回复:材料专业复习题
45.中型回弹仪简称HT225型回弹仪,其冲击能量为2 207J。·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
46.超声仪的使用环境温度不能太高或太低,一般在-10~+30℃范围内使用。·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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47.一般情况下,芯样直径为粗骨料粒径的3倍。·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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48.粒径大于O.075mm的颗粒含量小于50%,塑性指数Ip-15,则该土属于一粉质·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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粘士。·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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49.相对密度是用来评价砂性土的密实状态。·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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50.已知某土层的Pc>Pz(Pc为先期固结压力,Pz为土的自重)则土属于超固结~状态。·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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51.击实试验结果整理时r若有超粒径的土颗粒,则超粒径的含量小于30%可以按规范·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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公式修正。·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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52、引起硅酸盐水泥体积安定性不良的原因之一是水泥熟料游离CaO含量过多。·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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53、在级配良好的情况下,随着粗骨料最大粒径的增大,骨料的空隙率及总表面积则随·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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之均减小。·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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54、III级粉煤灰可应用于C30以下的素混凝土。·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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55、在设计混凝土配合比时,配制强度要比设计强度等级高些,提高幅度多少,取决于·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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强度保证率和施工水平。·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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56、钻芯法检测时,钻取的混凝土芯样试件,制各成高度和直径均为100w~的芯样试·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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件,按JTJ270测得的抗压强度值,是边长为150mm立方体的抗压强度的1倍。·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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57、粗粒土及路面结构层压实度检查可以采用灌砂法、水袋法或钻孔取样蜡封法。·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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58、公路路基的土的工程分类将土划分为:巨粒土、粗粒土、细粒土和特殊土。细·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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粒土的划分应根据塑性图分类;土的塑性图是以液限(w1)为横坐标、塑性指数(Ip)为纵·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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坐标构成。·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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59、液限塑限联合测定法的试验目的是计算土的天然稠度、计算塑性指数、划分土类、·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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供公路工程设计和施工使用。·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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60、混凝土修补材料的选择,应根据修补工程的技术要求、施工条件和结构的使用环境·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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条件,结合材料的物理力学性能、工艺性能和费用等因素,综合分析确定。·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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61、水质分析用水样不得少于(5L)。pH值最好在(现场)测定。全部水质检验项目应·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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在(7d )内完成。·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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62.土的缩限含水量是指塑态转为固态的界限含水量。·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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63.某砂土,已知d10=0.2mm、d30=1.0mm、d60=1.8mm则不均匀系数为9. 0·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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64.含水量测试时,求得土中水的百分含量是自由水和部分结合水。·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©
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65.用不同方法制备土样,所得击实成果不同t最大干密度按从大到小排列是: 烘干·ÁÅCk´ÊnÐbbs.3c3t.com¢+ ßmü»©