How can shrinkage cracking in geopolymer concrete with heavy-weight waste be controlled?
Shrinkage cracking in geopolymer concrete (GC) is generally influenced by raw material characteristics, activating agent, mixing ratios, and curing conditions. The chemical composition, particle size distribution and reactivity of the raw materials are key factors in the shrinkage behavior of the final GC. By carefully considering these factors, you can effectively manage and control the shrinkage of your GC. In addition, the type and concentration of the activating agent used also has an impact on drying shrinkage. Using Na-activating agent improves the drying shrinkage of GC, and results in higher durability compared to K-activator. However, if the activator concentration is too high, the degree of polymerization would be too great and the gel content would be too high, resulting in more obvious and severe shrinkage cracks. Mixing ratios are also important, especially the Liquid/Solid (L/S) ratio. It is essential that the water content of the geopolymer mixture can be controlled to adjust for thermal deformation. For example, fly ash-based GC require less water content than metakaolin-based GC during processing, as fly ash-based GC is easier to adjust for thermal deformation. However, excess water is not involved in geopolymerization and evaporates in the condensation and curing process, leading to severe shrinkage cracks. Moreover, curing conditions (temperature, curing time, and humidity) are crucial variables for the quality of GC. It is therefore important to find optimum curing conditions that promote good hydration and reduce the rapid water evaporation, thus reducing the risk of drying shrinkage in GC. Overall, if you understand and control these factors, you'll be able to produce GC with minimal shrinkage cracking.
Thank you very much. I agree with your analysis, while surface cracking starts to appear on the shrinkage samples after 6 hours of heat curing. So, I will try to address all the factors mentioned to decrease or avoid these cracks.
There are very types of waste that you will be activated whenever in inveromental
This paper might help you a lot in your research:
Article Properties of alkali-activated slag mortar and prediction of...
Laying solid foundations, in addition to installing materials that are resistant to the stress exerted by the waste, must be chosen in a way that suits the desired goal.
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