混凝土坝温控措施有哪些?
①减热
a、减少每立方米砼的水泥用量;
b、采用低热水泥。
②降温
a、合理安排浇筑时间，春秋季多浇，夏季早晚浇，正午不浇;
b、采用加冰或冰水抖和;
c、对骨料进行预冷。
③散热
a、自然散热(减少浇筑尺寸)
b、在砼内部预埋冷却水管：一期冷却降低内部最高升温值;二期冷却使最高温度尽快降低到稳定温度。
暂无解析
HenryJames’famegenerallyrestsuponhisnovelsandstorieswiththe()theme.
WhichofthefollowingisNOToneofthemainsourcesofnewwordsinthepresent-dayEnglishvocabulary?
Shesat________thetableintherestaurant.
“I________goouttoday.IfIdo,I________inastorm.fwhenIheardtheweathermansay”Isaidtomyseltherewouldbeaheavyrainthatday.
Youngerchildrenarecurious________howthingswork，andmanyofthemwanttotakeaparteverythingwithintheirreach.
