Determinación de las propiedades mecánicas, compresión y flexión, para distintas relaciones de a/c en la elaboración de hormigón permeable

Abstract

Pervious concrete is usually used in pavements to allow water infiltration in order to reduce surface runoff and avoid interruption of the water cycle. However, this material has a high void content, so its mechanical properties tend to be lower than those of traditional concrete. In the present investigation, the resistance to compression, flexion and permeability of pervious concrete was studied, to determine the influence of the w/c ratio. For which the properties of the aggregates extracted from the “Puertas del Sol” mine were determined, later the dosage was calculated for the w/c ratios of 0.35 and 0.30 using the ACI 522R-10 method, in addition to the use of 50mm polypropylene fibers and plasticizer additive. 12 cylinders (100x200) were made for each one, permeability tests were carried out according to ACI 522R-10, in addition, the compression test was carried out at 7 and 28 days according to the ASTM C39 standard. Subsequently, beams (100x100x350) were made, with 3 test pieces for each dosage for the bending test, following the ASTM C78 standard. Once the data was tabulated, comparative graphs of the properties studied were made. This allowed us to observe that the highest compressive strength was 9.70 MPa with a permeability of 0.37 cm/s, corresponding to a w/c of 0.35. Regarding bending, the tests determined that the modulus of rupture of w/c 0.35 was 1.69 MPa, double that obtained with w/c 0.30.