天興洲大橋鐵路引橋及相關配套工程大體積混凝土施工作業指導書.doc

大體積混凝土施工作業指導書
1. 總則
1.1 適用范圍
武漢天興洲大橋鐵路引橋及其相關工程配套部分TZQ-1標段內樁基承臺及墩臺大體積混凝土施工
1.2 大體積混凝土的定義
在《普通混凝土配合比設計規程》（JGJ/T55）中對大體積混凝土解釋為“混凝土結構物中實體最小尺寸大于或等于1m或易引起裂縫的混凝土”。
1.3大體積混凝土裂縫產生原因的機理分析
   混凝土中產生裂縫有多種原因，主要是溫度和濕度的變化，混凝土的脆性和不均勻性，以及結構不合理，原材料不合格（如堿骨料反應），模板變形，基礎不均勻沉降等。
    　混凝土硬化期間水泥放出大量水化熱，內部溫度不斷上升，在表面引起拉應力。后期在降溫過程中，由于受到基礎或老混凝上的約束，又會在混凝土內部出現拉應力。氣溫的
Mass Concrete Construction Work Instructions
1. General
1.1 Scope
Tianxingzhou Bridge Railway Approach and related engineering support within some TZQ-1 Lot of pile caps and substructure of massive concrete
1.2 The definition of mass concrete
In the "ordinary concrete mix design procedures" (JGJ/T55) on mass concrete as "solid concrete structure in the minimum size of greater than or equal to 1m, or apt to cause cracks in the concrete."
1.3 The causes of concrete cracks in the mechanism of
   Concrete cracks for many reasons, mainly temperature and humidity changes, brittle and uneven concrete, as well as unreasonable structure, failure of raw materials (such as alkali-aggregate reaction), template deformation, differential settlement of foundation.
    During the release of a large number of hardened concrete cement hydration heat, the internal temperature rise, causing the surface tension stress. Late in the cooling process, due to coagulation on the basis of the constraints or old, what will occur in the internal tensile stress of concrete. Temperature
 

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