Results 31 to 40 of about 27,661 (213)

Influence of cement type and admixtures on rheological properties of cement paste / Cheminių įmaišų poveikis reologinėms cemento tešlos savybėms

Engineering Structures and Technologies, 2014
The article aims to research the influence of the chemical admixtures on the rheological properties of Portland cement paste and determine their impact on the effectiveness of hydration induction period. Materials used in the study: Portland cement CEM I
Mindaugas Macijauskas, Albinas Gailius
doaj   +1 more source

Utilization of Waste Materials Using the Müller–Kühne Process—A Life Cycle Inventory Study

Chemie Ingenieur Technik, EarlyView.
This study presents a Life Cycle Inventory of the Müller–Kühne process (MKP), which converts gypsum waste into sulfuric acid and cement clinker. The MKP outperforms conventional cement production regarding material yield, though its specific energy demand is higher. Consequently, potentials for circular gypsum waste utilization are discussed.
Leon Kassner, Manfred Renner, Peter Fröhlich, Martin Bertau, Philip Biessey   +4 more
wiley   +1 more source

Influence and Mechanism Research of Hydration Heat Inhibitor on Low-Heat Portland Cement

Frontiers in Materials, 2021
A kind of microcapsule sustained-release–type hydration heat inhibitor (MSR) was prepared. The effect of MSR on semi-adiabatic temperature rise, setting time, and strength of low-heat Portland cement was investigated.
Fujie Jia, Fujie Jia, Yan Yao, Jingyu Wang, Jingyu Wang   +4 more
doaj   +1 more source

Study on the composite fracture characteristics of filling and reinforcing cracked rock mass after high temperature damage

Deep Underground Science and Engineering, EarlyView.
Cement infill shares compressive and shear stresses during loading, while interfacial friction hinders crack propagation and reduces stress concentration, improving the rock's load‐bearing capacity. Failure modes vary with crack inclination. Unfilled specimens show four modes.
Shihao Yuan, Qiang Sun, Jianjun Hu, Liwei Zhang, Jishi Geng   +4 more
wiley   +1 more source

The “Skin Effect” Assessment of Chloride Ingress into Concrete Based on the Identification of Effective and Apparent Diffusivity

Applied Sciences, 2022
The method of assessment of the “skin effect” for chloride ingress into concrete has been proposed, based on the inverse problem for the identification of at-surface variability of chloride diffusivity under fully saturated conditions.
Zbigniew Perkowski, Zofia Szweda
doaj   +1 more source

Mechanistic insights across curing regimes for enzymatic and biopolymer‐optimized reinforcement in rock masses

Deep Underground Science and Engineering, EarlyView.
This study examines the effects of curing temperature on the mechanical behavior of underground rock masses treated with enzyme‐induced calcite precipitation (EICP) and an innovative biopolymer‐modified EICP (BP‐EICP). Abstract Biocementation is an innovative and sustainable technique for reinforcing weak and weathered rock masses in natural and ...
Mary C. Ngoma, Oladoyin Kolawole
wiley   +1 more source

Selective Optical Properties of Cement for Enhanced Radiative Cooling and Energy‐Efficient Construction Materials

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
Cement phases are good materials for radiative cooling thanks to the selective emissivity in IR ATW. Cement powders have high reflectance of solar radiation which reduces the thermal losses. The onset of the absorption curves is defined by bound excitons. Sulfates have higher radiated powers and reflectance than calcium silicates.
Jozef Janovec, Guido Goracci, Jorge S. Dolado, Andrés Ayuela   +3 more
wiley   +1 more source

Utilization of Iron Ore Tailings as Raw Material for Portland Cement Clinker Production

Advances in Materials Science and Engineering, 2016
The cement industry has for some time been seeking alternative raw material for the Portland cement clinker production. The aim of this research was to investigate the possibility of utilizing iron ore tailings (IOT) to replace clay as alumina-silicate ...
Li Luo, Yimin Zhang, Shenxu Bao, Tiejun Chen   +3 more
doaj   +1 more source

Analyses of microstructural properties of VA/VeoVA copolymer modified cement pastes

Polímeros, 2005
Recently, modern techniques have been applied for analysis of the influence of polymers on microstructural properties of Portland cement, such as Thermogravimetric Analyses (TG), Scanning Electronic Microscopy (SEM), Fourier Transform Infrared ...
Carlos Eduardo M. Gomes, Osny P. Ferreira   +1 more
doaj   +1 more source

Development and Application of a Simplified Method for Preliminary Assessment of Enhanced Oil Recovery and CO2 Geological Storage in Petroleum Reservoirs

Greenhouse Gases: Science and Technology, EarlyView.
ABSTRACT Geologic carbon storage in depleted oil and gas reservoirs is a key CO2 mitigation strategy, utilizing existing infrastructure such as injection wells and pipelines, while capitalizing on well‐characterized subsurface properties. This article introduces a versatile methodology designed to estimate critical parameters, including the number of ...
Nívia Morgana de Oliveira, Paulo Couto, Alexandre Szklo   +2 more
wiley   +1 more source