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PLASTIC SHRINKAGE CRACKS ANALYZED FROM A DIFFERENT PERSPECTIVE
| 题名： | PLASTIC SHRINKAGE CRACKS ANALYZED FROM A DIFFERENT PERSPECTIVE |
| 正文语种： | eng |
| 作者： | DHRUBJYOTI BHATTACHARYA;AMITABHA DATTA |
| 作者单位： | STUP Consultants Pvt. Ltd. Kolkata;STUP Consultants Pvt. Ltd. Kolkata |
| 摘要： | Cracks in green concrete are very common phenomenon and it is observed on surface of concrete very often. In fact these types of cracks, of shallow depth, owing to dehydration, are called as "Plastic Shrinkage Cracks" or conventionally "Surface Shrinkage Crack". During Plastic Shrinkage in concrete, formation of cracks of'shallow depth' is not the only category; Plastic Shrinkage Cracks may also occur of'deep depth' in concrete. Discussions in this paper are mainly on this "Plastic Shrinkage Crack" of two categories. "Plastic Shrinkage Cracks" occurs only prior to hardening of concrete, that is, generally shrinkage cracks form in concrete at its plastic state that is in Green stage, only. Plastic Shrinkage cracks are very commonly known as 'Surface Shrinkage Cracks of shallow depth'. It is true that major percentage of surface cracks is limited to surface of the concrete only. While, concrete in roof slab or deck slab, where depth of concrete are not much, probability of formation of crack shall also be of shallow in depth. Besides these "surface crack", plastic shrinkage may create even deep cracks owing to excess bleeding in concrete. If the concrete is for large and bigger depth RCC Structure, the simple surface shrinkage cracks, as expressed above, may occur on the top surface. But probability of deep crack formation also remains in concrete in the last layer of pour (of concrete) depth, which may even be up to one meter from top. This deep Plastic Shrinkage crack is non-conventional, but it occurs in certain cases at site. Mainly based on the said two categories of Plastic Shrinkage Cracks, discussions have been made in this Paper. Identifications of the cracks, its nature and consequently its effect on the structure are the main subject of this Paper. Comparison of the plastic shrinkage cracks of the two categories is also stated herein later to avoid any confusions, so that identification of the specific crack becomes convenient. |
| 出版年： | 2022 |
| 期刊名称： | Indian Highways |
| 卷： | 50 |
| 期： | 5 |
| 页码： | 49-55 |
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