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SSRN 2023年

作者： Shoukry, Farah Ibrahim Goubran, Sherif Tarabieh, Khaled Environmental Engineering Program School of Sciences and Engineering The American University of Cairo Egypt Architectural Department School of Sciences and Engineering The American University of Cairo Egypt

Global pressures to address the inevitable impacts of climate change have led to an increased focus on carbon footprint accounting. This research paper aims to draw parallels between universities and their host cities in terms of greenhouse gas (GHG) emissions reporting. The research uses the Adaptive Governance framework and the Institutional Analysis and Development framework as a basis for analysing contextual data. The analysis focuses on three case studies in developing nations and selects a university located in each of the cities. Drawing parallels between the cities and their higher education institutions (HEIs) in terms of how they report GHG emissions valuable insights may be gained regarding the challenges and opportunities associated with carbon footprint (CF) reporting. HEIs have the advantage of being smaller and more easily managed than cities, which means they are more agile and possess a faster adaptive capacity, especially when responding to rapidly changing circumstances. There are many ways in which HEIs can influence CF reporting culture at a city level: (1) disseminate HEI expert knowledge on CF measurement;(2) advocate best practices for reducing emissions;(3) strengthen partnerships between local businesses and the city;and (4) to advocate for policy changes at the city level. © 2023, The Authors. All rights reserved.

关键词： Carbon footprint

Navigating the Era of Disruption in the Construction Industry in Indonesia: Challenges for TVET in Architecture

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Navigating the Era of Disruption in the Construction Industr...

STEM Education Conference (iSTEM-Ed), International

作者： Yudhistira Kusuma Lilis Widaningsih Wiwi Widanengsih Architectural Engineering Education Study Program TVET Research Center Universitas Pendidikan Indonesia Bandung Indonesia TVET Research Center Universitas Pendidikan Indonesia Bandung Indonesia

ISBN: (数字)9798350365979

ISBN: (纸本)9798350365986

The growth of technology and the emergence of a challenging era of disruption have changed the paradigm of the construction industry in Indonesia. As an education that covers this, TVET needs to respond and prepare for this condition. Through industry surveys and literature studies, this research aims to describe the direction of development of the construction industry in the era of disruption. It was found that the adoption of technologies such as Building Information Modeling (BIM) is key to construction efficiency. However, challenges arise in integrating the required skills with the TVET curriculum.

关键词： Surveys Training Adaptation models Navigation Conferences Buildings Government

Characterization of Ureolysis and Microbially Induced Calcium Carbonate Precipitation Under Different Incubation and Reaction Conditions

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SSRN 2025年

作者： Joo, Hyun-Woo Fyfe, Matthew H. Verdú, Irene Rahmaninezhad, Seyed Ali Sales, Christopher M. Srubar, Wil V. Hubler, Mija H. Department of Civil Environmental and Architectural Engineering University of Colorado Boulder BoulderCO United States 1111 Engineering Drive – UCB 428 ECOT 441 BoulderCO80309-0422 United States Department of Civil Architectural and Environmental Engineering Drexel University PhiladelphiaPA United States Environmental Department Terracon Consulting Inc. The ColonyTX United States Department of Civil Environmental and Architectural Engineering Materials Science and Engineering Program University of Colorado Boulder BoulderCO United States Department of Biology

This study investigates the ureolysis and microbially induced calcium carbonate precipitation (MICP) characteristics of Sporosarcina pasteurii and Lysinibacillus sphaericus under varying incubation and reaction conditions. A series of batch MICP experiments were conducted to assess the effects of incubation duration and pH, bacterial cell density, and reagent (i.e., urea and calcium ion) concentrations on ureolysis and CaCO3 precipitation characteristics. The findings indicate that both bacteria exhibit higher urease activity after 24 hours of incubation compared to 48 hours, regardless of incubation pH. S. pasteurii exhibits maximum specific urease activity at an alkaline pH (pH 9.0), whereas L. sphaericus reaches peak activity at a neutral pH (pH 7.2). Across six incubation conditions for each bacterium, S. pasteurii exhibits greater sensitivity in specific urease activity, while L. sphaericus maintains a more consistent ureolysis performance. In terms of cell density, a lower OD600 (~0.1) enhances specific urease activity and early-stage mineralization efficiency, whereas a higher OD600 (~1.0) accelerates overall CaCO3 precipitation, enhances terminal-stage mineralization efficiency, and promotes the prolonged presence of vaterite. High reagent concentrations (1.0 and 1.5 M) enhance specific urease activity and CaCO3 precipitation rates and lead to over 93% of vaterite formation, while low reagent concentration (0.3 M) favors calcite-dominant precipitation over time. These findings provide insights into evaluating and optimizing MICP performance under varying incubation and reaction conditions. © 2025, The Authors. All rights reserved.

关键词： Carbonation

Nucleation effects of coccoliths in portland cement

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Matter 2025年

作者： Beatty, Danielle N. Srubar, Wil V. Materials Science and Engineering Program University of Colorado Boulder 4001 Discovery Drive UCB 027 BoulderCO80303 United States Department of Civil Environmental and Architectural Engineering University of Colorado Boulder 1111 Engineering Drive ECOT 441 UCB 428 BoulderCO80309 United States

This work explores the use of photosynthesized coccoliths (intricate CaCO3 particles) as a nucleation agent or cement replacement in portland cement paste. First, coccoliths were produced and harvested from the marine microalgae Emiliania huxleyi and the particle size, morphology, and mineralogy were characterized. Then, the nucleation effects of E. huxleyi coccoliths as seeding agent (0.5, 1, 3, or 5 wt % additions) and limestone filler (5 and 15 wt % cement replacements) were studied using isothermal conduction calorimetry and compressive strength testing. The results were compared with five commercially available CaCO3 sources used as nucleation agents and fillers. While the high surface area of coccoliths (12.22 m2/g) enhanced water demand, it also enhanced nucleation during cement hydration without accelerating hydration, leading to enhanced early-age strength without detriments to 28-day strength. Results highlight a potential carbon reduction strategy, namely employing photosynthesis as a method of mineral admixture production, for the cement and concrete industry. © 2025 Elsevier Inc.

关键词： Portland cement

Evaluating energy retrofit strategies in enhancing operational performance of mosques: A case study of Al-Imam Al-Hussein Mosque

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Cleaner Energy Systems 2024年 9卷

作者： Marzouk, Mohamed El-Maraghy, Maryam El-Shihy, Ahmed Metawie, Mahmoud Structural Engineering Department Faculty of Engineering Cairo University Giza Postal Code 12613 Egypt Architectural Engineering Program School of Engineering New Giza University Km 22 Cairo-Alex Road Giza Egypt

Mosques are unique in terms of architectural design and operational efficiency. architectural Design, building envelope characteristics, intermittent operating schedules, and occupancy patterns all impact the performance. Managing these factors poses challenges regarding reducing energy consumption and simultaneously achieving the occupants' thermal and visual comfort, especially in hot, arid climatic conditions. Also, the potential benefits of daylighting in reducing energy consumption in mosque buildings need to be addressed. Accordingly, this study evaluates the impact of various retrofit strategies on the operational performance of Al-Imam Al-Hussein Mosque, one of the large historic mosques in Cairo, considering the energy performance, thermal comfort, and daylighting performance. The current performance of the mosque has been analyzed using energy simulation software to determine the areas that affect its performance. Hence, five retrofitting strategies have been studied to assess their impact on improving the performance of the mosque. When changes are applied to the building envelope only by changing the glazing type, the visual discomfort is improved while sufficient daylighting is maintained inside the prayer area. By adding a cooling system and applying changes to the building envelope, thermal comfort was improved, and the visual discomfort decreased. However, this has led to an increase in energy consumption. Combining different strategies (as in strategy 5) by changing the glazing type, changing the operation scheme, adding LED lamps with dimmers, and adding a cooling system has improved the defined performance metrics. It has achieved a 23% decrease in the annual energy consumption, decreasing the visual discomfort by 30% while maintaining sufficient daylighting conditions inside the space, and enhancing occupants’ thermal comfort by 65%. The proposed approach aids in evaluating the retrofit strategies of mosque buildings, considering different criter

关键词： Daylighting performance Energy performance Mosques Retrofit strategies Thermal comfort

Utilizing rice husk ash as cement replacement in pervious concrete: A review

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Developments in the Built Environment

Developments in the Built Environment 2025年 22卷

作者： Khankhaje, Elnaz Jang, Hyounseung Kim, Jimin Rafieizonooz, Mahdi Architectural Engineering Program School of Architecture Seoul National University of Science and Technology 232 Gongneung-ro Gongneung-dong Nowon-gu Seoul01811 Korea Republic of

The disposal of rice husk ash (RHA) presents environmental challenges, yet its high silica content makes it a promising partial cement replacement in pervious concrete. While previous studies have explored RHA's role in conventional concrete, comprehensive research on its effects in pervious concrete remains limited. This review systematically analyzes more than 100 peer-reviewed studies published in the last two decades, using predefined screening criteria focused on RHA dosage, processing methods, and mix design strategies. The findings indicate that incorporating 5–10 % RHA enhances compressive strength by up to 29 % and improves abrasion resistance while maintaining permeability. However, excessive replacement levels (above 15 %) reduce porosity and compromise drainage capacity. By identifying research gaps in mix optimization and long-term durability assessment, this study provides valuable insights for advancing sustainable and high-performance pervious concrete. © 2025 The Authors

关键词： Compressive strength

Hearing All Voices: Environmental Issues and Opportunities in South America

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ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023年第35期57卷 12933-12934页

作者： Rosario-Ortiz, Fernando L. Korak, Julie Mihelcic, James Guidotti, Sunny Lowry, Greg Zimmerman, Julie Department of Civil Environmental and Architectural Engineering University of Colorado Boulder 80309 Colorado United States Environmental Engineering Program University of Colorado Boulder 80309 Colorado United States Department of Civil and Environmental Engineering University of South Florida 4202 East Fowler Ave ENB 118 Tampa 33620 Florida United States UNICEF Latin America and Caribbean Regional Office Building 102 Alberto Tejada St. City of Knowledge 0801 Republic of Panama Civil and Environmental Engineering Department Carnegie Mellon University 119 Porter Hall Pittsburgh 15213 Pennsylvania United States Chemical and Environmental Engineering Yale University 17 Hillhouse Avenue New Haven 06520 Connecticut United States

Development of a Multi-Node Monitoring System for Analyzing Plant Growth and Indoor Environment Interactions: An Empirical Study on a Plant Factory

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SSRN 2023年

作者： Kim, Handon Oh, Donggeun Jang, Hyounseung Koo, Choongwan Hong, Taehoon Kim, Jimin Architectural Engineering Program School of Architecture Seoul National University of Science and Technology Seoul01811 Korea Republic of Division of Architecture & Urban Design Incheon National University Incheon22012 Korea Republic of Department of Architecture and Architectural Engineering Yonsei University Seoul03722 Korea Republic of

In plant factories, multi-layered shelves are used to maximize production per unit area by densely growing plants. The large number of plants placed in a spacious area leads to complex interactions between the plants and the growing environment, resulting in a potentially non-uniform growing environment. When the environment is non-uniform, achieving consistent production based on location becomes challenging. This study aims to analyze these interactions through multi-node, multi-factor monitoring in an actual plant factory that engages in hydroponics. To achieve this, we developed a monitoring system tailored for measuring the growth environment in plant factories. Specifically, we created a monitoring device capable of real-time measurement of six key indoor environmental factors, a network system that facilitates multi-node data collection by utilizing both Zigbee and WiFi, and a dashboard for simplified management. The developed monitoring system was implemented in an 'A' plant factory and collected 44,640 data points over a month. It empirically demonstrated that indoor environmental factors vary by location within the growing space, depending on the surrounding environment and the placement and operation of environmental facilities. The temperature of the nutrient solution showed a statistically strong correlation with other indoor environmental factors. This indicates that the operation of environmental facilities in a plant factory should be comprehensively managed in real-time, with a focus on the relationship of the nutrient solution temperature to other indoor environmental factors. Such management is especially crucial when considering the dynamic interrelationships among nutrient solution temperature, other indoor conditions, and the varying demands imposed by plant growth activity. These results offer valuable guidelines for optimizing the growing environment in plant factories and will serve as an important reference for plant factory operators. © 20

关键词： Hydroponics

Construction Research Congress 2022

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Construction Research Congress 2022

Construction Research Congress 2022: Health and Safety, Workforce, and Education, CRC 2022

作者： Celoza, Amelia Leite, Fernanda De Oliveira, Daniel P. Construction Industry Institute AustinTX United States John A. Focht Centennial Teaching Fellowship in Civil Engineering Construction Engineering and Project Management Program Dept. of Civil Architectural AustinTX United States Funded Studies Construction Industry Institute AustinTX United States

ISBN: (纸本)9780784483985

The Construction Industry Institute (CII) is a research and development organization that focuses on the capital projects industry. With over 38 years of research, CII is a leader in the construction engineering and management (CEM) field. The objective of this research was to evaluate the impact of CII's research publications on recent construction engineering and management academic publications. Researchers utilized Google Scholar to identify academic publications that cited CII. Data were collected for the time range between August 2018 and August 2021, yielding a dataset of 354 academic publications and over 500 citations to CII research publications. Analysis identified "Constructability: A Primer" as the most frequently cited research publication in this dataset. Additionally, front end planning, constructability, and planning for modularization were the top cited CII Best Practices. These findings indicate the popularity of the front end planning and constructability best practices among CII's research publications. In addition to identifying the most frequently cited publications and best practices, there was also a gap with respect to publication citations related to strong areas of interest from the industry, such as advanced work packaging (AWP) and technology. These gaps identify some of the many opportunities for future research and development within the capital projects industry. Overall, CII's research has disseminated into broader CEM research and their future-looking research outlook drives the capital projects industry forward as it tackles more uncertainty and new challenges. © 2022 ASCE.

关键词： Modular construction

The Effects of Calcium Carbonate on Sodium Metasilicate-Activated Metakaolin-Based Geopolymer Pastes

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SSRN 2024年

作者： Ren, Jie Dowdy, Nicolas D. Acarturk, B. Cansu Srubar, Wil V. Department of Civil Environmental and Architectural Engineering University of Colorado Boulder 1111 Engineering Drive ECOT 441 UCB 428 BoulderCO80309 United States Materials Science and Engineering Program University of Colorado Boulder 4001 Discovery Drive BoulderCO80303 United States College of Civil Engineering

The influence of calcium carbonate (CaCO3) on the alkali-activation kinetics, microstructure, and compressive strength of alkali-activated metakaolin (MK) geopolymer cements was investigated herein. Experimental results showed that replacing 10-50% of MK with ground CaCO3 particles delayed the acceleration stage of alkali-activation regardless of replacement amount. However, 10% CaCO3 replacement increased the overall degree of reaction and yielded pastes with similar 14- and 28-day compressive strengths compared to the experimental control with no CaCO3 addition. In comparison, 50% CaCO3 replacement led to a lower overall degree of reaction and lower compressive strengths through 28 days of curing. Experimental evidence substantiates that N-A-S-H gel forms in samples containing 0% and 10% CaCO3, while N-(C)-A-S-H gel and/or C-(N)-A-S-H are also present in the binding matrix near CaCO3 particles in samples with higher CaCO3 contents (i.e., 30% and 50%). While the CaCO3 particles were primarily composed of calcite, vaterite, a less stable form of CaCO3, was also evident in the samples containing 30% and 50%, suggesting that the CaCO3 particles were moderately reactive during the alkali-activation. © 2024, The Authors. All rights reserved.

关键词： Calcium carbonate