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Pervious concrete (also called porous concrete) is one of the most promising sustainable and green building materials today. This study examined high-strength pervious concrete and ordinary-strength pervious concrete reinforced with steel fiber or glass fiber. A total of fifteen mixtures of normal- and high-strength pervious concretes with steel fi...
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... materials used in this study were Type I Portland Cement conforming to ASTM C 150 [25], produced by Taiwan Cement Company, three kinds of coarse aggregates (dimensions 3.0 mm, 3.6 mm and 4.8~9.5 mm), SF (silica fume), superplasticizer (HRWR), water, steel fibers or glass fibers and no fine aggregate. The chemical composition and specific surface area of cement and silica fume is given in Table 2. Pervious concrete is a highly porous concrete material that allows water or liquids to pass through. ...Citations
... Lee et al. [12] studied the mechanical properties of ordinary and high-strength pervious concrete using steel or glass fibers. The authors concluded that the high-strength pervious concrete specimen with 2% steel fiber content had a higher compressive strength of 52.8 MPa at 28 days. ...
On 4 March, World Engineering for Sustainable Development Day provides an opportunity to highlight what engineers and engineering have achieved in our modern world and to raise public understanding of how engineering and technology are at the heart of modern life and sustainable development [...]
... Studies have been conducted to investigate the effect of fibers on concrete, such as its mechanical properties, fatigue life, and durability, which indicate the positive effect of fibers on concrete performance [2][3][4][5]. Ahmad ([6]) indicated that polypropylene fiber improves the mechanical strength and durability of concrete (particularly tensile capacity) but decreases the flowability of concrete. The optimum dose is important, as a higher dose adversely affects strength and durability due to a lack of flowability. ...
... To calculate the fracture energy of fiber-reinforced concrete specimens, notched specimens with three different thicknesses (8, 10, and 15 cm) and widths (5, 10, and 15 cm) were manufactured based on the JCI-S-001-2003 standard [31] and loaded by three-point bend loading. The P-CMOD diagrams were obtained from the experiments, and the fracture energy of each concrete specimen was calculated by measuring the area under the curve using Equations (1) and (2). Figure 4 depicts an example of load-CMOD curves of the tested notched fiber-reinforced concrete specimens with a 0.4% fiber volume fraction with different thicknesses. ...
The most frequently used construction material in buildings is concrete exhibiting a brittle behaviour. Adding fibers to concrete can improve its ductility and mechanical properties. To this end, a laboratory study was conducted to present an experimental model for the specimens’ size effect of on macro-synthetic fiber-reinforced concrete using variations in fracture energy. Composite concrete beams with different thicknesses and widths were made and tested under mode I to obtain (1) fracture toughness, (2) fracture energy, and (3) critical stress intensity factor values. Results indicated that by increasing the thickness and the width, fracture toughness and fracture energy were enhanced. Moreover, increasing the thickness and width of the beam led to critical stress intensity factors enhancement respectively by 35.01–41.43% and 7.77–8.09%.
... Due to the highly porous structure of pervious concrete, the compressive strength and flexural strength range from 2.8 MPa to 28 MPa [8] and from 1.5 MPa to 3.2 MPa [9], respectively, values much lower than those of conventional concrete. This low strength has limited the utilisation of pervious concrete in roadways that receive excessive traffic and has led to considerable research into ways of enhancing the mechanical properties of pervious concrete [10][11][12][13]. Hence, improving its mechanical properties will lead to the wider applications of pervious concrete. ...
Pervious concrete is one of the emerging sustainable materials that has recently gained the attention of many researchers. The importance of pervious concrete mainly depends on its application and on a modern integrated approach in which it is employed to reduce the effects of flooding. The main goal of this experimental analysis is to study the significance of aggregate size and the degree of compaction on the mechanical and hydraulic properties of pervious concrete. Eleven concrete mixture proportions were investigated by controlling the constituents with different aggregate fractions. The important variables considered were the aggregate sizes, viz., 0/4 mm, 4/8 mm, and 8/16 mm, with four different degrees of compaction. The porosity of the concrete structure was obtained by the partial filling of the voids in the aggregates with cement paste. The ingredients of the pervious concrete were also varied to study their significance and to evaluate the predominant factor that controls the mechanical and hydraulic properties based on the test results. Tests were conducted to determine properties such as compacting factor, compressive strength, splitting tensile strength, abrasion resistance, porosity, and hydraulic conductivity. The study revealed that the degree of compaction was one of the critical factors governing the strength and hydraulic properties of the pervious concrete; the maximum strength and minimum hydraulic conductivity were achieved with a higher degree of compaction. The test results imply that the cement content is the predominant factor determining the fresh and tensile properties of the pervious concrete, rather than the size of the aggregates used. In addition, the results also illustrated that the highly compacted pervious concrete samples made with 4/8 mm aggregates exhibited improved abrasion resistance and strength properties, but slightly reduced hydraulic conductivity, despite the designed porosity.
... The addition of fibers also aims to increase the fracture strain capacity, control cracks, anticipate brittle properties, elevate concrete ductility and toughness, as well as develop resistance to crack opening [25][26][27]. Furthermore, the use of fibers in the HSFRC mixtures enhances durability and early-age properties, such as reducing drying shrinkage and early-age cracking [28][29][30][31][32][33][34][35]. The fiber content, as well as its type, orientation, geometry, and density, subsequently affect the mechanical properties of HSFRC [36,37]. ...
This study aimed to determine the mechanical properties and absorption of high-strength fiber-reinforced concrete (HSFRC), using sustainable natural fibers. In this analysis, two types of fibers were used, namely, ramie and abaca. Two different HSFRC mixtures were also designed, where one composition emphasized ordinary Portland cement (OPC) as a binder, and the other prioritizing calcined diatomaceous earth (CDE) as a mineral additive to replace 10% weight of OPC. Furthermore, ramie and abaca fibers were separately added to the mixtures at three different volumetric contents. Based on the results, the addition of these fibers in the concrete mixtures improved the mechanical properties of HSFRC. The improvements of compressive strength, splitting tensile strength, and flexural strength, due to the addition of ramie fiber were 18%, 17.3%, and 31.8%, respectively, while those for the addition of abaca fiber were 11.8%, 17.2%, and 38.1%, respectively. This indicated that the fibers were capable of being used as alternative materials for sustainable concrete production. The effects of ramie and abaca fibers on the absorption of HSFRC were also not significant, and their presence for the same amount of superplasticizer reduced the flow speed of fresh reinforced concrete mixtures.
