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    鐵路高性能混凝土施工技術探討
    摘要:在鐵路的建設施工過程中,為了保證運輸的安全,對于客運專線的鐵路施工具有較高的要求,在其施工的過程中通常采用的是高性能的混凝土材料來進行施工,本文將結合高性能混凝土的特點,對其施工應該注意的施工要點及施工技術予以分析探討。
      關鍵詞:高性能混凝土;施工技術;探討
      在鐵路施工的要求中,要求必須使用耐久性能強的材料來進行鐵路的施工建設,同時還要能夠滿足環境保護的需要,而高性能混凝土的特點正好符合鐵路建設的技術需要,隨著鐵路建設的發展,高性能混凝材料已經發展成為鐵路建設過程中所必須的材料,在鐵路高性能混凝土施工技術中,對高性能混凝土的原材料、配合比、施工中的操作及后期的養護都有具體的技術要求,本文將就以上幾點對鐵路高性能混凝土施工技術予以分析。
      一、高性能混凝土的介紹
      高性能混凝土是一種新型的混凝土,在其制作的過程中,采用了現代化的混凝土制作技術,與普通的混凝土材料相比,高性能混凝土材料具有較高的抗滲透能力,其具有較強的耐久性能,一般情況下,高性能混凝土材料具有很長的使用壽命,并且具有很好的體積穩定性及工作性能,在硬化的后期高性能混凝土的收縮變形是非常小的。
      二、高性能混凝土的原材料技術要求
      1、水泥的品質指標
      高性能混凝土的水泥的品質要能夠符合gb1999中的有關規定,水泥應該采用品質相對穩定,強度等級大于等于425級的硅酸鹽水泥,水泥中的堿的含量應該小于0.6%,每千克水泥的比表面積不能超過350平方米,水泥熟料中的c3a的含量應該低于8%。www.zhidachem.com
      2、礦物摻和料的品質指標
      其中磨細礦渣粉應該選擇來源固定、性能穩定均勻的產品,其主要的參數指標如表1所示。
      粉煤灰的主要的品質指標如表2所示。
      3、拌和水的品質指標
      在選用拌和水的過程中,要能夠滿足相應的國家標準,不能采用海水,可以采用符合國家相關標準的生活飲用水,用拌和水進行水凝初凝及終凝的實驗,并采用蒸餾水進行實驗,涼席實驗所得的初凝及終凝的時間相差應該小于半個小時,并且初、終凝的時間應該能夠滿足國家有關的規定。
      4、細骨粉的品質指標
      細骨料的選擇過程中,嚴禁使用海砂,不能選用山砂、機制砂,應該選用質地均勻、級配合理、堅固的天然中粗的河砂,較為適宜的細度模數應該為2.6~3.0。
      5、粗骨粉的品質指標
      粗骨粉最適宜的選材是選擇質地均勻堅固、級配合理的碎石,不能采用砂巖的碎石,也可以選用卵石或碎卵石,粗骨料的最大的公稱粒徑應該小于等于31.5mm,不能超過鋼筋的最小間距的四分之三,不能超過鋼筋保護層厚度的三分之二。
      6、專用復合外加劑的品質指標
      專用復合外加劑應該具有能與水泥進行良好的適應、對混凝土的耐久性有明顯的改善、對混凝土孔的結構有明顯的細化作用、能夠進行適量的引氣、減水率高等諸多優點,專用復合外加劑的相關技術參數必須要經過嚴格的檢驗。
      三、高性能混凝土的配合比設計
      高性能混凝土在混合的過程中使用的原材料的種類較多,對配合的技術要求較高,目前關于高性能混凝土配合比的設計并沒有一種統一的計算方法,本次研究中采用的主要的計算步驟是,先對空白的混凝土的初步配合比進行計算,然后依據經驗對細摻料及外加劑的摻量進行確定,然后根據抗裂性對比實驗、流動性實驗等對基準的配合比進行確定,要確定出實驗室理論的合理的配合比,還要通過耐久性實驗等對強度等數據進行調整,最后再通過相應的換算計算出適用于本次施工的配合比。
      四、鐵路高性能混凝土施工中的技術要求
      4.1 施工前的準備
      在開始鐵路高性能混凝土施工之前,要對整個施工過程進行全面的考慮,制定出可靠的施工方案,同時應該為工程質量制定出詳細的治療標準及技術規范,高性能混凝土的施工,在不同的季節、不同的環境中,對施工工藝有著不同的要求,在施工之前應該對各種因素進行綜合的考慮。
      4.2 原材料的儲存
      鐵路高性能混凝土的施工過程中,原材料的質量對整個工程的質量都有著重要的影響,原材料的采購過程中,要對原材料的數量、規格、品質等進行嚴格的把關,檢驗合格的原材料才能在工程中應用,對原材料進行存儲時,要根據原材料的種類、用途等進行分類存儲。
      4.3

    凝土的澆筑
      在開始混凝土的澆筑工作之前,要根據所要施工的鐵路所處的環境及施工條件等,選擇合理的澆筑方案,對鋼筋保護層墊塊的緊固程度、數量、位置等進行檢查,澆筑過程中的傾落高度應該小于兩米,澆筑過程中的時間間隙應該小于一個半小時,澆筑完成后要采取必要的降溫防裂措施。
      五、鐵路高性能混凝土施工后期的養護技術
      將浸泡飽和的多孔陶粒等輕質材料加入到混凝土當中,能夠對高性能混凝土材料的自收縮性起到很好的抑制作用,可以采用帶摸供水養護的內襯憎水塑料鋼模板來進行高性能混凝土材料的養護,多孔材料能夠吸收大量的水份,能夠起到一定的養護作用。
      結束語
      高性能混凝土材料是鐵路建設的過程中不可或缺的材料,在鐵路高性能混凝土材料的施工過程中,要能夠從源頭上把關,對混凝土材料的原材料的質量進行嚴格的控制,同時做好配合比的設計工作,注意施工中的技術要點,并做好高性能混凝土施工后的養護工作。
      參考文獻:
      [1]吳志宏.客運專線鐵路高性能混凝土施工技術[j].鐵道建筑技術,2009(s1).
      [2]劉大偉.鐵路高性能混凝土施工技術探討[j].科技資訊,2010(32).
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  •  更新時間:2014-07-17 20:00:58  作者:佚名 [標簽: 高性能 混凝土 施工技術 ]
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