Influence of Maximum Nominal Coarse Aggregate Size on Air Entrapment in 210 kgf/cm2 Concrete Mixes

Riveros R.C.D.; Carranza S.C.T.; Calderón B.A.C.; Pintado W.R.; Ojeda J.M.P.; Cruz M.M.T. · Annales de Chimie: Science des Materiaux (2025) · DOI: 10.18280/acsm.490510

Resumen

This study analyzed the variation of the percentage of entrapped air as a function of nominal maximum aggregate size (TMN) in concrete mix designs for the city of Jaén-Peru. A quantitative approach was employed, incorporating a basic methodology, experimental design, and inductive reasoning. Concrete mixtures were designed using the ACI 211 method, with a target compressive strength of 210 kgf/cm2. A total of 36 specimens were prepared for the study, with six specimens prepared for each of the following NMAS sizes: 3/8", 1/2", 3/4", 1", 1 ½", and 2". In the fresh state, parameters such as entrapped air content, slump, unit weight, and temperature were measured, while in the hardened state, compressive strength was evaluated. The results indicated mean entrapped air contents of 2.78%, 2.30%, 1.78%, 1.50%, 1.00%, and 0.45%, respectively, for NMAS of 3/8", 1/2", 3/4", 1", 1 ½", and 2". It was concluded that for TMN of 3/8", 1/2", 3/4", and 2”, the trapped air content deviates from the design assumptions. On the contrary, for 1" and 1 1/2" NMAS, the values are in line with those expected in the mix design.

Instituciones: Universidad Nacional de Jaén; Universidad Nacional Intercultural Fabiola Salazar Leguía de Bagua