混凝土外文翻譯---淺談混凝土的施工過(guò)程中溫度與裂縫控制-其他專業(yè)(存儲(chǔ)版)
【正文】 mic and social benefits. Method being under construction Fabrication and Installation According to the concrett of closely knit , demand of reason why to form board since the waterproof also concrete have made and have assembled corresponding rise is special , be to require that not leaving out thick fluid , firm closely knit block of wood deformation , water absorption Character should be small and ought to give priority to select and using bamboo slab rubber form board or the steel form. Strict control form board room gap size, necessary exceeding 2 mms uses foam rubber or plastic to squeeze a crack in , porous form board nonutility without exception to board face Be ready for wall post at the same time rotting the prevention and cure job Adopt the cement mortar pouring same ,indicia in before the root segment sticking the foam rubber or plastic strip , the bottom puts on a cement mortar , concrete a concrete, first 5 cm ~ 10 cm. Since waterproof, concrete structure wall thickness is mostly more infertile .Be to ensure that ponent geometry dimension , Chang adopt the inside and outside bolt to pull the measure meeting attention to, responds to on play receive bolt centre interpose stop water iron plate, to prevent water from forming pilotage passage along bolt leakage. Assembing reinforoement Waterproof concrete structure has demanding as follows to the reinforced bar. (1) reinforced bar should adopt twisted steel as far as possible , increases by hold wrap a force posing in reply a water ability. (2) reinforced bars connect should try one39。這主要是由于兩方面的原因。 （ 2）中期：自水泥放熱作用基本結(jié)束時(shí)起至混凝土冷卻到穩(wěn)定溫度時(shí)止，這個(gè)時(shí)期中，溫度應(yīng)力主要是由于混凝土的冷卻及外界氣溫變化所引起，這些應(yīng)力與早期形成的殘余應(yīng)力相疊加，在此期間混凝上的彈性模量變化不大。 （ 3）水泥用量也是混凝土收縮率的重要因素，摻加減水防裂劑的混凝土在保持混凝土強(qiáng)度的條件下可減少 15％的水泥用量，其體積用增加骨料用量來(lái)補(bǔ)充。 許多外加劑都有緩凝、增加和易性、改善塑性的功能，我們?cè)诠こ虒?shí)踐中應(yīng)多進(jìn)行這方面的實(shí)驗(yàn)對(duì)比和研究，比單純的靠改善外部條件，可能會(huì)更加簡(jiǎn)捷、經(jīng)濟(jì)。 (2)當(dāng)使用外加劑，應(yīng)將外加劑制成一定濃度的溶液后加入攪拌機(jī)內(nèi)，不得將外加劑的干粉或高濃度溶液直接加入攪拌機(jī)內(nèi)，防止攪拌不均勻而局部集中，既失去外加劑作用 ， 又 影響混凝土質(zhì)量。 (4)混凝土的振搗是保證混凝土密實(shí)、防滲的重要一環(huán)，點(diǎn)定量均勻下料的基礎(chǔ)上，也應(yīng)采取定點(diǎn)振搗，精心操作注意上下層的銜接，既要防止漏振、欠振，又要防止過(guò)振，特別要禁止用撬動(dòng)鋼筋或振動(dòng)鋼筋來(lái)助振的方法，這樣將使前面已澆筑振實(shí)部分的鋼筋與混凝土分離，造成嚴(yán)重后果。防水混凝土養(yǎng)護(hù)應(yīng)不少于 14d 防水混凝土拆模要求也比較高，拆模時(shí)間不宜過(guò)早 ，拆模時(shí)應(yīng)精心操作，防止用鐵棍撬，大錘猛敲硬撬 ，使混凝土遭到破壞。 4． 6 混凝土的養(yǎng)護(hù)與拆模 防水混凝土澆筑后養(yǎng)護(hù)工作的好壞，不僅 影響到混凝土的強(qiáng)度 ，而且影響到混凝土的抗?jié)B性能。根據(jù)分層澆筑高度和運(yùn)輸工具的車容量，嚴(yán)格進(jìn)行定點(diǎn)定量方可下料，這是提高 防水混凝土澆 筑質(zhì)量的重要一環(huán)。 (3)嚴(yán)格控制鋼筋保護(hù)層厚度。 （ 8）摻減水防裂劑后混凝土緩凝時(shí)間適當(dāng)，在有效防止水泥迅速水化放熱基礎(chǔ)上，避免因水泥長(zhǎng)期不凝而帶來(lái)的塑性收縮增加。這個(gè)表面張力理論早在六十年代就已被國(guó)際上所確認(rèn)。這個(gè)階段的兩個(gè)特征，一是水泥放出大量的水化熱，二是混凝上彈性模量的急劇變化。究其原因，我們對(duì)混凝土溫度應(yīng)力的變化注意不夠是其中之一 。 (2) Prevent the foundation from rising and falling too big。s best to adopt to solder connection , stop using and being needless to bind connection to the full. (3) when binding a reinforced bar, the iron wire head responds to inner bending. (4) strict control reinforced bars protective layer thickness. The concrete stirring and mixing makes and transports Since the waterproof concrete requires that higher closely knit , reason why stir and mix system also need to have the fairly good homogeneity , should be ready for burning as follows almost for this purpose. (1) ensures that mixing time , mixing at every time are secondary jump into a expect the general ejection of pact block of wood less than 2 mins. (2) should use the apposition agent , the solution queen who should manufacture certain thickness from apposition agent adds the mixer inner, the dried powder or high concentration solution will add an agent extra not to adds the mixer inner directly ,prevent from mixing is uneven but part concentrates, both lose the apposition agent effect, and affect concrete mass. (3) responds to the assured source of life degree having a spot test on
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