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ASTM (2023) Standard Practice for Use of Unbonded Caps in Determination of Compressive Strength of Hardened Concrete Cylinders.

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• TITLE: Allophane as a Nanotechnological Additive in Masonry Materials to Increase Resistance and Waterproofing

  AUTHORS: Edward H. Jiménez, Joao Rivera, Juan H. Villalba, Paola E. Vera, Marlon Cuenca, Belén Granja, Javier Fuentes, Sandra Gavilanes, Daniel Hidalgo, Fernando Garcia, Jose Bermudez, Washington Ruiz, Alexis Martial Debut

  KEYWORDS: Allophane, Nano Additive, Strength, Impermeability, Concrete, Mortar

  JOURNAL NAME: Advances in Materials Physics and Chemistry, Vol.14 No.8, August 30, 2024

  ABSTRACT: The constant need for high-strength materials in the construction industry promotes the research of additives that improve the properties of masonry materials. The use of allophane as an additive in concrete and mortar mixtures was implemented to improve their strength and waterproofing, respectively, using compression and water absorption tests according to their corresponding standards (ASTM C1231, ASTM D2938, and ASTM C1585). The samples were evaluated at different concentrations and curing ages. In addition, different sand/cement ratios were considered for the mortar. The results revealed that there was a 9.4% increase in compressive strength in concrete and a 23.7% reduction in water absorption in mortar for the 5:1 ratio. These changes would be the result of the interaction of the nanoporous additive in the atomic crystal structure of the material demonstrating the nanotechnological nature of allophane.