【正文】 采用適當較小的水膠比。 施工方面 模板的安裝及拆除、荷載大小、地基土類別、施工程序、施工工具和材料供應等條件進行設計。，并應具有足夠的剛度、強度和穩(wěn)定性，間距適度，防止支撐沉陷，引起模板變形。拆除模板及支架應隨拆隨清運，不得對樓層形成局部過大的施工荷載。當需在卸料前補摻外加劑調整混凝土拌和物的工作性時，外加劑摻入后運輸車應進行快速攪拌，攪拌時間應由實驗確定。當混凝土中摻加外加劑或采用快硬水泥時，持續(xù)時間應由實驗確定。3. 制定施工方案時應考慮工程情況和實際工作能力，使各環(huán)節(jié)的施工能力應與混凝土的一次澆筑量相適應，必要時混凝土的連續(xù)澆筑。 混凝土的養(yǎng)護1. 養(yǎng)護是防止混凝土產生裂縫的重要措施，必須充分重視，并制定養(yǎng)護方案，派專人養(yǎng)護工作。5. 截面較大的柱子，宜用濕麻袋圍裹噴水養(yǎng)護，或用塑料膜圍裹自生養(yǎng)護，也可涂刷養(yǎng)護液。除非承載力嚴重不足，不要輕易打掉重建，耗費巨資補強加固。4 混凝土裂縫的處理方法 混凝土裂縫的處理方法表面涂抹和表面貼補法表面涂抹適用范圍是漿材難以灌入的細而淺的裂縫，深度未達到鋼筋表面的發(fā)絲裂縫，不漏水的縫，不伸縮的裂縫以及不再活動的裂縫。利用壓送設備（~）將補縫漿液注入砼裂隙，達到閉塞的目的，該方法屬傳統(tǒng)方法，效果很好。 混凝土置換法是處理嚴重損壞混凝土的一種有效方法，此方法是先將損壞的混凝土剔除，然后再置換入新的混凝土或其他材料。材料選擇方面存在粗細集料含泥量過大、骨料粒徑太細、混凝土外加劑和摻和料選擇不當、水泥品種原因、水泥等級及混凝土強度等級的原因。 材料選擇從選擇合適的混凝土強度等級及水泥品種、等級和級配優(yōu)良的砂、石原材料，積極采用摻合料和混凝土外加劑等控制措施。并且在環(huán)境方面應注意施工的季節(jié)，環(huán)境的溫濕度，嚴格控制現(xiàn)場坍落度、防風、及時和氣象站保持緊密聯(lián)系。［2］何星華,［M］.北京:中國建筑工業(yè)出版社,2005.［3］韓素芳,［M］.北京:化學工業(yè)出版社,2005,12.［4］胡碩,大體積混凝土溫度裂縫控制 [D] .西安建筑科技大學,2005.［5］［M］. 北京:清華大學出版社，2002. 5.請您刪除一下內容，O(∩_∩)O謝謝?。?！Many people have the same mixed feelings when planning a trip during Golden Week. With heaps of time, the sevenday Chinese請您刪除一下內容，O(∩_∩)O謝謝?。?！National Day holiday could be the best occasion to enjoy a destination. However, it can also be the easiest way to ruin how you feel about a place and you may bee more fatigued after the holiday, due to battling the large crowds. During peak season, a dream about a place can turn to nightmare without careful planning, especially if you travel with children and older people. As most Chinese people will take the holiday to visit domestic tourist destinations, crowds and busy traffic are inevitable at most places. Also to be expected are increasing transport and acmodation prices, with the possibility that there will be no rooms available. It is also mon that you39。Nestled close to the country39。Shutterbugs flock to see for themselves the marvel of splendid colors around the mountains and waters, many of whom have travel a long distance and even camp here only to capture a moment of the nature wonder. s misery, the cow told him to turn its hide into a pair of shoes after it died. The magic shoes whisked Niulang, who carried his two children in baskets strung from a shoulder pole, off on a chase after the empress. The pursuit enraged the empress, who took her hairpin and slashed it across the sky creating the Milky Way which separated husband from wife. But all was not lost as magpies, moved by their love and devotion, formed a bridge across the Milky Way to reunite the family. Even the Jade Emperor was touched, and allowed Niulang and Zhinu to meet once a year on the seventh night of the seventh month. This is how Qixi came to be. The festival can be traced back to the Han Dynasty (206 BCAD 220). Traditionally, people would look up at the sky and find a bright star in the constellation Aquila as well as the star Vega, which are identified as Niulang and Zhinu. The two stars shine on opposite sides of the Milky Way. Customs In bygone days, Qixi was not only a special day for lovers, but also for girls. It is also known as the Begging for Skills Festival or Daughters39。s Day! in shops, hotels and restaurants. But few young women will mark the festival with their boyfriends, or take part in traditional activities to pray for cleverness.