Papers by Keyword: Water Absorption

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Authors: Seung Gu Kang, Yong Sung Kim
Abstract: Artificial aggregates (AAs) were manufactured from the acid clay (waste bentonite) and dredged soil produced at a thermal power plant by sintering at 600~1200°C for 10min. And those specimens were compared with respect to their bloating ability. The aggregates of acid clay had well-developed black core and uniform macro pores. The specific gravity of the AAs of acid clay increased with sintering temperature at 600~1000°C due to densification, but dramatically decreased at 1100°C, and at this temperature, the AAs showed bloating. The specific gravity and water absorption of the aggregates of dredged soil decreased with sintering temperature at 600~1000°C, indicating that the dredged soil has the ability to enlarge the sintering temperature range, favorable for the mass production process. The specific gravity of the AAs fabricated in this research ranged 0.8~2.0 and the water absorption ranged 4~26%, which was sufficient for various applications, such as functional membranes, light weight construction, smart soil, sound absorption and insulation fields etc..
Authors: Mansur Ahmad, Nurul Atiqah Mohd Ayob, Nurul Nadia Mohd Khairuddin
Abstract: The purpose of this study is to investigate the effect of accelerated aging cycle (AAC) on water absorption of the composites. The HDPE composite was subjected to a series of six ageing cycles at an elevated temperature. The cycle consist of immersion in water at (49 ± 2°C), explosion to steam and water vapor (93 ± 2°C), stored in freezer (-12 ± 2°C), and heated in oven (99 ± 2°C). It took approximately twelve days to complete this aging cycle. The effect and the changes of water absorption for both control and after accelerated aging were observed and determined. The results showed that water absorption was significant as the greater the fibre percentage, the higher the water absorption. This behavior occurs for both conditions. There were significant differences in the percentage of the water absorption for both control and accelerated aging cycle.
Authors: Razaina Mat Taib, Dody Ariawan, Zainal Arifin Mohd Ishak
Abstract: Non-woven kenaf fiber mats were prepared from untreated and alkali treated fibers by using a carding machine followed by needle punching. The alkali treatment was carried out by immersing the fiber mats in 6% NaOH solution for 0, 1, 2, 3, 4, and 5 h at room temperature. The untreated and alkali treated fiber mats were impregnated with unsaturated polyester resin via a resin transfer molding technique to form composites. Maximum improvements of flexural strength and flexural modulus of the composites were observed when the fiber mat was alkali treated for 3 h. The improved of both properties can be attributed to better fiber-matrix adhesion between the alkali treated kenaf fiber and the unsaturated polyester matrix most probably via mechanical interlocking. Water absorption tests were conducted by immersing the composite samples in distilled water at room temperature. The water absorption patterns of all the composites were found to follow Fickian behavior. The tendency of the composites to absorb water decreased when the alkali treated fiber mats were used.
Authors: Chun Peng Zhu, Hai Qing Wu, Li Wei Wang
Abstract: Large amounts of sludge are produced in China each year. Its safe disposal and the recycling technology is the only way to solve the problem of sludge pollution, in which the sludge solidification technology is very important. Since the hygroscopic property and self-hardening property of paper sludge ash are important factors for developing cheap and effective sludge curing agent formulations, the research is practically valuable. The present research studies the basic engineering properties of paper sludge ash, its PH value, heavy metals in the extracting solution, hygroscopic property, microstructure and shear strength. The results show: the PS ash was weakly alkaline; the extracting heavy metals are of little pollution; hygroscopic property decreases with increasing pressure and there is a minimum water absorption; shear strength decreases as the water content increases.
Authors: Ling Lin, Yun Neng Chen, Xuan Wang, Wen Zhong Gong, Shan Yuan Wang
Abstract: This work focused on the release behaviour and antibacterial efficiency of Polypropylene (PP)-based and Polyethylene terephthalate (PET)-based hollow fiber with silver particles incorporated (shortened as PP/Ag and PET/Ag). Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) were used to investigate the antibacterial capability of Ag/PP and Ag/PET with the method of antibacterial kinetics experiments. The antibacterial results demonstrated that all samples had an excellent antibacterial property against E. coli and S. aureus, and the antibacterial efficiency of Ag/PET was greater than that of Ag/PP. Furthermore, Inductively Coupled Plasma Atomic Emission Spectrometer (ICP-AS) was applied to detect the release behaviour of silver ions from Ag/PP and Ag/PET. And the results showed that in the same weight of silver incorporated in hollow fibers, the release behaviour of silver ions from Ag/PET was more than that from Ag/PP , which may be explained by the moisture absorption of the PP and PET. From the results of antibacterial and release experiments, it could be concluded that the release behaviour of silver ions from the fibers, which was depended on the moisture absorption of the matrix, was an important parameter to affect the antibacterial efficiency.
Authors: Jie Sheng Liu, Jie Sheng Liu
Abstract: A cost-effective better performing silicone waterproofing agent interpenetrating polymer network coating for the protection of concrete has been developed. The working mechanism of the silicone polymer on the concrete was revealed and the effect of the material on the water absorption, chloride diffusion coefficient of concrete was analyzed. The results showed that the deep penetration of silicone material formed a hydrophobic layer and provides an effective protection against water corrosion and chloride ingress. A long-term protection can be guaranteed in case the surface of the concrete is waterproofing.
Authors: Krishnan Jayaraman, Ying Leong Foong, Tsun Hei Tam
Abstract: Wastes such as saw dust (Pinus Radiata) and milk bottles (High Density Polyethylene - HDPE) are available in abundance. Composite decking materials, consisting of different weight percentages (60%, 70% and 80%) of saw dust and recovered HDPE, were extruded using a co-rotating, conical, twin screw extruder with a decking-profile die. The extruded decking materials were evaluated on their surface finish and shape conformance. The extruded decking materials were tested in accordance with the appropriate ASTM standards to determine their water absorption, thickness swell, static coefficient of friction, weathering and flexural (four-point bending) properties after they met the required quality ratings.
Authors: Xiao Lei Xu, De Cheng Zhang, Fu Tian Liu
Abstract: This paper studied the lightweight ceramsite, thickener and waterproofing agent dosage on the influence of the foam concrete water absorption and strength, and further researched into the amount of foaming agent on the influence of the density and strength. The results show that adding 20% ceramic, 0.03% thickening agent and 1% waterproof agent prepared the best performance of foam concrete.
Authors: M.A. Hassan, Al Emran Ismail
Abstract: In order to reduce cost of production and decrease environmental pollution, so many research work has been conducted and still ongoing as to the possibility to use kenaf fiber in high technologies production. Its shows that kenaf fiber have potential reinforced fiber in thermosets and thermoplastics composites. This paper presents the various of challenges to produce kenaf as a reinforcement which mean to identify the limit of kenaf fiber performance after over all of challenging factor. The main factor that touch on interphase, water absorption, chemical treatment and fiber fraction which mean affect the performance of kenaf fiber as a reinforcement are discussed.
Authors: Ana P. Carvalho, M. Fatima Vaz, Maria J. Samora, João Pires
Abstract: Portuguese ceramic tiles of different origins from XVIth century to XXth century were studied. In this work we describe microstructural, mechanical and mineralogical characterisation and water absorption studies. Microstructural features (pore size) were determined using Scanning Electron Microscope (SEM) photographs. Mechanical tests (four point bending) were performed and the bending strength was determined from the fracture loads. From water absorption essays the absorption coefficient and the total amount of water retained were obtained and the open porosity was estimated. The maximum water absorbed tends to decrease from XVIth century until XXth century, showing a more pronounced drop for the tiles of the XIXth and XXth centuries. This evolution is also observed in the open porosity values. From image analysis data we also observed that porosity decreases progressively with time and an important drop is observed for XXth century tiles. The bending resistance of tiles from XVIIth to XXth century is almost constant and higher than that of XVIth century samples. This evolution does not correlate with porosity. Advances in ceramic processing, such as higher firing temperatures may lead to the appearance of quartz as almost the only crystalline phase. We consider that an increase in the bending strength is due to a more effective vitrification and a lower porosity.
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