建筑材料计算题2.docx

1、建筑材料计算题2建筑材料计算题2第一章 材料基本性质 331(某工地所用卵石材料的密度为2.65kg/m，表观密度为2.61g/cm,堆积密度为31680 kg/m,计算此石子的孔隙率与空隙率? 2(有一块烧结普通砖，在吸水饱和状态下重2900g，其绝干质量为2550g。经干3燥并磨成细粉后取50g，用排水法测得绝对密实体积为18.62cm.试计算该砖的吸水率、密度、孔隙率? 3(某石材在气干、绝干、水饱和状态下测得抗压强度分别为174、178、165MPa，求该石材的软化系数，并判断该石材可否用于水下工程, 3334. 已知碎石的表观密度为2.65 g/cm,堆积密度为1.50 g/cm,求

2、2.5m松散状态的碎石,需要多少松散体积的砂子填充碎石的空隙?若已知砂子的堆积密度为1.55 3g/cm,求砂子的重量是多少? 5. 某立方体岩石试件，测得其外形尺寸为505050?，并测得其在绝干、自然状态及吸水饱和状态下的质量分别为325、325.3、326.1 g ，并且测得该岩石3g/cm，求该岩石的体积吸水率、质量含水率、绝干表观密度、孔的密度为2.68 隙率，并估算该岩石的抗冻性如何, 6. 某岩石试样干燥时的质量为250g，将该岩石试样浸入水中，待岩石吸水饱和3后排开水的体积为100cm，将该岩石试样用湿布擦干表面后，再次投入水中此时3排开水的体积为125 cm。求该岩石的表观密

3、度、吸水率及开口孔隙率。 37(某一块状材料的全干质量为100g，自然状态体积为40cm，绝对密实状态下3的体积为33 cm，试计算其密度、表观密度、密实度和孔隙率。 338. 某材料的密度为2.78g/cm，干表观密度为1680kg/m，现将一重930g的该材料浸入水中，吸水饱和后取出称重为1025g，试求该材料的孔隙率、重量吸水率、开口孔隙率及闭口孔隙率。 339. 已知某岩石的密度为2.65g/cm，干表观密度为 2.56g/cm，吸水率为1.5 ,，试计算该岩石中开口孔隙与闭口孔隙所占的比例。 10. 边长为5cm的岩石立方体试件，在自然状态及吸水饱和状态下的质量分别为230g和243

4、g，烘干后的质量为237g。试计算该岩石试件的含水率及吸水率。 11.已知石灰石石料切割后的外形尺寸为230?115?53?，吸水和后的重为2940g，烘干至恒重为2580g，今取其磨细并烘干后取50g，用李氏瓶测得体3积为17.81 cm。求石灰石石料的密度、表观密度、孔隙率、质量吸水率、开口of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as leading development of the city to the

5、 East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the North, the East open places to expand, Jiang an eastward connection, Ping Shan, radiation to the West; the South Bank area, the minjiang River area, Golden Sands area on a long-term basis in a reasonable s

6、pace to develop, perfect urban district along the Yangtze River in Yibin Ribbon multi-center strategic vision of space frame. Yibin Center City development construction steering extension type extended and connotation type upgrade simultaneously of mode, in Metro construction of while is committed t

7、o old city transformation and built district of perfect, through live and industry with to of reasonable layout optimization city structure, improve city traffic operation efficiency; vigorously improved city environment, shaping city features, upgrade city quality, play city of service function, fo

8、rmed has perfect modern service capacity of big city. Construction of urban green space system, promoting the construction of peripheral green space and protection of historical 孔隙率、闭口孔隙率。 12.含水率为10%的100g的湿砂，其中干砂的质量为多少克, 313.现有甲、乙两相同组成的材料，密度为2.7 g/cm。甲材料的绝干表观密度为331400 kg/m，质量吸水率为17%，乙材料吸水饱和后的表观密度为18

9、62 kg/m，条件吸水率为46.2%。试求:甲材料的孔隙率和体积吸水率;乙材料的绝干表观密度和孔隙率;评价甲、乙两材料，指出哪种材料更宜作为外墙材料。为什么, 第三章 水泥 1. 进场32.5号普通硅酸盐水泥,送实验室检验,28天强度结果如下: 抗压破坏荷载:54.0、53.5、56.0、52.0、55.0、54.0KN 抗折破坏荷载:2.83、2.81、2.82KN 问该水泥28天试验结果是否达到原等级强度?该水泥存放期已超过三个月,可否凭上述试验结果判定该水泥仍按原强度等级使用? 2. 建筑材料试验室对一普通硅酸盐水泥试样进行了检测，试验结果如表所示，试确定其强度等级。 抗折强度破坏荷载

10、(KN) 抗压强度破坏荷载(KN) 3D 28D 3D 28D 1.25 2.90 23 75 29 71 1.60 3.05 29 70 28 68 1.50 2.75 26 69 27 70 第四章 混凝土 1. 某混凝土配合比为1:2.43:4.71，W/C=0.62，设混凝土表观密度为2400，求各材料用量。 2. 某框架结构工程现浇钢筋混凝土梁，混凝土设计强度等级为C30，施工要求混凝土坍落度为3050mm，根据放工单位历史资料统计混凝土强度标准差为5 MPa，所用材料情况如下: 水泥:42.5级普通硅酸盐水泥，水泥密度为3.1，水泥强度等级标准值的富of vision Yibin

11、formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the North, the East open places to expand, Jiang an eastward connection,

12、Ping Shan, radiation to the West; the South Bank area, the minjiang River area, Golden Sands area on a long-term basis in a reasonable space to develop, perfect urban district along the Yangtze River in Yibin Ribbon multi-center strategic vision of space frame. Yibin Center City development construc

13、tion steering extension type extended and connotation type upgrade simultaneously of mode, in Metro construction of while is committed to old city transformation and built district of perfect, through live and industry with to of reasonable layout optimization city structure, improve city traffic op

14、eration efficiency; vigorously improved city environment, shaping city features, upgrade city quality, play city of service function, formed has perfect modern service capacity of big city. Construction of urban green space system, promoting the construction of peripheral green space and protection

15、of historical 余系数为1.08; 砂:中砂，级配合格，砂子表观密度2.6; 石子:530mm，碎石，级配合格，石子表观密度2.65; 试求1.混凝土计算配合比;2.若经试配混凝土的和易性强度等均符合要求，无需作调整，又知现场砂子含水率3%，石子含水率为1%，试计算混凝土施工配合比。 3. 某混凝土采用下列参数:W/C=0.47，W=175， S=3.1， S=2.55，G=2.65，SP=36%，试按体积法计算该混凝土的配合比(引入空气量按1%计)。 4. 假设混凝土抗压强度随龄其的对数而直线增长，已知1天强度不等于0，7天抗压强度为21 MPa，14天抗压强度26 MPa，求2

16、8天抗压强度。(提示:?7=0.845，?14=1.1461，?28=1.4472) 5. 某混凝土拌合物经试拌调整满足和易性要求后，各组成材料用量为水泥3.15kg，水1.89kg，砂6.24kg，卵石12.48kg，实测混凝土拌合物表观密度为332450kg/m。试计算每m混凝土的各种材料用量。 6.项某工程用混凝土，经试配调整，得到和易性和试配强度均合格后的材料用量，石子12.65?，实测拌合物成形后体为:水泥3.2?，水1.85?，砂6.30?积密度为2450。试计算该混凝土实验室配合比,若堆场砂子含水5%，石子含水2.5%，试计算施工配合比。 7(现有一组150150150mm的混凝

17、土试块，标准养护28d后做抗压强度试验，得到破坏荷载分别为720、700、750kN，求该组混凝土强度的平均值。 8(取500g干砂，经筛分后，其结果见下表，试计算该砂的细度模数，确定砂的粗细程度。 筛孔尺寸(mm) 4.75 2.36 1.18 0.60 0.30 0.15 筛底 筛余量(g) 10 70 100 210 80 20 10 9. 已知某混凝土的试验室配合比为 C?S ?G , 1?1.92 ?3.97 ， W/C, 3 0.56, 配制1m混凝土水泥用量为300kg 。施工现场砂、石的含水率分别为5% 和1% ，求施工配合比。 10. 假设混凝土抗压强度随龄期的对数而直线增长

18、，已知1d强度不等于0，7d抗压强度为21MPa，14d抗压强度为26.0MPa，求28d强度为多少? of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the N

19、orth, the East open places to expand, Jiang an eastward connection, Ping Shan, radiation to the West; the South Bank area, the minjiang River area, Golden Sands area on a long-term basis in a reasonable space to develop, perfect urban district along the Yangtze River in Yibin Ribbon multi-center str

20、ategic vision of space frame. Yibin Center City development construction steering extension type extended and connotation type upgrade simultaneously of mode, in Metro construction of while is committed to old city transformation and built district of perfect, through live and industry with to of re

21、asonable layout optimization city structure, improve city traffic operation efficiency; vigorously improved city environment, shaping city features, upgrade city quality, play city of service function, formed has perfect modern service capacity of big city. Construction of urban green space system,

22、promoting the construction of peripheral green space and protection of historical 11. 已知某材料干燥状态时的破坏荷载为240KN，饱水时的破坏荷载为180KN，问该材料是否适合用作经常与水接触的工程部位的结构材料。 12. 已知某混凝土的试验室配合比为 C?S?G , 1 ? 1.92 ? 3.97 ， W/C 3, 0.56, 配制 1m混凝土水泥用量为300kg 。施工现场砂、石的含水率分别为 5% 和 1% ，求施工配合比。 13. 某混凝土配合比为 1?2.43? 4.71 ， W/C , 0.62

23、，设混凝土表观密度为 32400 kg/ m 计，求各材料用量。 14. 某混凝土配合比为1?2.20?4.20，W/C,0.60，已知水泥、砂、石表观密度3(kg/m)为分别为3100，2600和2500，试计算每立方米拌合物所需各材料用量。 15(某工程用砌砖砂浆设计强度等级为M10，稠度要求为80100mm的水泥石3灰砂浆，现有砌筑水泥的强度为32.5MPa,细集料为堆积密度为1450kg/m的中砂,含水率为2%,已知石灰膏的稠度为100mm,施工水平一般，计算此砂浆的配合比。 第六章 墙体材料 1(某烧结普通砖试验，10块砖样的抗压强度值(MPa)分别为:14.2、21.1、9.5、2

24、2.9、13.3、18.8、18.2、18.2、19.8、19.8,试确定该砖的强度等级。 22. 试计算砌筑4000M的一砖墙即墙厚240 mm时，需用烧结普通砖多少块(考虑有2%的材料损耗) 第七章 建筑钢材 1. 从一批钢筋中抽样，并截取两根钢筋做拉伸试验，测得如下结果:屈服下限荷载分别为42.4KN、42.8KN，抗拉极限荷载分别为62.0KN，63.4KN，钢筋公称直径为12mm，标距长为60mm，拉断时标距长度为70.6和71.4mm，试评定其级别，说明其利用率及使用中安全可靠程度如何, 第八章 木材 1. 一块松木试件长期置于相对湿度为60%、温度为20?的空气中，其平衡含水率为

25、12.8%，测得顺纹抗压强度为49.4 MPa，问些木材在标准含水率情况下抗压强度为多少, 2. 已知松木的顺纹抗压强度为39.8 MPa，含水率为25%，求此木材在标准含水of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new visio

26、n to expand, Naxi district to the North, the East open places to expand, Jiang an eastward connection, Ping Shan, radiation to the West; the South Bank area, the minjiang River area, Golden Sands area on a long-term basis in a reasonable space to develop, perfect urban district along the Yangtze Riv

27、er in Yibin Ribbon multi-center strategic vision of space frame. Yibin Center City development construction steering extension type extended and connotation type upgrade simultaneously of mode, in Metro construction of while is committed to old city transformation and built district of perfect, thro

28、ugh live and industry with to of reasonable layout optimization city structure, improve city traffic operation efficiency; vigorously improved city environment, shaping city features, upgrade city quality, play city of service function, formed has perfect modern service capacity of big city. Constru

29、ction of urban green space system, promoting the construction of peripheral green space and protection of historical 率时的顺纹抗压强度, of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as leading development of the city to the East along the Yang

30、tze River. Shi Gu area, lingang new vision to expand, Naxi district to the North, the East open places to expand, Jiang an eastward connection, Ping Shan, radiation to the West; the South Bank area, the minjiang River area, Golden Sands area on a long-term basis in a reasonable space to develop, per

31、fect urban district along the Yangtze River in Yibin Ribbon multi-center strategic vision of space frame. Yibin Center City development construction steering extension type extended and connotation type upgrade simultaneously of mode, in Metro construction of while is committed to old city transform

32、ation and built district of perfect, through live and industry with to of reasonable layout optimization city structure, improve city traffic operation efficiency; vigorously improved city environment, shaping city features, upgrade city quality, play city of service function, formed has perfect modern service capacity of big city. Construction of urban green space system, promoting the construction of peripheral green space and protection of historical