Effect of oil palm shell treatment on the physical and mechanical properties of lightweight concrete

Int J Applied Ceramic Tech

Lin

et al. 2019

In order to effectively utilize industrial solid wastes (ISW), an eco-friendly permeable brick was successfully prepared by using quartz sand-tailing and steel slag. The influence of sintering temperature on the properties including permeability, apparent porosity, water absorption, bulk density, mechanical strengths, and chemical stability was systematically investigated. The research results show that with increasing sintering temperature, the structure of the permeable brick gradually become dense, which may be due to liquid phase sintering caused by a small amount of glass-liquid phase (Ca-Fe-Si-Al-O glass system). The permeability, apparent porosity, and water absorption decrease gradually, while the bulk density and mechanical strengths increase monotonously. Furthermore, the best sintering schedule for the permeable brick is 1320°C for 1 hour, with the optimized parameters, the permeable brick exhibits excellent properties (permeability, 3.65 × 10 −2 cm/s; compressive strength, 34.1 MPa; bending strength, 5.2 MPa; chemical stability, above 99%), wherein the permeability is far beyond Chinese standard (1 × 10 −2 cm/s). The permeable brick in this work provides a promising way for the recycle of ISW. Even better, it can maximize the introduction of quartz sand-tailing and steel slag (reach 100%) and create huge economic benefits while protecting environment. K E Y W O R D S mechanical strengths, permeability, permeable brick, quartz sand-tailing, steel slag How to cite this article: Liu J, Li C, Lin C, et al. Use of steel slag and quartz sand-tailing for the preparation of an eco-friendly permeable brick.

Section: Resultssupporting

confidence: 81%

Use of steel slag and quartz sand‐tailing for the preparation of an eco‐friendly permeable brick

Int J Applied Ceramic Tech

Lin

et al. 2019

“…It is found that both the T A B L E 2 Permeability (K), apparent porosity (ε), water absorption (W), water retention (WR), bulk density (ρ), compressive strength (σ c ), bending strength (σ b ) and chemical stability (η permeability and apparent porosity show decreasing trends with increasing sintering temperature. [39][40][41] Our results in Table 2 are also consistent with the relationship. Moreover, a number of references have reported that the relationship between permeability and apparent porosity in porous materials is consistent with some predictive models.…”

Section: F I G U R Esupporting

confidence: 88%

“…On the other hand, many references have found that both the apparent porosity and water absorption were opposite to the bulk density. [39][40][41] Our results in Table 2 are also consistent with the relationship. An explanation of the relationship could be given as that the decrease in pores causes the compactness of the SSPB to increase, correspondingly, the bulk density increases.…”

Section: F I G U R Esupporting

confidence: 88%

An eco‐friendly permeable brick with excellent permeability and high strength derived from steel slag wastes

Lin

Int J Applied Ceramic Tech

et al. 2019

Utilisation of industrial solid wastes to prepare products with high added value is an effective way that could relieve environmental pollution and create huge economic benefits. In this work, steel slag based permeable brick (SSPB) was successfully prepared by liquid phase sintering. The BSE-EDS results indicate that the microstructure of the SSPB becomes dense because of the formation of a small amount of glass-liquid phase (Na-K-Ca-Fe-Si-O glass system). The effect of sintering temperature on various properties of the SSPB was systematically studied. It is found that as the sintering temperature increases from 1210 to 1300°C, the permeability deceases gradually, as well as the apparent porosity, water retention and water absorption.In contrast, the bulk density and mechanical strengths show gradually increasing trends. Most important of all, the SSPB sintered at 1270°C for 1 hour shows an excellent permeability (5.70 × 10 −2 cm/s) and high mechanical strengths (compressive strength, 36.6 MPa; bending strength, 6.8 MPa). The prepared SSPB is not only likely to be a new type of permeable brick for sidewalk construction, but also relieve greatly environmental pollution from steel slag because of the high utilisation rate of steel slag (as high as 90%). K E Y W O R D Sglass-liquid phase, mechanical strengths, permeability, permeable brick, steel slag

“…For the present study, two treatments were selected for the bamboo fibers. To enhance the durability, lignin was partially removed by simply heating the bamboo fibers in water at 85 • C for 72 h and drying them at 80 • C for 24 h [45]. In addition, the bond between the fibers and the mortar matrix was improved by an alkaline treatment, which involved the stirring of the bamboo fibers in a lime (Ca(OH) 2 ) solution for 2 h. The solution contained 40 g of lime per liter of water.…”

Section: Bamboo Fiber Treatmentmentioning

confidence: 99%

“…This suspension was stirred repeatedly during the entire treatment duration to avoid the sedimentation of the fibers and any undissolved lime particles. After the lime treatment, the bamboo fibers were dried at 80 • C for 24 h. This treatment is known to modify the surface of the fibers and improve their mechanical strength [45].…”

Section: Bamboo Fiber Treatmentmentioning

confidence: 99%

Mechanical Properties and Flexural Behavior of Sustainable Bamboo Fiber-Reinforced Mortar

Maier

Javadian²,

Saeidi³

et al. 2020

Applied Sciences

In this study, a sustainable mortar mixture is developed using renewable by-products for the enhancement of mechanical properties and fracture behavior. A high-volume of fly ash—a by-product of coal combustion—is used to replace Portland cement while waste by-products from the production of engineered bamboo composite materials are used to obtain bamboo fibers and to improve the fracture toughness of the mixture. The bamboo process waste was ground and size-fractioned by sieving. Several mixes containing different amounts of fibers were prepared for mechanical and fracture toughness assessment, evaluated via bending tests. The addition of bamboo fibers showed insignificant losses of strength, resulting in mixtures with compressive strengths of 55 MPa and above. The bamboo fibers were able to control crack propagation and showed improved crack-bridging effects with higher fiber volumes, resulting in a strain-softening behavior and mixture with higher toughness. The results of this study show that the developed bamboo fiber-reinforced mortar mixture is a promising sustainable and affordable construction material with enhanced mechanical properties and fracture toughness with the potential to be used in different structural applications, especially in developing countries.