Article
Biochemistry & Molecular Biology
Jorge Luis Costafreda, Domingo Alfonso Martin
Summary: This study describes newly discovered zeolites in eastern Cuba, analyzing their chemical and physical properties for potential industrial use as pozzolanic cements. The results show high levels of reactive SiO2 and CaO in the samples, making them suitable for such applications.
Article
Construction & Building Technology
M. Shariful Islam, B. J. Mohr, D. VandenBerge
Summary: The present study investigated the performance of natural clinoptilolite zeolite and compared it with other commonly available pozzolanic materials. The results showed that clinoptilolite zeolite had different effects on workability, hydration time, chemical shrinkage, and compressive strength compared to other materials. Additionally, zeolite exhibited excellent resistance to chloride-ion penetrability and ASR-induced expansion.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Chemistry, Inorganic & Nuclear
Lokesh Kumar, Raminder Kaur, Jaigopal Sharma
Summary: This study found that both natural and synthetic zeolites are significantly effective in treating ammonia nitrogen, but their efficiency is limited by competing ions in natural water. It is suggested to replace sand media in municipal water treatment facilities with certain zeolites to enhance the removal of ammonium ions.
INORGANIC CHEMISTRY COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Jeffery A. Greathouse, Matthew J. Paul, Guangping Xu, Matthew D. Powell
Summary: Strong gas-mineral interactions and slow adsorption kinetics affect gas mobility in zeolite pores, especially at pore-limiting window sites. This study combines molecular simulations and experiments to investigate noble gas adsorption and mobility in two zeolites. The results show that even the largest gas (Rn) can be accommodated in both zeolites, but gas mobility is significantly hindered in clinoptilolite. The experimental results confirm the presence of a kinetic barrier to Xe uptake, resulting in reverse Kr/Xe selectivity. A kinetic model is used to compare gas diffusivity in the zeolite pores.
CLAYS AND CLAY MINERALS
(2023)
Article
Engineering, Civil
Mojtaba Rangrazian, Reza Mahjoub, Rahmat Madandoust, Mehdi Raftari
Summary: This study aims to optimize the weight fraction of local mineral pozzolan (Asiabar) in concrete mixture. Four concrete mixtures with varying proportions of pozzolan (5%, 10%, 15%, and 20% by weight) were studied. The experiments showed that the best replacement ratio of pozzolan is 15% by weight of cement, resulting in a 24% increase in strength compared to ordinary cement concrete. The pozzolan reduced the content of portlandite and calcite, decreased the number of pores, and improved the integrity of the interfacial transition zone (ITZ) in the concrete.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2023)
Article
Construction & Building Technology
Abdul Vahap Korkmaz
Summary: This study investigates the possibility of using diabase, a volcanic rock, as an additive in cement production. Diabase was mechanically activated and added to cement to enhance its properties. The effects of different proportions of diabase as an additive on cement performance were analyzed. The results show that diabase can be a viable alternative to traditional mineral additives in cement production, offering improved mechanical properties and lower costs.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Review
Chemistry, Multidisciplinary
Victor A. Franco-Lujan, Fernando Montejo-Alvaro, Samuel Ramirez-Arellanes, Heriberto Cruz-Martinez, Dora I. Medina
Summary: This study reviews and analyzes the properties of fresh and hardened states of nanomaterial-reinforced Portland cement-based materials. The results show that the partial replacement of Portland cement by nanomaterials can increase their mechanical properties at early ages and significantly improve their durability. Long-term studies on the mechanical and durability properties of nanomaterial-reinforced cement materials are highly necessary due to the advantages of nanomaterials as partial replacements for Portland cement.
Article
Construction & Building Technology
D. M. Gonzalez-Garcia, L. Tellez-Jurado, F. J. Jimenez-Alvarez, L. Zarazua-Villalobos, H. Balmori-Ramirez
Summary: This study investigated the impact of different types of alkali on the structural evolution of a natural pozzolan from Hidalgo, Mexico. It was found that sodium solution facilitated the dissolution of aluminosilicates in the pozzolan and promoted the formation of interconnected structures compared to potassium solution. The presence of potassium solution delayed the condensation step, resulting in slower evolution of compressive strength at certain curing times. The final geopolymer microstructure exhibited a morphology of thick plates.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Chemistry, Physical
Tiago M. S. Agra, Victor M. E. Lima, Priscilla E. A. Basto, Antonio A. Melo Neto
Summary: This study evaluates the potential of water treatment sludge ash (WTSA) as a high-reactivity pozzolan and analyzes the consumption of calcium hydroxide in the hydration process. The results show that ash calcined at 600 degrees C (SA600) achieved higher compressive strength values and exhibited higher consumption of calcium hydroxide in hydrated lime pastes. Therefore, WTSA has the potential to be used as a high-reactivity pozzolan.
APPLIED CLAY SCIENCE
(2023)
Article
Construction & Building Technology
Xuan Zheng, Kefan Liu, Shengzhe Gao, Fangzheng Wang, Zhongzhen Wu
Summary: In this study, the effect of the pozzolanic reaction of zeolite on its internal curing performance in cement-based materials was experimentally investigated. The results showed that the pozzolanic reaction increased the pore volume and water absorption of zeolite particles. The internal curing with zeolite shortened the humidity saturation period of cement paste and improved the relative humidity.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Qing Wang, Zihao Xiong, Jianqiang He, Mianheng Lai, Johnny Ho
Summary: Calcination above 500 degrees C effectively optimizes the pore structure of zeolite and improves the rheological performance of cement pastes containing zeolite.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Dalius Kriptavicius, Giedrius Girskas, Ernestas Ivanauskas, Aleksandrs Korjakins
Summary: This article analyzes the combined effect of a mixture of natural zeolite and ground soda lime silicate glass on the durability properties of concrete, and finds that the mixture of additives can improve the durability and hydration of concrete.
Article
Physics, Applied
Satriyo K. Wahono, Adid A. Dwiatmoko, Alex Cavallaro, Sathish C. Indirathankam, Jonas Addai-Mensah, William Skinner, Ajayan Vinu, Krasimir Vasilev
Summary: This study reports the synthesis of a solid-state amine adsorbent using natural mordenite-clinoptilolite zeolite as the base material, prepared through plasma polymerization and deposition. The plasma deposition technique significantly increases the CO2 adsorption capacity and may facilitate regeneration, making the amine plasma polymer-based zeolite adsorbent a promising candidate for CO2 capture and separation applications.
PLASMA PROCESSES AND POLYMERS
(2021)
Article
Construction & Building Technology
Tiao Wang, Tetsuya Ishida, Rui Gu, Yao Luan
Summary: This study investigated the pozzolanic reaction and curing temperature-dependence of low-calcium fly ash in cement systems over 2 years. It was found that fly ashes have different reactivities and temperature dependencies even though they have similar material properties. The Al/Si ratio of the C-(A)-S-H gel in fly ash-blended cement paste increases as the Ca/Si ratio decreases.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Chemistry, Physical
Yanzhi Gao
Summary: This paper evaluates the physical properties of natural pozzolan and investigates its effects on the microstructure, compressive strength, and early-age chemical shrinkage of cement pastes. The results show that the addition of pozzolan decreases the compressive strength of hardened cement pastes. The reactivity of pozzolan is closely related to its fineness, and higher pozzolan content leads to lower strength. XRD and TG analysis demonstrate that Ca(OH)2 is consumed by reacting pozzolan, forming new C-S-H. Additionally, the addition of pozzolan increases the porosity and decreases the chemical shrinkage of cement pastes.
FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
(2023)