PSI - Issue 66

Jonathan Duarte Oliveira et al. / Procedia Structural Integrity 66 (2024) 313–319 Author name / Structural Integrity Procedia 00 (2025) 000 – 000

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Pervious concrete is characterized by a porous structure and composed by coarse aggregates and a small layer of cement paste (Shan et al. (2022)). Although the high amount of voids results in a significant reduction of mechanical strength, the use of pervious concrete provides a wide range of benefits, such as rainwater purification, reduction of the urban heat island effect, reduction of noise pollution, and water drainage management (Khankhaje et al. (2023); Vujovic et al. (2021); Rodrigues et al. (2022)). By using a cement-to-aggregate ratio of 1:3.2 and a water-to-cement ratio of 0.30, with aggregate having a grain size ranging between 10-12.5 mm and applying a light compaction in order to avoid significant obstruction of the specimen pores, Chockalingam et al. (2023) obtained the following values: a compressive strength of 5.4 MPa and 4.8 MPa by using cubic and cylindrical specimens, respectively, a tensile strength of 0.8 MPa and a flexural strength of 1.9 MPa. Oliveira and Costa (2024) used a cement-to-aggregate ratio of 1:4 and a water-to-cement ratio of 0.26, compacted the material with a roller in one layer, obtaining a compressive strength of 6.5 MPa. In this work, the compressive strength of a specific mixture of pervious concrete is investigated both experimentally and numerically. A version of the Lattice Discrete Element Method (LDEM) is employed to numerically simulate the mechanical behaviour under compression of the above mixture. For the input data and the calibration of the model, experimental data related to indirect tensile and four-point bending tests are used. 2. Physical and mechanical characterization of the investigated pervious concrete In this Section, the physical and mechanical characterisation of the investigated materials is presented. 2.1. Materials and mixture Basalt crushed stones 0, purchased in the city of Alegrete/RS, is used as the coarse aggregate. This aggregate has a maximum value of the nominal diameter equal to 9.5 mm and a fineness modulus equal to 5.78, according to the NBR 17054 (2022) standard. The crushed stone particles have different size and shape, as shown in Figure 1(a). The granulometric curve of the aggregate is shown in Figure 1(b), together with the limits prescribed by the NBR 7211 (2022) standard. The density and water absorption, obtained according to the NBR 16917 (2021) standard, are equal to 2.78 g/cm³ and 2.38%, respectively. The cement is a CP V-ARI Portland cement, with a density of 3.01 g/cm³ and an average compressive strength of 39.1 MPa (at 28 days), according to the NBR 7215 (2019) standard.

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Coarse aggregate Limits NBR 7211 (2022)

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Fig. 1. (a) Coarse aggregate particles (crushed stone 0) and (b) granulometric curve of the coarse aggregate, where the limits prescribed by the NBR 7211 (2022) standard are also reported. The V-MAR® VSC500 (GCP AT (2024)) additive is used, in a quantity equal to 700 ml/100 kg of cement.