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混凝土外文翻譯---淺談混凝土的施工過程中溫度與裂縫控制-其他專業(yè)-預(yù)覽頁

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【正文】 rption 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。 Discuss the construction temperature and crack of the concrete lightly The summary In order to prevent the owners of the concrete work of claims, we must do a good job in the construction process in the temperature and crack control, through observation live for many years, through consulting the monograph about stress within the concrete, explain to concrete temperature reason , onthespot concrete control and measure , prevention of crack of temperature that crack produce. Keyword Concrete Temperature stress Crack Control The concrete occupies the important position in modern engineering construction. But today, the crack of the concrete is paratively general, the cracks are nearly omnipresent in the science of bridge building. Though we take various kinds of measures in constructing, careful, but the crack still occurs now and then. Tracing it to its cause, it is one of them inpletely that our change to concrete temperature stress pays attention to. In the large volume concrete, temperature stress and temperature control are significant. This is mainly because of the reason of two respects. First of all, concrete often appear the temperature crack in not constructing, influence the globality and durability of the structure. Secondly, in the course of operating, the temperature change has remarkable influence that can39。 (3) Rational arrangement construction process, prevent the too big discrepancy in elevation and side from exposing for a long time。 關(guān)鍵詞 混凝土;溫度應(yīng)力;裂縫;控制 混凝土在現(xiàn)代工程建設(shè)中占有重要地位。 在大體積混凝土中,溫度應(yīng)力及溫度控制具有重要意義。我們遇到的主要是施工中的溫度裂縫,因此本文僅對(duì)施工中混凝土裂縫的成因和處理措施做一探討。由于彈性模量的變化,這一時(shí)期在混凝土內(nèi)形成殘余應(yīng)力。 控制溫度的措施如下: ( 1)采用改善骨料級(jí)配,用干硬性混凝土,摻混合料,加引氣劑或塑化劑等措施以減少混凝土中的水泥用量; ( 2)拌合混凝土?xí)r加水或用水將碎石冷卻以降低混凝土的澆筑溫度; ( 3)熱天澆筑混凝土?xí)r減少澆筑厚度,利用澆筑層面散熱; 為保證混凝土工程質(zhì)量,防止開裂,提高混凝土的耐久性,正確使用外加劑也是減少開裂的措施之一。 ( 2)水灰比是影響混凝土收縮的重要因素,使用減水防裂劑可使混凝土用水量減少 25%。 ( 6)混凝土在收縮時(shí)受到約束產(chǎn)生拉應(yīng)力,當(dāng)拉應(yīng)力大于混凝土抗拉強(qiáng)度時(shí)裂縫就 會(huì)產(chǎn)生。 ( 9)摻外加劑混凝土和易性好,表面易抹平,形成微膜,減少水分蒸發(fā),減少干燥收縮 。嚴(yán)格控制模板間的縫隙大小,超過 2 mm 的必須用海綿條塞縫 ,對(duì)于板面多孔的模板一律不用,同時(shí)做好墻柱爛根防治工作,采取根部貼海綿條,底部抹水泥砂漿,澆筑混凝土前,先注入同標(biāo)號(hào)的水泥砂漿由于防水混凝土結(jié)構(gòu)壁厚大多較薄,為保證構(gòu)件的幾何尺寸,常采用內(nèi)外螺栓拉接的措施,需要注意的是,應(yīng)在拉接螺栓中間設(shè)置止水鐵板,以防止水沿著螺栓滲漏,形成引水通路。 4. 3 混凝土的拌制和運(yùn)輸 由于防水混凝土要求較高的密實(shí)性,所以拌制也要有較好的均勻性,為此應(yīng)做好如下幾點(diǎn): (1)確保攪拌時(shí)間,每次攪拌從投料到出料一般不少于 2min。 (5)混凝土的澆筑采用泵送工藝,有效的避免了混凝土在運(yùn)輸過程中產(chǎn)生離析泌水及漏漿現(xiàn)象。 (3)堅(jiān)持開門子下料或用串桶 (溜槽 )下料。防水混凝土一般在垂直方向不留置施工縫,在主樓與裙樓之間設(shè)了后澆帶,垂直方向的施工縫在接縫部位設(shè)置膨脹性橡膠止水帶或鋼板止水帶。試驗(yàn)證明,防水混凝土早期脫水或養(yǎng)護(hù)過程缺水 ,將大幅度降低其
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