Performance Analysis and Admixture Optimization of GBFS-HPMC/Fiber Pervious Concrete

Abstract

Permeable pavements can decrease the volume of stormwater, thereby mitigating the risk of flooding and reducing the urban heat island effect. This study investigated the influence of incorporating granulated blast-furnace slag (GBFS), hydroxypropyl methylcellulose (HPMC), and polypropylene plastic textile fiber (PPTF) on the mechanical properties and water permeability of pervious concrete. Orthogonal tests were employed to conduct the analysis. The findings indicate that the pervious concrete with GBFS, HPMC, and PPTF (termed GBFS-HPMC/fiber pervious concrete) exhibited the highest cubic compressive strength, ultimate tensile strength, and flexural strength. These values were 25.22 MPa, 3.36 MPa, and 5.39 MPa, respectively. The standard deviations for cubic compressive strength, split tensile strength, flexural strength, water permeability coefficient, and porosity, as calculated using SPSS, were 1.57, 0.1, 1.17, 0.35, and 0.4, respectively. Scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) were used to analyze the microstructure and compositional combinations of the pervious concrete. The analyses revealed that the calcium-silicate-hydrate (C-S-H) gel, produced by GBFS hydration, enhanced the bonding within the interfacial transition zone (ITZ) and between the fibers and aggregates. Additionally, the anchoring and supporting effects of the PPTF in the matrix contributed to stabilizing the overall matrix structure. Lastly, a gray correlation analysis was applied to optimize the admixture. The findings indicate that following the optimization, the cubic compressive strength increased by 7.2%, splitting tensile strength by 2.1%, and flexural strength by 2.5%. In summary, the mechanical properties of pervious concrete improved after optimizing the admixture.

A Novel Pervious Concrete Improved by Hexagonal Boron Nitride and Basalt Fiber in Mechanical Properties, Permeability, and Micro-Mechanisms

“…Additionally, flexural strength tests were carried out using prism specimens with dimensions of 100 × 100 × 400 mm (as illustrated in Figure 3). The calculation of compressive strength and flexural strength followed the respective formulas as detailed below [27]. According to the Chinese national standard "Standard for test method of mechanical properties on ordinary concrete, GB/T 50081-2002" [28], when the size of the test specimen was a non-standard test specimen of 100 × 100 × 400 mm, it was multiplied by a size conversion factor of 0.85:…”

“…(a) (b) Porosity (P) tests were conducted employing the mass method, illustrated in Figur The permeability coefficient (Kt) was determined using the constant head method, as picted in Figure 5. The calculation of porosity and permeability coefficient followed respective formulas as detailed below [27]:…”

Performance Analysis of Ferronickel Slag-Ordinary Portland Cement Pervious Concrete

“…After the water flow stabilizes, timing is started and the time taken by the measuring cylinder to weigh 1 L of water is recorded, taking the average of three measurements as the experimental result. The formula used to calculate the permeability coefficient, k, is expressed as follows [5,31,32]:…”

Research on Statistical Characteristics and Prediction Methods of Ferronickel Slag Pervious Concrete Performance with Different Sizes of Aggregate and Mixtures

“…The interplay between performance indicators often presents a challenge, prompting researchers to focus on developing mix proportioning and predictive models that harmonize these factors [8][9][10][11]. Yan et al [12] explored the effects of adding granulated blast-furnace slag, hydroxypropyl methylcellulose, and polypropylene plastic textile fiber on the mechanical and permeability characteristics of pervious concrete. Through gray correlation analysis, the study optimized the mix, resulting in enhanced mechanical properties.…”