Article
Green & Sustainable Science & Technology
Alexander Mezhov, Daniele Kulisch, Antonina Goncharov, Semion Zhutovsky
Summary: There is no consensus on the optimal method to preserve the microstructure and mineral composition of samples during hydration stoppage, especially considering different testing methods. This paper quantitatively compares popular hydration stoppage strategies, including sample size, soaking time, and solvent type, on 7-day hydrated cement paste. Results show that carbonation occurs for samples smaller than 2.36 mm or bigger than 4.75 mm, or samples soaked in a solvent for longer than 1 hour. Fast solvent replacement leads to decreased ettringite and increased pore volume. Among the methods tested, solvent replacement with gentle heating under a vacuum proves to be the most efficient, and isopropyl alcohol is found to stop hydration faster than ethanol and acetone.
Article
Multidisciplinary Sciences
O. A. Mohamed, S. I. El-dek, S. M. A. El-Gamal
Summary: This study investigates the possibility of using different ratios of recycled alum sludge as partial replacement of ordinary Portland cement. MnFe2O4 spinel nanoparticles were used to enhance the mechanical characteristics and durability of the blends. The results showed the suitability of utilizing RAS waste for replacing OPC up to 10%, and the inclusion of NMFs nanoparticles improved the physico-mechanical characteristics and stability against firing. The composite made from 90% OPC-10% RAS-0.5% NMFs presented the best characteristics and is considered optimal for general construction applications. Thermogravimetric analysis, X-ray diffraction analysis, and scanning electron microscope techniques confirmed the positive impact of NMFs particles on the strength and degradation resistance of the nanocomposites.
SCIENTIFIC REPORTS
(2023)
Article
Construction & Building Technology
Xia Liu, Pengkun Hou, Heng Chen
Summary: The study investigates the effects of nanosilica on the hydration and phase assemblage of the GGBS-cement system, revealing the reasons for the poor early performance of high-volume GGBS-replacement cementitious materials.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Chandrasekhar Bhojaraju, Seyed Sina Mousavi, Victor Brial, Michael DiMare, Claudiane M. Ouellet-Plamondon
Summary: This study investigates the effects of adding ground granulated blast furnace slag (GGBS) on cementitious composites containing graphene and graphene oxide. The results show that GGBS can improve the fresh properties and compressive strength of graphene and graphene oxide-modified cementitious composites, compensating for reduced fluidity. The addition of GGBS also affects the thixotropy of the composite paste containing graphene oxide.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Beibei Li, Pengkun Hou, Heng Chen, Piqi Zhao, Peng Du, Shoude Wang, Xin Cheng
Summary: The hydration and hardening properties of supersulfated cement (SSC) can be improved by controlling the dissolution of GGBS and the precipitation of hydrates with nanoSiO(2) (NS). NS increases the reaction rate of SSC, reduces gypsum consumption, compacts the microstructure, and enhances the strength of SSC.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Construction & Building Technology
Sergio Alexander Gomez Nemocon, Juan Manuel Lizarazo Marriaga, Julian David Puerto Suarez
Summary: This research focuses on the rheological influence of ball bearings made of hollow glass microspheres (HGM) on cementitious materials. The study found that the incorporation of HGM improved the fresh state properties of the mixtures while slightly reducing the hardened properties.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Proceedings Paper
Materials Science, Multidisciplinary
S. Elavarasan, A. K. Priya, N. Ajai, S. Akash, T. J. Annie, G. Bhuvana
Summary: The study investigates the use of ground granulated blast furnace slag and metakaolin as alternatives to cement in concrete. The results show that such replacements can increase the strength and durability of concrete.
MATERIALS TODAY-PROCEEDINGS
(2021)
Article
Construction & Building Technology
Ahad Barzegar Ghazi, Ahmad Jamshidi-Zanjani, Hamidreza Nejati
Summary: In this study, Sungun copper mine tailings were used as a partial substitute for cement in concrete construction, leading to increased compressive strength and chloride penetration resistance. Concrete samples with 10-50% and 60-70% mine tailings as a cement substitute exhibited a higher increase in compressive strength compared to the control sample.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Han Wang, Pengkun Hou, Qinfei Li, Samuel Adu-Amankwah, Heng Chen, Ning Xie, Piqi Zhao, Yongbo Huang, Shoude Wang, Xin Cheng
Summary: The addition of LC2 enhances the mechanical properties of slag cement mortars and optimizes the phase composition, promoting early hydration rates and improving later performances.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Renuka Senthil Muthalvan, Loknath Selvaraj, Siva Avudaiappan, Yury Liseitsev
Summary: Modified cement mortar plays a major role in enhancing the properties of conventional cement mortar, and this study focuses on developing Super Absorbent Polymer Modified cement mortars with Nano Silica/GGBS. The experimental investigation found that the compressive strength of the mix combination containing 0.25% SAP and 15% GGBS replacement improved by 6.52%.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Construction & Building Technology
Jianing Sun, Kian Hau Kong, Chao Qun Lye, Ser Tong Quek
Summary: This study investigated the autogenous healing of concrete blended with GGBS and PVA fiber. The results showed that 50% GGBS-blended concrete exhibited good autogenous healing ability, and the addition of PVA fibers enhanced the effectiveness of autogenous healing. The use of GGBS was found to provide a greater potential for autogenous healing in both the short and long term.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Gustave Semugaza, Tommy Mielke, Marianela Escobar Castillo, Anne Zora Gierth, Joo Xian Tam, Stefan Nawrath, Doru. C. C. Lupascu
Summary: This study demonstrates that reactivating Hydrated Cement Powder (HCP) at lower temperatures can reduce energy consumption and CO2 emissions associated with Ordinary Portland Cement (OPC) production. By heating HCP in the range of 400-800 degrees C, optimal strength in regenerated concrete is achieved. X-ray diffraction (XRD), differential scanning calorimetry (DSC), and thermogravimetry (TG) analyze the crystalline phase transitions, while scanning electron microscopy (SEM) shows the microstructure evolution. Using OPC CEM I 52.5R, 600 degrees C is identified as the optimum heating temperature. Thermally treated HCP can partially replace cement in mortar, achieving similar mechanical strength values.
MATERIALS AND STRUCTURES
(2023)
Article
Construction & Building Technology
Xiaohang Zhang, Xinchun Guan, Chongzhi Ma
Summary: The hydration depth, reflecting the thickness of hydrated cement particles, varies with particle sizes and plays a crucial role in improving the quality and economy of cement-based materials. A method combining backscattered electron images and stereological method is proposed to characterize hydration depths of cement particles in hardened cement-based materials. The accuracy of this method is demonstrated for cement particles below 16 μm.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
M. Siva Chennakesava Rao, M. M. Vijayalakshmi, T. R. Praveenkumar
Summary: This paper discusses the environmental impact of construction demolition waste and the potential solutions through recycling and utilizing waste materials in the construction industry. By exploring alternatives to traditional coarse aggregates and reducing the use of cement, researchers aim to promote sustainable development in the building industry.
APPLIED NANOSCIENCE
(2021)
Article
Construction & Building Technology
Sarah Emily L. Gudia, Alchris Woo Go, Marnie B. Giduquio, Roxanne G. Juanir, Janice B. Jamora, Chintya Gunarto, Ian Dominic F. Tabanag
Summary: The quality of sugarcane bagasse ash (SCBA) varies across different areas, affecting its performance as a cement replacement. This research studied the potential of locally available SCBA in the Philippines as a partial cement replacement and determined the appropriate formulations for mortar and concrete production. Different mixtures with varying SCBA-to-binder and water-to-binder ratios were formulated to assess their impact on consistency, setting time, density, and compressive strength. Regression analysis was used to predict water requirements for both paste and mortar. The results showed that increasing SCBA-to-binder ratio led to higher water demand and longer setting time, but also improved the density and compressive strength of mortar up to a certain point.
JOURNAL OF BUILDING ENGINEERING
(2023)
