芒果视频

混凝土行業簡介

一、混凝土的凝結時間

根據(ju)水(shui)泥(ni)(ni)的(de)(de)具體性質及混(hun)凝(ning)(ning)(ning)土(tu)(tu)所摻外加劑(ji)的(de)(de)性能(neng)不(bu)同(tong)，混(hun)凝(ning)(ning)(ning)土(tu)(tu)的(de)(de)初凝(ning)(ning)(ning)時(shi)(shi)間(jian)(jian)(jian)及終凝(ning)(ning)(ning)時(shi)(shi)間(jian)(jian)(jian)會有(you)差別。為便(bian)于(yu)(yu)施工(gong)，常態混(hun)凝(ning)(ning)(ning)土(tu)(tu)的(de)(de)初凝(ning)(ning)(ning)時(shi)(shi)間(jian)(jian)(jian)不(bu)得(de)小(xiao)(xiao)于(yu)(yu)3～4小(xiao)(xiao)時(shi)(shi)；終凝(ning)(ning)(ning)時(shi)(shi)間(jian)(jian)(jian)不(bu)得(de)大于(yu)(yu)12小(xiao)(xiao)時(shi)(shi)。一(yi)般(ban)控制在(zai)(zai)6～10小(xiao)(xiao)時(shi)(shi)。根據(ju)施工(gong)需要，選擇(ze)適合的(de)(de)外加劑(ji)，可以在(zai)(zai)一(yi)定的(de)(de)范(fan)圍(wei)內改變混(hun)凝(ning)(ning)(ning)土(tu)(tu)的(de)(de)初、終凝(ning)(ning)(ning)時(shi)(shi)間(jian)(jian)(jian)。國家標準(zhun)規定水(shui)泥(ni)(ni)初凝(ning)(ning)(ning)時(shi)(shi)間(jian)(jian)(jian)不(bu)得(de)早于(yu)(yu)45分鐘，一(yi)般(ban)為1～3小(xiao)(xiao)時(shi)(shi)；終凝(ning)(ning)(ning)時(shi)(shi)間(jian)(jian)(jian)不(bu)得(de)遲于(yu)(yu)12小(xiao)(xiao)時(shi)(shi)，一(yi)般(ban)為5～8小(xiao)(xiao)時(shi)(shi)。

二、混凝土一方多少噸

普通混凝土因為強度和等級的不同，在重量上也有一定的差異，常規的混凝土一般有C10、C15、C20、C25、C30、C35、C40等級，最高的能達到C80。以C10為例，一立方C10混凝土通常需要用到水泥100公斤，砂石780公斤，碎石1025公斤，水160公斤，摻合料220公斤，總重量2285公斤。通常混凝土的等級越高，重量約大，選擇的混凝土品牌以強度等(deng)級高為宜。

三、混凝土配合比

混(hun)(hun)(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)施(shi)工(gong)(gong)(gong)(gong)配(pei)合(he)(he)比(bi)(bi)是(shi)指混(hun)(hun)(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)中(zhong)各組成(cheng)材(cai)料之間的(de)(de)比(bi)(bi)例(li)關系，混(hun)(hun)(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)配(pei)合(he)(he)比(bi)(bi)設計是(shi)混(hun)(hun)(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)工(gong)(gong)(gong)(gong)程(cheng)中(zhong)很重(zhong)要(yao)的(de)(de)一項工(gong)(gong)(gong)(gong)作(zuo)，它直接影響(xiang)到(dao)混(hun)(hun)(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)的(de)(de)順利(li)施(shi)工(gong)(gong)(gong)(gong)、混(hun)(hun)(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)工(gong)(gong)(gong)(gong)程(cheng)的(de)(de)質量和(he)混(hun)(hun)(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)工(gong)(gong)(gong)(gong)程(cheng)的(de)(de)成(cheng)本。設計混(hun)(hun)(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)配(pei)合(he)(he)比(bi)(bi)的(de)(de)基(ji)本要(yao)求(qiu)(qiu)是(shi)滿足(zu)混(hun)(hun)(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)設計的(de)(de)強度等級、施(shi)工(gong)(gong)(gong)(gong)要(yao)求(qiu)(qiu)的(de)(de)混(hun)(hun)(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)和(he)易(yi)性(xing)、混(hun)(hun)(hun)(hun)凝(ning)(ning)(ning)土(tu)(tu)(tu)使用要(yao)求(qiu)(qiu)的(de)(de)耐久性(xing)，在滿足(zu)以上要(yao)求(qiu)(qiu)的(de)(de)基(ji)礎上降低成(cheng)本。

四、混凝土強度低怎么辦

混(hun)凝(ning)(ning)土(tu)強度低可通(tong)過提高水泥強度等(deng)級來(lai)增(zeng)大(da)混(hun)凝(ning)(ning)土(tu)強度；施工(gong)時(shi)，一般通(tong)過降低水灰比(bi)來(lai)提高混(hun)凝(ning)(ning)土(tu)強度。適當降低水灰比(bi)，可有效控制漿集比(bi)和水泥漿層厚度，使集料的骨架(jia)作用得到充分(fen)發揮(hui)，最終能增(zeng)強混(hun)凝(ning)(ning)土(tu)強度。此外，還可以通(tong)過優化設(she)計工(gong)藝流程、選擇級配優良、砂率(lv)適中的高強度碎石、采用濕熱(re)處理養護混(hun)凝(ning)(ning)土(tu)、適量添加(jia)外加(jia)劑和摻合料等(deng)方法來(lai)增(zeng)加(jia)強度。