https://doi.org/10.1140/epjp/s13360-024-05539-8
Regular Article
Unveiling the potential of viscosity-modifying amylopectin for enhancing hydraulic lime mortar performance
Department of Civil Engineering, College of Engineering and Technology, SRM Institute of Science and Technology, 603 203, Kattakulathur, India
Received:
14
March
2024
Accepted:
6
August
2024
Published online:
17
August
2024
Additives that change the rheology of lime mortars include starches and starch derivatives that act as viscosity-modifying agents. Amylopectin extracted from potatoes, a long-chain hydrophilic polymer with a high molecular weight that tended to agglomerate, was used as an additive in natural hydraulic lime mortars. The study focuses on how the addition of starch affects the rheology and characteristics of a hardened lime matrix. The study demonstrates that the addition of amylopectin results in a shear-thinning behavior of the lime mortar, improving its workability under shear conditions. The findings demonstrate that the hydraulic lime mortar's amylopectin content increases its elastic properties, directly bearing on its consistency. Calcium starch complexes are formed, which increases the workability of lime mortar and cohesiveness and reduces shrinkage cracks, which makes the material less prone to weathering agent infiltration. Amylopectin increases the hydrophobic properties of modified NHL mortar by creating a barrier impervious to water. The amylopectin develops a thin coating that covers the binder grains uniformly over the mortar's structure, which reduces pore connectivity and restricts water flow. The pores in the modified specimen were blocked by the molecules in the amylopectin, which offered resistance to permeability. The authors of this paper believe that due to the changes it had on the porous structure of lime mortars, a viscosity-modifying admixture based on potato starch could diminish mechanical strength in the short term while increasing durability.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.