Low-carbon concrete using local industrial by-products
Micro fillers are important components in concrete mix in modern concrete technology. It improves workability of concrete mix, allows to achieve cement economy and to provide special performance of hardened concrete characteristics. The most effective micro fillers have pozzolanic action. Natural pozzolanic admixtures are not available in the most of countries (for example, in Latvia), but commercial products (such as silica fume) are quite expensive. Possibilities for use of local industrial by-products are discussed in this study. One revised direction is recycled bore silicate glass powder obtained from fluorescent lamp utilization. Based on practical experiments it is proved that roughly ground glass powder affects as passive micro-filler, but additionally ground one demonstrates properties of active micro filler which performs long-term hardening effect. Up to 20% of cement may be replaced by specially prepared glass material, providing the same mechanical strength of concrete and improving durability factor. Other revised direction is concrete sawing waste remaining in pre cast concrete plants. Sawing sludge paste contains 70% water and 30% dust concrete particles. Experimental results indicate that it is possible to find the optimum dosage of sludge, which ensures the required performance characteristics of concrete. The results of research help to select the most effective way to utilize concrete sawing waste, with due account of economical and ecological aspects. Questions of energetic effectiveness of concrete containing recycled micro fillers are discussed, taking into account cement partial replacing by waste material and environmental benefit based on waste rational application. It is proved that recycled micro fillers may be regarded as an instrument for reducing cement content and minimizing carbon dioxide emission.
Source (book)
Proceedings of the 8th International Conference : Concrete in the Low Carbon Era, 9-11 July, 2012, Dundee, United Kingdom
Dundee : University of Dundee , 2012
p. 978-988
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Creation 20.11.2018
Last edited 22.08.2023
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