Development of model parameters for early-age properties and crack-width prediction of slag concretes
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All buildings and infrastructure are derived from materials that achieve functional performance. Attainment and retention of performance are important factors and depend upon understanding how materials achieve their various characteristics. In this regard, concrete, being the world’s most widely used construction material, has a rightful claim when it comes to academe, research and practice.
At a time when energy concerns and sustainability issues are high on international agendas, the role of concrete is paramount. Concrete’s versatility and global availability make it the world’s first choice in many applications, both onshore, offshore, above and below ground. It is also unique, being the only cold, mouldable, inorganic plastic that can be used on a significant engineering scale.
However, for concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed.
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A study to develop the parameters of the models for predicting the deformation characteristics of normal-strength concrete incorporating slag-blended cements at early age is presented in this paper. By comparing with the previous experimental results, it was found that the basic shrinkage and creep factor decreased significantly owing to the expansion of slag concrete during the first week of moist curing. When utilising the developed models for estimating the crack width, it was found that the initial crack width of concrete subjected to restraint drying shrinkage is reduced if the slag content level increased up to 50 and 65% in the concrete mixture. Further, slag concrete tends to have less crack width and lower number of cracks in the long term compared with that with no slag.
- Document Type: Research Article
- DOI: 10.1680/macr.2008.00092
- Affiliations:
1: RMIT University; Monash University
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