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Carlos Bazan

Bio: Carlos Bazan is an academic researcher. The author has contributed to research in topics: Flocculation & Adsorption. The author has an hindex of 1, co-authored 2 publications receiving 5 citations.

Papers
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TL;DR: In this article , fly ash was used as a replacement for aggregate in the base layer; in the cemented subbase layer, only fly ash and cement were used, and finite element modeling of the test section using PLAXIS 3D version 2013 showed the vertical stress distribution in the inverted pavement.
Abstract: The inverted pavement system is an alternate type of pavement system compared to rigid and flexible pavement systems. The base layer of inverted pavements is generally a cement-treated layer with varied cement content, depending on the unconfined compressive strength criteria and durability. In the present study, fly ash was used as a replacement for aggregate in the cemented base layer; in the cemented subbase layer, only fly ash and cement were used. An optimized combination of fly ash (22%), aggregate (78%), and cement (3%) was used for the cemented base layer. For the cemented subbase layer, 7% cement and 93% fly ash were used. Therefore, 22% aggregate in cemented base and 100% aggregate in cemented subbase layer can be saved. For the field investigation, a test track was constructed for 0.5 million standard axles (MSA), and performance was monitored with both nondestructive testing (NDT), that is, falling weight deflectometer (FWD), Benkelman beam deflection (BBD), and ultrasonic pulse velocity (UPV), and destructive testing (actual loading, plate load test and dynamic cone penetration test) on the test track. The NDT testing showed that the cemented layers performed well. However, it was found that the pavement failed prematurely under actual loading. The plate load test showed that crack relief failed because of compaction issues. Last, finite-element modeling of the test section using PLAXIS 3D version 2013 showed the vertical stress distribution in the inverted pavement.

4 citations

Journal ArticleDOI
TL;DR: In this paper , a review of low-cost adsorbents for removing arsenic from drinking water is presented, which discusses the parameters that impact adsorption, such as solution pH, temperature, initial As concentration, adsorbent dosage, and contact time.
Abstract: Arsenic (As), a poisonous and carcinogenic heavy metal, affects human health and the environment. Numerous technologies can remove As from drinking water. Adsorption is the most appealing option for decentralized water treatment systems (DWTS) for small communities and household applications because it is reliable, affordable, and environmentally acceptable. Sustainable low-cost adsorbents make adsorption more appealing for DWTS to address some of the small communities’ water-related issues. This review contains in-depth information on the classification and toxicity of As species and different treatment options, including ion exchange, membrane technologies, coagulation-flocculation, oxidation, and adsorption, and their effectiveness under various process parameters. Specifically, different kinetic and isotherm models were compared for As adsorption. The characterization techniques that determine various adsorbents’ chemical and physical characteristics were investigated. This review discusses the parameters that impact adsorption, such as solution pH, temperature, initial As concentration, adsorbent dosage, and contact time. Finally, low-cost adsorbents application for the removal of As was discussed. Adsorption was found to be a suitable, cost-effective, and reliable technology for DWTS for small and isolated communities. New locally developed and low-cost adsorbents are promising and could support sustainable adsorption applications.

1 citations


Cited by
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TL;DR: In this paper , the authors explored the potential application of over-burnt brick with the help of stabilization using a cement-fly ash mixture for the base layer of inverted pavement, and the mixture of fly ash and cement mixture was investigated for their potential application in the subbase layer of the inverted pavement structure.

3 citations

Journal ArticleDOI
TL;DR: In this paper , a bibliometric analysis of ash stabilization in pavement research during 2002-2021, considering language, chronological trends, source types, subject areas, document types, affiliations, journals, countries, and author keywords was performed.
Abstract: Incineration ash stabilization in the pavement is an effective approach to reduce environmental impact and proper disposal. This study aimed to achieve a bibliometric analysis of "ash stabilization in pavement" research during 2002-2021, considering language, chronological trends, source types, subject areas, document types, affiliations, journals, countries, and author keywords. Also, social network analysis (SNA) was used for trends mapping and global collaboration determination among countries. The results exposed that the number of publications has been significantly increased by more than 14-fold over the studied period. Engineering (42%), material science (17%), and environmental science (10%) were three major subject areas. The USA, by 383 publications, was the leading country, followed by India (370) and China (288). The most independent rate of the publications belonged to India (93%), while Australia ranked 1st in cooperator publications (63.4%). The "Construction and Building Materials" published the most related articles, followed by "Journal of Materials in Civil Engineering" and "Road Materials and Pavement Design." Among the top ten productive institutes and organizations, four affiliations were from China, and three institutes were from the USA. Edil, T.B. (34) from the USA, Arulrajah, A. (29) from Australia, and Horpibulsuk, S. (24) from Thailand were the most productive authors. "Fly ash," "compressive strength," "durability," "geopolymer," "strength," and "resilient modulus" had the most growth rate in recent years, based on the author keywords analysis. Besides, the increase of emerging keywords, "pervious concrete," "reclaimed asphalt pavement," and "lateritic soil" are noteworthy in the second half period.

1 citations

Journal ArticleDOI
TL;DR: In this article , a system framework for asphalt concrete pavement construction monitoring was constructed, and the system was successfully developed and applied to a highway construction project, where the results show that the monitoring system significantly improves the construction quality of asphaltcrete pavement, improves the intelligent level of pavement construction management, and promotes the digital development of highway construction.
Abstract: In the construction of asphalt pavement, poor quality is often the main reason for damage to the pavement, which necessitates the use of monitoring systems during the construction stage. Therefore, this study focuses on building an asphalt concrete pavement construction monitoring system to monitor the construction phase. Through a literature review and semi-structured interviews with industry experts, this paper provides an in-depth understanding of the goals and obstacles of asphalt pavement monitoring and discusses directions for improvement. Subsequently, based on the analysis of the interview results, a system framework for asphalt concrete pavement construction monitoring was constructed, and the system was successfully developed and applied to a highway construction project. The results show that the monitoring system significantly improves the construction quality of asphalt concrete pavement, improves the intelligent level of pavement construction management, and promotes the digital development of highway construction.
Journal ArticleDOI
TL;DR: Green chemistry afforded modification of chitosan to afford solid phase extraction of arsenic with unique adsorbent properties and sustainability as discussed by the authors , and this modification was used in the extraction of solid phase arsenic.
Abstract: Green chemistry afforded modification of chitosan to afford solid phase extraction of arsenic with unique adsorbent properties and sustainability.