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高強高性能混凝土

中博建設工程集團有限公司   地址:浙江省溫嶺市城東街道萬昌中路806號青商大廈18樓 電話:0576-8601 1256   傳真:0576-8601 1256   E-MAIL:master@zbjt.cn

中博建設工程集團有限公司

高強高性能混凝土

分類:
科技園地
發布時間:
2010/09/25
瀏覽量
  本節高強高性能混凝土(簡稱HS-HPC)是強度等級超過C80的HPC,其特點是具有更高的強度和耐久性,用于超高層建筑底層柱和梁,與普通混凝土結構具有相同的配筋率,可以顯著地縮小結構斷面,增大使用面積和空間,并達到更高的耐久性。
  1、主要技術內容
  HS-HPC的水膠比≤28%,用水量≥200kg/m3,膠凝材料用量650~700kg/m3,其中水泥用量450~500kg/m3,硅粉及礦物微細粉用量150~200kg/m3,粗骨料用量900~950kg/m3,細骨料用量750~800kg/m3,采用聚羧酸高效減水劑或氨基磺酸高效減水劑。HS-HPC用于鋼筋混凝土結構還需要摻入體積含量2.0~2.5%的纖維,如聚丙烯纖維、鋼纖維等。
  2、技術指標
  1)工作性:新拌HS-HPC混凝土的工作性直接影響該混凝土的施工性能。其最主要的特點是粘度大,流動性慢,不利于超高泵送施工。
  混凝土拌合物的技術指標主要是坍落度、擴展度和倒坍落度筒混凝土流下時間(簡稱倒筒時間),坍落度≥240mm,擴展度≥600mm,倒筒時間≤10s,同時不得有離析泌水現象。
  2)HS-HPC的配比設計強度應符合以下公式:
  3)HS-HPC應具有更高的耐久性,因其內部結構密實,孔結構更加合理。
  的抗凍性、碳化等方面的耐久性可以免檢,如按照《高性能混凝土應用技術規程》CECS207標準檢驗,導電量應在500庫侖以下;為滿足抗硫酸鹽腐蝕性應選擇低C3A含量(<5%)的水泥;如存在潛在堿骨料反應的情況下,應選擇非堿活性骨料。
  4)HS-HPC自收縮及其控制自收縮與對策當HS-HPC澆筑成型并處于密閉條件下,到初凝之后,由于水泥繼續水化,吸取毛細管中的水分,使毛細管失水,產生毛細管張力,如果此張力大于該時的混凝土抗拉強度,混凝土將發生開裂,稱之自收縮開裂。水灰比越低,自收縮會越嚴重。
  一般可以控制粗細骨料的總量不要過低,膠凝材料的總量不要過高;通過摻加鋼纖維可以補償其韌性損失,但在侵蝕環境中,鋼纖維不適用;需要摻入有機纖維,如聚丙烯纖維或其他纖維;采用外摻5%飽水超細沸石粉的方法,以及充分地養護等技術措施可以有效的控制HS-HPC的自收縮和自收縮開裂。
  自收縮的測定方法參照《普通混凝土長期性能和耐久性能試驗方法標準》GB/T50082和中國工程建設標準化協會標準《高性能混凝土應用技術規程》CECS207進行。
  的早期開裂、自收縮開裂及長期開裂的總寬度要低于0.2mm。普通混凝土的應變達到3‰時,其承載能力仍保持一半以上。若HS-HPC的應變也處于3‰時,實際承載力已近于0,這就意味著在這種情況下,在HS-HPC中只觀察到裂縫形成,然后是迅速的破壞。
  3、適用范圍
  適用于對混凝土強度要求較高的結構工程。
  4、已應用的典型工程
  國內廣州珠江新城西塔項目工程已大量應用HS-HPC,國外超高層建筑及大跨度橋梁也大量應用了HS-HPC。
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