建筑施工混凝土裂縫的主要種類外文翻譯-建筑結(jié)構(gòu)-全文預(yù)覽
【正文】 專業(yè)：土木工程 姓名：馬偉 學(xué)號(hào)： 090320615 2 建筑施工混凝土裂縫 的主要種類 干縮裂縫 干縮裂縫多出現(xiàn)在混凝土養(yǎng)護(hù)結(jié)束后的一段時(shí)間或是混凝土澆筑完畢后的一周左右。相對濕度越低，水泥漿體干縮越大，干縮裂縫越易產(chǎn)生。 塑性收縮裂縫 塑性收縮是指混凝土在凝結(jié)之前，表面因失水較快而產(chǎn)生的收縮。 沉陷裂縫 沉陷裂縫的產(chǎn)生是由于結(jié)構(gòu)地基土質(zhì)不勻、松軟或回填土不實(shí)或浸水而造成不均勻沉降所致；或者因?yàn)槟０鍎偠炔蛔悖０逯伍g距過大或支撐底部松動(dòng)等導(dǎo)致，特別是在冬季，模板支撐在凍土上，凍土化凍后產(chǎn)生不均勻沉降，致使混凝土結(jié)構(gòu)產(chǎn)生裂縫。裂縫寬度受溫度變化的影響較小。由于混凝土的體積較大，大量的水化熱聚積在混凝土內(nèi)部而不易散發(fā)，導(dǎo)致內(nèi)部溫度急劇上升，而混凝土表面散熱較快，這樣就形成內(nèi)外的較大溫差，較大的溫差造成內(nèi)部與外部熱脹冷縮的程度不同，使混凝土表面產(chǎn)生一定的拉應(yīng)力。裂縫寬度大小不一，受溫度變化影響較為明顯，冬季較寬，夏季較窄。 混凝土拌和后會(huì) 產(chǎn)生一些堿性離子，這些離子與某些活性骨料產(chǎn)生化學(xué)反應(yīng)并吸收周圍環(huán)境中的水而體積增大，造成混凝土酥松、膨脹開裂。三是選用合適的摻和料抑制堿骨料反應(yīng)。三是混凝土澆注要振搗密實(shí)。t Suo crack of the creation be main is because of concrete inside outside humidity evaporate degree dissimilarity but cause to transform dissimilarity of result:The concrete is subjected to exterior condition of influence, surface humidity loss lead quick, transform bigger, inner part degree of humidity variety smaller transform smaller, bigger surface stem the Suo transform to be subjected to concrete inner part control, creation more big pull should dint but creation relative humidity is more low, cement syrup body stem Suo more big, stem the Suo crack be more easy the Suo crack is much surface parallel lines form or the shallow thin crack, width many between mm, the flat surface part much see in the big physical volume concrete and follow it more in thinner beam plank short to Suo crack usually the anti Shen of influence concrete, cause the durable of the rust eclipse influence concrete of reinforcing bar, under the function of the water pressure dint would creation the water power split crack influence concrete of loading dint etc..Concrete stem the Suo be main with water ash of the concrete ratio, the dosage of the position, cement of cement, gather to anticipate of the dosage of the property and dosage, in addition etc. relevant. Su constringency crack Su constringency is the concrete is before condense, surface because of lose water quicker but creation of Su constringency crack is general at dry heat or strong wind the weather appear, crack39。s 45 176。s anticipating the crack that
畢業(yè)設(shè)計(jì)相關(guān)推薦
鄂ICP備17016276號(hào)-1