bluuebunny/crossref_metadata_2025_split huggingface dataset:
Cement Mortars with Incorporation of Foundry Industry Wastes: Physical, Mechanical and Durability Behavior
Authors: Cunha Sandra , Silva Raphael , Aguiar José 
Published: November 2024

Abstract
Planet Earth is facing real challenges that require urgent and significant measures. It is necessary to give a new direction to the construction sector, making it essential to change the way that raw material is selected, giving preference to industrial by-products. The utilization of industrial wastes allows minimize the high consumption of natural raw materials, energy consumption and waste deposition in landfills. It is important to note that the use of waste in the construction industry is a great opportunity, however, the heterogeneity of these materials and sometimes their contamination can compromise the durability. The lost-wax process in foundry industry is currently an expanding area, so more and more manufacturing industries have serious problems related to their waste management. During its production process, wastes of ceramic mold shells and paraffinic wax are generated and until now any practical application is known. The main objective of this study was the correlation between the physical, mechanical behavior and durability of cement mortars with incorporation of paraffin wax and ceramic mold shells. The main results revealed a decrease in water absorption, flexural strength, and compressive strength of the mortars, along with a slight increase in degradation during freeze-thaw cycles. Additionally, a correlation was observed between the physical, mechanical performance, and durability of the mortars. This included factors such as water absorption through immersion and capillarity, as well as the relationship between compressive strength and the mass loss suffered during freeze-thaw tests.
Recycled Brick Fines for New Alkali Activated Binder
Authors: Grellier Adèle , Bulteel David , Courard Luc 
Published: November 2024

Abstract
The construction industry today produces huge quantities of wastes, especially during the deconstruction and demolition of buildings. Ceramics and bricks represent a significant part of this inert waste in Belgium and Northern France. The recycling of bricks is already carried out in the form of aggregates used in road embankments. But this constitutes what is called a “downcycling” operation. The investigated way is here a valorization with higher added value in alkali-activated materials through substitution of blast furnace slag (GGBFS) by brick fines with a grain size D50 = 20 µm. It is shown that brick fines can be a precursor equivalent to GGBFS and thus lead to mechanical performances equivalent to control even up to 50% substitution rate in brick fines. Under certain conditions of alkali-activated solution concentration, the addition of 30% brick fines can greatly improve workability time. But this leads to a decrease in mechanical performances, which is still in accordance with specific construction needs.
Recycled Cement Concrete as an Eco-Friendly Aggregate in Polymer Composite – Application Feasibility
Authors: Kępniak Maja 
Published: November 2024

Abstract
Over the years, the development of sustainable and ecofriendly concrete has been found in the reuse of construction and demolition materials. One such waste is recycled aggregate from cement concrete structure demolition process. This paper analyzes the effect of substitution of natural stone aggregate with recycled aggregate in polymer composites. An experimental plan for the mixtures was prepared. Technological characteristics (setting course, consistency) and strength characteristics (flexural strength and compressive strength) were analyzed. The obtained results were statistically analyzed. A generalized utility function has been established. Based on it, the maximum dosage of recycled aggregate was determined without significant deterioration of technological and strength characteristics. The average compressive strength results obtained were in the range of 88.5 to 96.5 MPa. The highest compressive strength value (96.5 MPa) was obtained for the samples with the composition with the highest proportion of recycled aggregate.
Geopolymer Composites with Recycled Binders
Authors: Kalinowska-Wichrowska Katarzyna , Pawluczuk Edyta , Kosior-Kazberuk Marta , Chyliński Filip , Barriguete Alejandra Vidales , Ramirez Carolina Pina 
Published: November 2024

Abstract
The application of geopolymers as an alternative to cement concretes is becoming increasingly important. The significant advantage of this composites is that, the basic ingredient is not a cement, but pozzolans such as waste materials—fly ash, fly ash slag mix, red ceramic fines, recycling cement mortar—which makes building materials more environmentally friendly. Currently the availability of blast furnace slag and high-quality fly ash is limited in Europe. At the same time, the ways for management of the concrete rubble and the construction waste are being sought, because the volume of waste materials is constantly increasing.
Therefore, the application of secondary binders extracted from the recycling of various construction waste (recycled cement mortar, red ceramic fines, fly ash-slag mix) in geopolymers was proposed. The recycled binders were introduced into geopolymer composites as a replacement of 25% by mass of primary binder (fly ash) and the 65, 75 and 85ºC was the curing temperature. The process of manufacturing the recycled binders has been described and basic parameters of new binders. The tests of physical and mechanical properties of the composites such as compressive strength, flexural strength, volume density in dry state and saturated one and water absorption were performed. The microstructure of geopolymers was examined using scanning electron microscopy (SEM). The results obtained show that recycled binders obtained from the treatment of construction waste could be a valuable component of geopolymers.
Towards the Use of Waste Limestone Powder as a Filler for Epoxy Coatings in Floors: Research on Mechanical Properties
Authors: Chowaniec-Michalak Agnieszka , Czarnecki Sławomir , Sadowski Łukasz 
Published: November 2024

Abstract
This paper presents an analysis of the mechanical properties of modified epoxy coatings used as epoxy floors. Waste mineral powder (limestone powder) was used as filler for the epoxy coating. Epoxy resin mixtures were made with waste limestone powder in amounts ranging from 0% to 29% of the mixture mass. Then, four mechanical properties were tested: hardness with the Shore D durometer, tensile and flexural strength with a standard testing machine, and pull-off strength by the pull-off method. The use of waste limestone powder as filler for epoxy coatings resulted in an improvement in hardness by 5%, does not significantly change the pull-off strength, but a deterioration of tensile strength by 6–27% and flexural strength by 18–38%. However, the modified epoxy coating still meets the standard requirements for epoxy floors. Therefore, waste limestone powder can be used in practice as filler for epoxy floor coatings. This solution allows the recycling of mineral powders, reduces the consumption of harmful epoxy resin and lowers the cost of the coating.
The Use of Polymer Concrete as a Cost-Effective and Durable Alternative for Rapid Pothole Repair in Asphalt Surfaces
Authors: van Zyl Frans Willem , Kruger Deon 
Published: November 2024

Abstract
The paper describes an investigating into the application of a polymer concrete using a recyclable material such as polypropylene and chopped tire rubber as aggregate material to provide a durable and cost-effective alternative to the existing cold mix asphalt (CMA) pothole repair material. Three different aggregate mix designs, including traditional crusher- sand and -stone, rubber crumbs, and plastic chips, in combination with Vinyl Ester, Polyester, Polyurethane and Furan resin were combined to create 12 possible polymer concrete mixes to be used as a rapid pothole repair material. These polymer concrete mix designs were tested for common properties and characteristics typically experienced on road surfaces. These include characteristics such as compressive strength, flexural strength, and abrasion resistance. All results obtained from the various tests performed indicated that the polymer concrete mix designs exhibit enhanced physical properties compared with CMA and would thereby increase the durability and lifespan of repaired potholes when using this material.
Serviceability Limit State of Fiber Reinforced Concrete Beams with BFPB Bars and Stirrups
Authors: Krassowska Julita , Kosior-Kazberuk Marta 
Published: November 2024

Abstract
The work analyzes the serviceability ultimate limit state of 4.5 m long fiber-reinforced concrete beams with basalt bars and stirrups (BFRP). On the basis of previous tests, deformations in beams with composite reinforcement are above acceptable values. Beams were made of concrete with basalt fibers to improve deformability, cracks resistance and deflection. The tests showed that the load capacity of beams reinforced with BFRP bars was lower than that of beams with steel reinforcement, resulting from different failure mechanisms of both beams. The failure of beams with BFRP reinforcement was rapid. Deformations in the concrete were reduced by using basalt fibers in the concrete. Increasing the stiffness of the structure with reinforcement with BFRP bars and stirrups using concrete with basalt fibers can meet the SLS requirements for limiting the deflection and cracking of concrete elements reinforced with them.
Fast Tannic Acid Surface Modification for Improving PE Fiber-Cement Matrix Bonding Performances
Authors: Rezaie Ali Bashiri , Liebscher Marco , Mohammadi Mahsa , Mechtcherine Viktor 
Published: November 2024

Abstract
In cementitious composites, an application of various fibers can contribute to endow a controlled crack propagation, moderated brittle failure, superior tensile strength and higher energy absorption capacity. Fiber-matrix bonding properties play a key role in fiber strengthening efficiency and the final mechanical performances of the reinforced matrices. This is true specifically for high-performance polyethylene (PE) fibers which yield very high tensile strength and modulus of elasticity, but do not interact properly with cementitious matrix due to their inert hydrophobic surface lacking functional groups.
In the presented work, PE fibers are functionalized by using fast tannic acid modification technique to enhance the bonding properties between a cementitious matrix and the fibers. Environmental scanning electron microscopy (ESEM) confirmed the presence of polymer coating layers on the fiber surfaces. Micromechanical tests indicated that the modified fibers considerably improved the maximum fiber pullout force, interfacial shear strength and pullout work in comparison with the reference fibers. This enhancement in bonding properties could be traced back to the created functional layer on the PE surface triggering a better interaction with cement hydrates as well as a rougher surface enhancing fiber-matrix mechanical interlocking at interfaces. Overall, the introduced approach can be applied for different fibers to promote their bonding behavior with cementitious matrices resulting in an enhanced fiber reinforcing effect in composites.
Physical and Mechanical Characterization of Cement Boards with Incorporation of Free Phase Change Materials
Authors: Cunha Sandra , Aguiar Ingried , Aguiar José 
Published: November 2024

Abstract
Currently it is necessary to give a new direction to the construction sector, making it essential to change the way that buildings are constructed and rehabilitated, with the aim of obtaining a construction with greater sustainability value. To minimize energy consumption, it is important to take advantage of renewable energy sources like solar power. Phase change materials (PCM) can help reduce building energy consumption due to their energy storage capacity. PCM has been studied in different solutions for walls, ceilings, and floors, essentially using encapsulation techniques. The use of PCM in building materials has social, environmental, and economic benefits, including increased thermal comfort, decreased energy consumption from non-renewable sources, and reduced air conditioning needs and costs. The development of cement boards incorporating PCM brings a new option for the thermal improvement of buildings, which can be used in new buildings and rehabilitation operations. The main objective of this study was the development of cement boards with the incorporation of pure and free PCM, through direct incorporation, consisting of a simple, low-cost, and very promising incorporation technique. The results showed that the technique was easy to use in manufacturing cement boards for interior coatings of building walls and ceilings. It was also possible to observe a decrease in the water/cement ratio with the incorporation of PCM and a consequent decrease in the porosity, which resulted in a slight reduction in its mechanical strengths, without ever compromising the necessary performance for its function.
Novel Sustainable Polymer-Based Phase Change Materials (PCMs) for Mortars Based on Different Binders for the Energy Efficiency of Buildings Located in Different Climatic Regions
Authors: Sarcinella Antonella , de Aguiar José Luís Barroso , Cunha Sandra , Frigione Mariaenrica 
Published: November 2024

Abstract
A possible solution to reduce the consumption of fossil fuel and energy demand to power heating and cooling devices is represented by Phase Change Materials (PCMs). They can absorb, store and release energy according to their physical state that changes with the environmental temperature. In this work, novel eco-sustainable PCMs were developed through the form-stable method. Through this process, it was possible to create composite PCMs consisting of a natural inert matrix (i.e., a very porous stone obtained from processing waste) and an eco-friendly polymer, i.e., Poly-Ethylene Glycol (PEG). The composite PCMs were used to replace aggregates in mortars based on different binders (i.e., hydraulic lime, and cement). A complete characterization was performed on the new PCMs assessing their thermal stability and thermal efficiency. The study of the properties of the PCM-based mortars, in their fresh and hardened states, allowed to identify those with suitable mechanical properties. These latter were, then, subjected to a further investigation to assess their thermal behavior in response to different climatic loads. Encouraging results were achieved that allowed to establish the effectiveness of the novel PCMs in thermo-regulating an indoor environment.
The Retrospection of Development of NCM in the Primary grades： A Case Study from Evidence-Based Perspective
Authors: Liu Qimeng , Dong Yaoyao , Xie Zhiyong , Liu Jian 
Published: November 2024

AbstractThe calling for transforming textbook development into evidence-based field have been increasingly concerned, while the method and path of how to develop evidence-based textbook still remain. New Century Mathematics (NCM) as one of the textbooks with largest market share and influence, its’ development history has witnessed the trajectory of mathematics curriculum reform in China in the last 40 years. This study aimed to retrospect the process of NCM textbook development in primary grades from an evidence-based perspective. Historical research design was employed to explore in what way and how does NCM get to evidence-based textbook development. Qualitative research methodology of the semi-structure interview, focus group interviews, and documentary research have been applied to collect data. The result indicated that in the process of getting to evidence-based textbook development, there are three key features should be mentioned, including Situation + question string establishes the textbook style; Form a complete chain of evidence from fragmented to systematic; Achieving learning-centeredness with the Five Unifications. There were six steps which contained several rounds of data collection. They are preliminary practical investigation, fundamental research, systematic revision, learning and teaching trail, review and revision, and typography and submission for validation. It manifests how does NCM carry out evidence-based textbook. By drawing on the retrospection of development of NCM textbook, the study provides a critical analysis of contemporary methods and issues for mathematics textbook development in China, and puts forwards evidence-based paradigm of textbook development which may provide an inspiration for the whole mathematics textbook research field.
A Design Framework for Project-Based Learning Textbook in Primary Mathematics
Authors: Dong Yaoyao , Liu Qimeng , Zhang Qinqiong , Liu Jian 
Published: November 2024

AbstractProject-based learning (PBL) is an effective approach to develop students’ twenty-first century core literacy. The development of PBL textbooks in mathematics can contribute to the implementation of PBL and the cultivation of students’ mathematical literacy, thereby promoting the reform of classroom instruction. Relying on the New Century Mathematics (NCM) that is one of the mainstream textbooks in China, this study takes the lead in integrating mathematics PBL into the national curriculum. It combines literature analysis and expert argumentation, focusing on five key processes of mathematics PBL (include Create the real-life context; propose and split a driving task; design and implement subtasks; display and exchange the product; reflection and revision) and its design principles, thus forming a design framework, which can provide inspiration for the development of textbook materials and teaching of mathematics PBL.
Problem-Posing: An Inclusive Activity for Improving Teaching and Learning of Mathematics at the University Level
Authors: Radmehr Farzad 
Published: November 2024

AbstractProblem posing (PP) could be defined in mathematics as “the process by which, on the basis of mathematical experience, students construct personal interpretations of concrete situations and formulate them as meaningful mathematical problems” (Stoyanova and Ellerton in Proceedings of the 19th annual conference of the Technology in Mathematics Education, 1996, p. 1). The PP activities have been used in research and practice at school mathematics and teacher education programs in the past few decades. However, less attention has been paid to this type of activity at the university level to improve mathematics teaching and learning.
A Comparative U.S.-China Study of Quality Criteria for Junior High School Mathematics Instructional Materials
Authors: Chen Qiumei , Kong Fanzhe 
Published: November 2024

AbstractIn the context of the continuous deepening of curriculum reform and the urgent need to improve the current situation of textbook evaluation, China has paid more and more attention to the quality evaluation of instructional materials. This study takes the U.S. Quality Instructional Materials Tool and the Chinese Compulsory Education Textbook Review Tool as comparative objects, and systematically compares the quality criteria of junior high school mathematics instructional materials from the perspectives of evaluation bases, contents, procedures and methods, with a view to shedding light and making reference to the construction of quality criteria of junior high school mathematics instructional materials in China.
An Investigation of the Use of Technology in Two U.S. Middle School E-Textbooks
Authors: Davis Jon D. , Witt Nicholas E. 
Published: November 2024

AbstractThis study examines a unit involving ratios appearing in the Desmos and Illustrative Mathematics (IM) e-textbooks at grade 6 for the presence of technology tasks and how technology is used in those units. Specifically, we build on a framework used by Sherman and Cayton (2015) to examine the role of mathematical action technology (MAT) as amplifier or reorganizer to solve individual problems or examine relationships. We found that MAT was typically used as a moderate level amplifier in both textbook units. MAT in the Desmos unit was not designed to be used to solve more than one specific problem while MAT in the IM unit did not include multiple representations. Neither e-textbook unit asked students to use MAT to develop and test conjectures.
On the Design and Development of Digital Mathematics Textbooks: Findings from a Systematic Review
Authors: Fan Lianghuo , Li Na , Zhu Fangchun , Li Shuhui 
Published: November 2024

AbstractThis paper presents a systematic survey of research on digital mathematics textbooks (DMTs), with a particular focus on the design and development of DMTs. A total of 65 studies on DMTs were identified and collected from different data sources including journal articles, dissertations and theses, conference proceedings and research reports over the last three decades, and among them, about one third focused on the design and development of DMTs. The results show that the forms of DMTs have gradually moved from CD-based to web-based, tablet-based, and combined-platform-based, which often incorporate multi-media, multi-representation, feedback and evaluations, interactives, and hyperlinks features. Most of them were on one lesson/chapter, with a limited and narrow scope of mathematics content. There is a need for more collaborations between teachers, researchers, textbook designers, and IT developers in the design and development of DMTs. The paper concludes with suggestions for directions for future research.
A Comparative Analysis of the Integration of Mathematics and Art in Chinese and Singaporean Secondary School Mathenatics Textbooks
Authors: Huang Yan , Peng Aihui 
Published: November 2024

AbstractThis comparative study aims to understand the integrative phenomenon between mathematics and art in Chinese and Singaporean secondary school mathematics textbooks. The art-mathematics relationship in the textbooks was analyzed from six dimensions: (1) art to provide context; (2) art in calculation and measurement; (3) art to master concepts; (4) art to use technological resources; (5) mathematical analysis of art; and (6) creating art with mathematics. It was found that the degree of integration of art and mathematics in the textbooks was not high, which mainly focused on mastering concepts, providing context and artistic creation, while the degree of integration in using technological resources and artistic analysis that involving mathematical creativity and critical thinking needed to be enhanced.
The Complexity of Mathematical Expressions in Mathematics Textbooks
Authors: Zhao Si , Guo Yufeng 
Published: November 2024

AbstractUsing a binary-lambda-calculus based calculation method for complexity, we analyze and discuss the mathematical expressions and their complexity in two editions of the Chinese high school mathematics textbooks published by the People's Education Press. There is no statistically significant difference in the complexity of mathematical expressions between the two editions, and the differences are mainly in the interpretation of conceptual knowledge using mathematical expressions, as well as in the types of examples and their solution processes. Among them, the new edition uses changes of mathematical expressions to change the type of examples without increasing the complexity.