Article
Construction & Building Technology
Vaishnav Kumar Shenbagam, Rolands Cepuritis, Piyush Chaunsali
Summary: The study investigates the influence of externally available calcium sulfate on the expansion characteristics of concrete, finding that the expansion of blended cement is related to the concentration of gypsum in the exposure solution and the dosage of CSAB, with the stiffness of the matrix playing a role in the resultant expansion.
CEMENT & CONCRETE COMPOSITES
(2021)
Article
Construction & Building Technology
Murat Dener, Mehmet Karatas, Mehrzad Mohabbi
Summary: The study investigated the sulfate resistance of alkali-activated slag/Portland cement mortar produced with lightweight pumice aggregate. Different levels of Portland cement substitution and exposure to sulfate solutions showed varied effects on compressive strength and microstructural deteriorations caused by sulfate attack. Samples immersed in MgSO4 solution displayed excessive physical deterioration, while those in Na2SO4 solution showed better resistance.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Muhtar
Summary: This study aims to identify the quality and performance range of lightweight concrete when replacing a portion of coarse aggregate (NA) with pumice aggregate (PA). Performance parameters such as unit weight, compressive strength, elastic modulus, tensile strength, and rupture modulus were studied. Geochemical analysis and porosity testing were conducted on the aggregate. The results show that concrete with PA consists of two quality zones, namely a brittle zone for PA content above 50% and a ductile zone for PA content below 50%. Formulas for calculating elastic modulus and rupture modulus are proposed.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Review
Construction & Building Technology
Muhammed Tanyildizi, Islam Gokalp
Summary: This study aims to introduce the use of pumice as aggregate in concrete for sustainable construction. The findings show that using pumice has certain benefits including increased workability and high-temperature resistance, but also negative effects on concrete properties such as decreased freeze-thaw resistance and abrasion resistance. More investigation is needed to determine the feasibility of using pumice in concrete production.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Sevin Ekmen, Kasim Mermerdas, Zeynep Algin
Summary: This study conducted a comprehensive experimental research to evaluate the impact of mix parameters and compound characteristics on the engineering properties of lightweight geopolymer mortar (LWGM), finding that SS/SH and S/FA significantly influenced viscosity behavior and the mechanical properties of hardened LWGMs demonstrated strong correlation with oxide compositions.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Chemistry, Physical
Marzena Kurpinska, Jaroslaw Karwacki, Artur Maurin, Marek Kin
Summary: The implementation of low-energy construction focuses on technological and material research for thermal insulation. Methods for measuring thermal conductivity are crucial, with transient methods commonly used but steady state methods considered more reliable. Sample preparation and measurement accuracy are key factors in obtaining precise results.
Article
Construction & Building Technology
Longfei Zhou, Mifeng Gou, Shuqiong Luo
Summary: The hydration kinetics of a calcination activated bauxite tailings-lime-gypsum ternary system was studied, demonstrating that the kinetics equation could simulate the hydration process effectively with 5% gypsum. Increasing bauxite tailings content led to shorter induction and appearance times for second exothermic peaks, as well as an increase in the value of the second exothermic peak.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Engineering, Geological
Derya Toksoz Hozatlioglu, Isik Yilmaz
Summary: The study compared the performances of additives in shallow mixing and column techniques by simulating ground models in the laboratory, finding that lime achieved the best improvement for both techniques, while gypsum exhibited the lowest performance. Additionally, the shallow mixing technique showed higher performances than the column technique for lime, fly ash, and gypsum.
ENGINEERING GEOLOGY
(2021)
Article
Construction & Building Technology
M. Krol
Summary: The present study assessed the impact of partially zeolitized expanded glass aggregate on lightweight plaster production. The addition of zeolite did not significantly affect the physical and mechanical properties of the plaster, but noticeably modified its microstructure.
MATERIALS AND STRUCTURES
(2022)
Article
Construction & Building Technology
Maria Teresa Freire, Maria do Rosario Veiga, Antonio Santos Silva, Jorge de Brito
Summary: This paper presents the design and evaluation process of compatible materials to replace damaged interior walls and ceilings coatings made of gypsum-based plasters. Based on quantitative requirements and previous works with historic buildings, it was concluded that three different restoration materials need to be developed. The physical and mechanical properties of different gypsum and lime mixes were determined, showing the gypsum-lime binder proportions to be the most influential factor in material properties.
CEMENT & CONCRETE COMPOSITES
(2021)
Article
Construction & Building Technology
Burak Kocak, Brahim Pinarci, Ugur Guvenc, Yilmaz Kocak
Summary: In this study, two different Artificial neural networks (ANN) and two different adaptive network-based fuzzy inference systems (ANFIS) models were constructed to predict the compressive strength of cement mortar samples with or without pumice and/or diatomite on different days. The models showed very good predictive performance, with a small error, for estimating the compressive strength of the cement mortars.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Sergio Roberto da Silva, Jorge de Brito, Jairo Jose de Oliveira Andrade
Summary: The use of construction and demolition waste (CDW) as recycled aggregate (RA) and fly ash (FA) in cementitious materials can improve the sustainability of concrete. However, RA has lower mechanical strength compared to natural aggregate (NA) and FA delays early age strength development. Adding hydrated lime (HL) can increase the strength of concrete with FA at an early age. Rating: 8/10.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Bilal Balun, Mehmet Karatas
Summary: The study investigates the performance of pumice-based alkali activated materials under different curing conditions, indicating that the addition of OPC enhances compressive strength, with the optimal condition being curing at 100 degrees C for 72 hours. Samples containing OPC exhibit satisfactory performance under ambient conditions as well.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Construction & Building Technology
D. B. P. Silva, N. B. Lima, V. M. E. Lima, A. M. L. Estolano, H. C. B. Nascimento, P. Vilemen, E. Padron-Hernandez, A. M. P. Carneiro, N. B. D. Lima, Y. V. Povoas
Summary: Self-leveling mortar is a fluid cement-based material which eliminates the need for thickening. It provides shorter execution times, better thermal and acoustic properties, and eliminates the need for expansion joints in large areas. The addition of superplasticizer additive (PCE) enhances the properties of the mortar, although it increases the setting times.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Sathwik S. Kasyap, Siyue Li, Kostas Senetakis
Summary: Micro-indentation experiments were conducted to investigate the correlation between microstructural characteristics and mechanical properties of different types of aggregates, revealing that pumice exhibited lower variability in hardness and modulus values compared to other aggregates. The number of indentation cycles had varying influences on different structured aggregates in terms of hardness and modulus values.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Qi Jiang, Wei Liu, Shaopeng Wu, Xuanwen Gou
Summary: This study analyzes the erosion mechanisms of NaCl solution on asphalt concrete and finds that NaCl solution softens asphalt and promotes the intrusion of crystalline salt into it. Salt crystallization alters the surface roughness of aggregates, resulting in a decrease in skid resistance but an improvement in compressive strength. Additionally, the concentration of NaCl solution initially has no significant impact on the mechanical performance of asphalt concrete, but its domination gradually increases with the intensification of cyclic effects.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Lili Kan, Lan-qing Dai, Ning Kong, Bin Peng, Fei Wang
Summary: This paper investigates the effect of freezing and thawing cycles on the tensile behavior of cracked ultra-high performance concrete (UHPC). The results show that long-term freezing and thawing action deteriorates the cracking strength, tensile strength, tensile strain, and strain energy of cracked UHPC. On the other hand, the action of water generally favors the development of tensile properties of UHPC. The crack distribution tends to be unsaturated under freezing and thawing environment, and the re-hydration reaction is hindered. The pore structure near the crack varies under different environments.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Xin Xiao, Jingwei Li, Qingke Meng, Xiangshan Hou, Yanhui Liu, Xujiang Wang, Wenlong Wang, Shengtao Lu, Yuzhong Li, Yanpeng Mao, Tong Li
Summary: Preparing gypsum-based self-leveling mortar (GSLM) using beta-hemihydrate gypsum and solid wastes-derived sulfoaluminate cement (WSAC) can improve the mechanical performance of the mortar, but phosphorus impurities can weaken the hydration speed and degree.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Sihang Bao, Junzhen Di, Yanrong Dong, Ziqing Gao, Qing Gu, Yuanfang Zhao, Hongyu Zhai
Summary: Tailings dam break and leakage accidents pose a threat to the safety of people in mining areas and cause severe environmental pollution. This study focuses on solidifying tailing sand using microbial induced calcite precipitation (MICP) to improve strength and fix heavy metals. The curing time of MICP bio-cemented tailings is found to significantly impact the strength of tailings, while its effect on heavy metal fixation is minimal. The optimized MICP curing time is 10 days, resulting in improved strength and cementation of tailings particles.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Ferhat Benmahiddine, Fares Bennai, Achraf Charaka, Ameur El Amine Hamami, Abdelkader Tahakourt, Rafik Belarbi
Summary: This paper studied the effects of hysteresis on the hygrothermal behavior at the building scale. Through laboratory validation and numerical simulations, it was found that hysteresis has a significant impact on the relative humidity and total heat fluxes in buildings, while it does not have a noticeable effect on temperature variations.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
You Gao, Wei He, Xiayang Zhang, De'an Sun, Pei Li
Summary: This study determined the boundary line between the swelling and compression deformation zone in lateritic clay through wetting tests, and proposed a simple bimodal SWRC model. It also found that the existing strength model underestimated the tested values in the medium to high suction range, therefore a segmented strength equation was introduced for enhanced predictions of the strength properties of lateritic clay.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Prabhath Ranjan Kumar Soda, Asheer Mogal, Kalyan Chakravarthy, Nikhil Thota, Nimish Bandaru, Sanjay Kumar Shukla, K. M. Mini
Summary: This study investigates the use of encapsulated bacteria to improve the self-healing ability of concrete. Through various tests, it is found that using 20% cement-coated alginate beads (CCAB) and 5% nanosilica (NS) can achieve optimal strength and healing. This research is significant for enhancing the durability of concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Shizhe Wang, Haiping Wu, Wen Yang, Wei Wang, Zhibo Zhu, Kun Nie, Luoxin Wang, Hua Wang, Jing Wu
Summary: In this study, photothermal-heat storage concrete (PHSC) was developed with excellent photothermal conversion performance and heat storage capacity. By absorbing and storing solar energy during the day and releasing it at night, PHSC can effectively reduce energy consumption in buildings.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Robin Deb, Jialuo He, Geetika Mishra, Yaghoob (Amir) Farnam
Summary: Incorporation techniques of phase change materials in cementitious composites have a significant influence on thermal properties. This study investigated the thermal behavior of low-temperature PCM when subjected to varying temperature change rates and pore confinement inside the porous network of lightweight aggregates. The results showed that ramp rates affect the nucleation and crystallization growth process during the phase transition, and the pore structure of the aggregates affects the supercooling phenomenon and confinement pressure of the PCM.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Eduardo Ferreira, Payam Sotoudeh, Dagmar Svecova
Summary: This study investigates the fatigue behavior of concrete under different stress reversal conditions. The results indicate that stress reversal generally causes more severe damage and reduces the cycles to failure compared to tensile fatigue. Additionally, adding some level of compression contributes to the energy required for failure under stress reversal fatigue. Specimens with higher concentration of fractured aggregates achieve longer fatigue lives.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Mag Raj Gehlot, Sandeep Shrivastava
Summary: This study evaluates the compatibility relationship between plaster bonds and the substrate under an accelerated aging environment, and finds that incorporating an appropriate amount of granite cutting waste can improve the strength parameters and adhesion of the cement mortar.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Min Zhang, Qirui Luo, Mingke Deng, Shixing Zhao
Summary: This study investigated the bond behavior between carbon FRCM composites with added short fibers and concrete substrates. The effects of different factors were considered and 36 specimens were tested and discussed. The experimental results were analyzed in terms of failure mode, load-slip curve, and characteristic parameters, and the contribution of weft yarns was taken into account in the developed bondslip model.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Dengkai Liu, Hongniao Chen, Ray Kai Leung Su
Summary: The susceptibility of building stones to fire and high temperature was investigated in this study by examining their physical and mechanical properties. The results show that both compressive and tensile properties of stones are affected by temperature changes. The tensile strength is particularly sensitive to temperature changes, requiring special attention to the components subjected to tensile stress in stone buildings. Principal component analysis was used to predict the mechanical properties of stones, providing a new method for calculating the residual mechanical properties after high temperature or fire.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Joso Maria Raposo, Eduardo Cavaco, Luis Costa Neves, Eduardo Julio
Summary: This paper investigates the correlation between the friction coefficient and the surface roughness of concrete-to-concrete interfaces. Experimental tests were performed on specimens with different surface treatments, and the surface roughness parameters were analyzed and correlated with the shear strength and friction coefficient. The results showed that certain roughness parameters had a strong positive correlation with the friction coefficient, while others had little or no correlation. A novel combined roughness parameter with optimized correlation was proposed.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Chiara Riccardi, Massimo Losa
Summary: The interest in using bio materials in asphalt pavements is growing due to economic reasons and environmental benefits. This study aimed to review the use of bio extenders as additives in binders, with a focus on replacements greater than 20% of fossil binder. The properties of bio-extended binders were found to vary substantially depending on the biomass source and production process.
CONSTRUCTION AND BUILDING MATERIALS
(2024)