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大体积砼浇筑完毕后,应在养护期间测定砼表面和内部的温度,其拆模温度应符合设计要求或<()℃.

发布日期:2021-03-15

大体积砼浇筑完毕后,应在养护期间测定砼表面和内部的温度,其拆模温度应符合设计要求或<()℃.
A

15

B

25

C

30

试题解析

大体积混凝土

大体积混凝土,英文是concrete in mass,我国《大体积混凝土施工标准》GB50496-2018里规定:混凝土结构物实体最小几何尺寸不小于1m的大体量混凝土,或预计会因混凝土中胶凝材料水化引起的温度变化和收缩而导致有害裂缝产生的混凝土,称之为大体积混凝土。现代建筑中时常涉及到大体积混凝土施工,如高层楼房基础、大型设备基础、水利大坝等。它主要的特点就是体积大,最小断面的任何一个方向的尺寸最小为1m。它的表面系数比较小,水泥水化热释放比较集中,内部升温比较快。混凝土内外温差较大时,会使混凝土产生温度裂缝,影响结构安全和正常使用。所以必须从根本上分析它,来保证施工的质量。美国混凝土学会(ACI)规定:“任何就地浇筑的大体积混凝土,其尺寸之大,必须要求解决水化热及随之引起的体积变形问题,以最大限度减少开裂”。大体积混凝土一般在水工建筑物里常见,类似混凝土重力坝等。

中文名
大体积混凝土
别名
大体积砼
考虑指标
水热化
不宜使用
硅酸盐水泥
外文名
concrete in mass
应用领域
水工建筑物
特点
结构厚实,混凝土量大 工程复杂

面和

面和,是一个汉语词语,拼音为miàn huo,北京话,意思是某些瓜果吃在嘴里沙而又软。

中文名
面和
拼音
miàn huo

完毕

完毕,读音为wán bì,汉语词语,意思是完结、完了。

中文名
完毕
日文
终(お)わる
英文
done with
汉语拼音
wán bì

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