Strength improvement of recycled aggregate concrete through silicon rich char derived from organic waste

Akhtar, Ali; Sarmah, Ajit K.

doi:10.1016/j.jclepro.2018.06.044

Cited by 56 publications

(19 citation statements)

References 31 publications

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“…Hence, the char derived from wastewater algae can also later be used for the treatment of wastewater. Char contains the possibility to use in other applications such as indirect carbon fuel cells, char recycled aggregate concrete, and as a bio‐modifier in asphalt . The versatility of the properties according to the feedstock and treatment conditions makes the char a suitable material and found recognition in several applications.…”

Section: Introductionmentioning

confidence: 99%

Carbon conversion and stabilisation of date palm and high rate algal pond (microalgae) biomass through slow pyrolysis

et al. 2019

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Summary The processing of waste through pyrolysis technology is gaining momentum worldwide and is considered to be a green technology to reduce CO2 emissions. This study is devoted to analysing the lignocellulosic biomass (date palm) and wastewater‐derived microalgae and the carbon‐rich char produced between temperature range (400°C‐600°C) from these biomass types. The properties of microalgae char showed that significant variation with date palm char exhibited high heating values (24‐28 MJ/kg), low ash content (11%‐16%), and high energy yield (48%‐42%). Algal biomass char showed considerably high nitrogen content (6%‐7%) as compared with date palm char (<1%), lower stability, and more significant influence on the price with respect to treatment temperature. Quaternary, pyrrolic, and pyridinic nitrogen species were found on the surface of the microalgae char, whereas no nitrogen species detected on date palm char due to low nitrogen content. The activation energy was also noted to be high for algal char during pyrolysis and combustion process. It can be concluded that date palm char is suitable for energy applications, whereas, algal char can be used for soil amendment, wastewater treatment, and applications requiring nitrogen‐doped char.

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Section: Introductionmentioning

confidence: 99%

Carbon conversion and stabilisation of date palm and high rate algal pond (microalgae) biomass through slow pyrolysis

et al. 2019

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“…With these considerations, the idea of using waste to reduce the use of coarse aggregate is also growing. The problem of increasing organic waste is also considered to cause a decrease in environmental quality Problems of increasing organic waste can be overcome by by utilizing it for construction purposes or the manufacture of other materials [2], [3]. In terms of construction, especially in the manufacture of concrete, there have been a lot of use of organic waste in concrete mixtures, both as replacement materials and as partial substitutes for materials in concrete mixtures, besides being an innovation in concrete mixtures, it also contributes to reducing organic waste [4]- [6] The use of organic waste in mixing concrete is an innovation for the discovery of new materials in the manufacture of concrete and has been proven to be used for construction work.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Effect of using Salak Seeds as Coarse Aggregate in Concrete

Sulfanita

Dirawan

Ali

2021

AJAS

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This study described the effect of using salak seed waste as a substitute for coarse aggregate. The percentage of salak seed in concrete mixture became experimental variable to discover the best compressive strength of concrete. Quantitative study with experimental study was carried out at the Laboratory of Materials and Concrete, Faculty of Engineering, University. The design of experiment used a designed compressive strength of concrete of 20 Mpa. The experiment consisted of five variations in the percentage of salak seeds, namely 0%, 5%, 10%, 15%, and 20%. The slump test is carried out immediately after mixing the concrete in each proportion. Furthermore, 20 pieces of cylindrical concrete samples in each treatment were tested for 7,14,21 and 28 days. This method aims to compare the strength of each of the resulting concrete compositions. The results obtained showed that the use of salak seeds with a percentage of 5% and 10% gave a compressive strength value of 28 days which met the standard compressive strength of the design female. Meanwhile, the percentage of salak seeds 15% and 20% did not produce the planned compressive strength value. Therefore, salak seeds are suitable to be used as a substitute for coarse aggregate with a percentage of less than 10%. The higher the substitution of the mixture in the salak seed concrete, the lower the compressive strength of the concrete. The results of this study can be developed in green concrete studies that use waste.

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“…So, if recycled clay brick aggregates (RCBA) originated from clay brick wastes can be used to produce RAC as structural concrete, this will be a significant step for the development of sustainable concrete industry. However, RCBA typically exhibited weaknesses when being used to produce RAC, i.e., high porosity and variation in quality [5][6][7][8][9]. For example, because of the high porosity of RCBA, the crushing index and water absorption of RAs can be significantly larger than those of NAs, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the complexity of RCBAs source results in the dispersion and uncertainty of the mechanical properties of RAC in the aspects of flow ability, strength and durability [8]. Thus, the mechanical properties of RAC-RCBA should be improved to expand the range of their application considering the social and environmental benefits to use RCBA [9].…”

Section: Introductionmentioning

confidence: 99%

Strength and ductility improvement of recycled aggregate concrete by polyester FRP-PVC tube confinement

Gao

Huang

Yan

et al. 2019

Composites Part B: Engineering

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In literature, studies on recycled aggregate concrete (RAC) with recycled aggregates (RAs) originated from clay brick waste are rare, which is mainly attributed to the much lower compressive strength of the RAC with recycled clay brick aggregates (RAC-RCBA) when comparing with its normal aggregate concrete (NAC) counterpart. Nowadays it is well known that fiber reinforced polymer (FRP) composites as lateral confining materials can improve the strength and ductility of NAC significantly. In this study, FRP confining materials were used to improve the compressive strength and ductility of the RAC-RCBA. Compared with conventional synthetic glass or carbon FRP composites, polyester FRP (PFRP) and Polyvinyl chloride (PVC) are much cheaper and show much larger tensile deformation capacity. Therefore, this study investigated the axial compressive behavior of PFRP and PVC hybrid tube encased RAC-RCBA (i.e., shortened as PFRP-PVC-RAC-RCBA) structure. This PFRP-PVC-RAC-RCBA system consisted of an RAC-RCBA core, encased by a PVC tube directly and the PVC tube was further confined with a PFRP tube (i.e. PFRP tube-PVC-RAC-RCBA specimen) or PFRP strips (i.e. PFRP strip-PVC-RAC-RCBA) at the outermost layer. Uniaxial compression tests were performed on 33 PFRP-PVC-RAC-RCBA and 39 unconfined RAC-RCBA specimens to evaluate and compare the axial compressive behavior of PVC tube encased RAC-RCBA, PFRP tube encased RAC-RCBA, PFRP tube-PVC-RAC-RCBA and PFRP strip-PVC-RAC-RCBA columns. The tested variables included the number of PFRP layers (3-, 6-and 9-layer), the type of PFRP confinement (in the configuration of tube or strips) and the spacing of the PFRP strips (25 and 50 mm). The tested results demonstrated that the PFRP-PVC hybrid confining system enhanced the compressive strength and axial and lateral deformations of the RAC-RCBA pronouncedly, e.g. the increase in strength ranged from 4.5% to 39.6%. The enhancement in strength and deformations was increased with a thicker PFRP tube or strip. Both the PFRP tube-PVC-RAC-RCBA and PFRP strip-PVC-RAC-RCBA showed the similar axial compressive stress-stain behaviors. In addition, the comparison of PFRP tube-PVC-RAC-RCBA with the glass/carbon FRP tube-RAC-RCBA indicated that the GFRP and CFRP tube confinement resulted in much larger enhancement in ultimate compressive strength of RAC-RCBA due to the much larger tensile modulus and strength of these G/CFRP composites. However, PFRP-PVC tube confinement led to much larger axial deformation of the RAC-RCBA compared with the G/CFRP tube confinement due to the much larger tensile strain of the PFRP and PVC material. Furthermore, designoriented compressive stress-strain models were developed for PFRP-PVC-RAC-RCBA specimens.

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Strength improvement of recycled aggregate concrete through silicon rich char derived from organic waste

Cited by 56 publications

References 31 publications

Carbon conversion and stabilisation of date palm and high rate algal pond (microalgae) biomass through slow pyrolysis

Carbon conversion and stabilisation of date palm and high rate algal pond (microalgae) biomass through slow pyrolysis

Investigation of the Effect of using Salak Seeds as Coarse Aggregate in Concrete

Strength and ductility improvement of recycled aggregate concrete by polyester FRP-PVC tube confinement

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