
)MPa。\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=ÖA.243MPa\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
B.245MPa\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
C.240MPa\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö4、有一组数据0.23、0.342和0.4,其和应为(\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
D\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
)\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=ÖA.0.92\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
B.0.922\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
C.0.9\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
D.1.0\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö5、混凝土配合比设计中的各项参数,对混凝土坍落度影响最大的参数是(\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
B\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
)。\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=ÖA.水泥用量\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
B.用水量\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
C.水灰比\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
D.砂率\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö6、当水泥细度检验结果发生争议时,应以(\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
A\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
)法为准。\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=ÖA.负压筛析法\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
B.干筛法\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
C.水筛法\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö7、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(\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
C\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
)。\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=ÖA.26.4MPa\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
B.26.0MPa\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
C.不作为评定依据\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö \¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö三.多项选择题(共8分,每题1分)\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö1、可以用于制做抗渗混凝土的水泥有( A、B、D )。\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=ÖA.普通硅酸盐水泥\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
B.火山灰质硅酸盐水泥\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=ÖC.矿渣硅酸盐水泥\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
D.硅酸盐水泥\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö2、下列水泥质量指标中,当(\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
A、C\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
)中任意一项不符合标准规定时,则判为水泥不合格。\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=ÖA.细度\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
B.氧化镁\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
C.强度\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
D.安定性\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
E.三氧化硫\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö3、混凝土用砂的有害物质为( A、B、C、D、E )。\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=ÖA.云母\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
B.泥块\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
C.有机物\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
D.轻物质\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
E.氯离子\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö4、在室内测定土的密度试验方法有( C、D )。\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=ÖA.灌砂法\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
B.核子仪法\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
C.环刀法\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
D.蜡封法\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
E.K30法\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö5、钢筋的一般检验项目包括( A、C、E、H )。\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=ÖA.屈服强度\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
B.疲劳强度\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
C.延伸率\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
D.硬度\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=ÖE.弯曲\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
F.冲击韧性\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
G.钢铁化学分析\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
H.极限强度\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö6、喷射混凝土可以加入的外加剂是(B D )\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö(A)\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
早强剂\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
(B)\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
减水剂\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
(C)\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
引气剂\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
(D)\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
速凝剂\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö7、夏季混凝土施工应掺外加剂是( C D)\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö(A)高效减水剂\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
(B)早强减水剂\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
(C)缓凝剂\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
(D)缓凝减水剂\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö8、混凝土配合比设计的主要参数是(\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
A、C、D\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
)\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö(A)水灰比\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
(B)单方混凝土水泥用量\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
(C)单方混凝土用水量;\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
(D)砂率。\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö \¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö四.判断题(共5分,每题0.5分,正确打√,错误打×)\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö1、试验前必须对仪器设备进行检查,并做好记录。( √ )\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö2、试验室所用计量仪器设备,凡是没有检定规程的都必须进行自校。( √ )\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö3、混凝土抗压强度的保证率应达到95%。( √ )\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö4、水泥负压筛的修正系数取值有效范围,规范未做规定。(×)\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö5、混凝土强度检验评定标准GBJ107—87与铁路混凝土强度检验评定标准TB10425—94是完全一致的。( × )\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö6、土的密度是指土的单位体积的质量。( √ )\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö7、钢材试验可以在任意室温下进行。( × )\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö8、试验记录和试验报告允许划改,但应将正确数据填写在划改数据的右上方,并加盖划改人名章。( × )\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö9、不合格水泥就是废品。( × )\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö10、对仪器设备实行标志管理,当某压力机经计量测试部门进行周期计量检定后,其C度盘不合格,但A、B两度盘合格,并签发有检定证书,故将该压力机贴上绿色合格证管理标志。( × )\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö \¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö五.简答题(共20分,每题5分)\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö1、《铁路混凝土与砌体工程施工质量验收标准》(TB10424-2003)规定必须采用同条件养*制作抗压强度试件对结构实体强度进行检验的结构有哪些?具体是如何规定的?\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö答:桥梁、墩台、隧道衬砌。桥梁每墩台、每孔(片)梁和隧道每200米衬砌应按不同强度等级制作同条件养*抗压强度试件不少于一次。\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö \¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö2、砌筑砂浆的抗压强度只与水泥用量和水泥强度等级有关,这句话对不对?为什么?\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö答:不对。砌筑砂浆有砌砖砂浆和砌石砂浆之分,对砌砖砂浆来说其强度只与水泥强度\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö等级及水泥用量有关;而对砌石砂浆来说,其强度不仅与水泥强度等级及水泥用量有关,而且与水有关,即还与水灰比有关。\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö \¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö3、简答混凝土坍落度试验方法和坍落度取值方法?\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö答:试验前应将坍落度筒、钢板及捣棒润湿,将坍落度筒放于钢板上,双脚踩住踏板,将混凝土拌和物分三层装入坍落度筒,每层用φ16×600弹头型捣棒沿螺旋方向自边向中插捣25次,第一层插至底部,第二层和第三层应插透本层捣至下层表面,第三层插捣完毕后用抹刀抹平顶面,双手按住坍落度筒两侧提手,双脚离开踏板,用双手将坍落度筒在5~10S内慢慢垂直提起后放在坍落试体旁,用直尺测量坍落度筒筒顶至坍落试体最高点的距离,即为混凝土拌和物坍落度,以mm计,精确到5mm。坍落度测试自装料至测试完毕要求在15min内完成。\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö4、铁路路基填土密度检验时,有时会出现压实系数大于1.00的现象,试分析其原因?\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö答:可能是取样部位不具代表性,遇有石子所致。\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö \¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö六.计算题(共35分,每题7分)\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö1、用灌砂法测得灌满试坑的砂子质量为2.720kg(砂子的密度为1.70g/cm3 ),试坑内挖出的湿土总质量为2.760kg,用烘干法测得含水率为9.5%,试计算土的干密度和湿密度?\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö解:椐已知条件得试坑容积为:2720g÷1.70g/cm3=1600cm3\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö故湿密度为:\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
2760g÷1600cm3=1.72g/cm3\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö椐已知条件得干土质量为:2760g÷(1+0.095)=2520g\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö故干密度为:\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
2520g÷1600cm3=1.58g/cm3\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö答:该土的干密度为1.58g/cm3,湿密度为1.72g/cm3。\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö \¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö2、一组水泥胶砂试件的28天抗压强度值为51.7 、47.5 、51.4、 46.8 、52.2、\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö57.5(MPa),问该组水泥胶砂试件的28天抗压强度是多少? \¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö解:(51.7+47.5+51.4+46.8+52.2+57.5)÷6=51.2(MPa)\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö∵57.5÷51.2=1.123\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
∴舍去57.5MPa,取余下5个值平均值为:\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö(51.7+47.5+51.4+46.8+52.2)÷5=49.9(MPa)\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö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。\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö答:该组水泥胶砂试件的28天抗压强度为49.9(MPa)。\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö \¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö3、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?\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö解:砂含水率为:\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
(1000-960)÷960=4.2%\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö石子含水率为:(2000-1960)÷1960=2.0%\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö理论配合比为:320/320:770/320:1170/320:180/320=1:2.41:3.66:0.56\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö施工配合比:1:2.41×(1+0.042):3.66×(1+0.020):(0.56-0.042×2.41-0.020×3.66)\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö=1:2.51:3.73:0.39\¹'Sóßbbs.3c3t.com®B2$Øo=Ö
\¹'Sóßbbs.3c3t.com®B2$Øo=Ö答:施工配合比为1:2.51:3.73:0.39。\¹'Sóßbbs.3c3t.com®B2$Øo=Ö