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Showing 1 to 20 of 30 for “"Cement hydration"”.
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Understanding the retardation of cement hydration caused by zinc
Heavy metals can be introduced into cement as impurities during its manufacturing or intentionally added to make the firing process of clinker more effective. Waste solidification/stabilization is another route through which heavy metals come in contact with cement paste or concrete. It has been …
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The Investigation of Nano Silica in the Cement Hydration Pro
… more of the strength carrying structure of cement: calcium silica hydrate (CSH). In this paper, relationships have been developed to distinguish the benefits when using different sizes of nano silica in cement paste. An extensive regime of experimental analysis was carried out to determine …
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Effects of Curing Temperature and Pressure on the Chemical, Physical, and Mechanical Properties of Portland Cement
… mainly focuses on studying the fundamental hydration kinetics and mechanisms of Portland cement as well as the effects of curing temperature and pressure on its various properties. An innovative test apparatus has been developed in this study to cure and test cement paste specimens under …
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Rheological studies and percolation modeling of microstructure development of fresh cement paste
… rheology, scanning electron microscopy (SEM) and cement hydration studies as well as theoretical modeling to gain fundamental understanding about the microstructure, its control of flow behavior, its development due to hydration, and setting.
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ΜΕΛΕΤΗ ΤΗΣ ΕΠΙΔΡΑΣΗΣ ΟΞΕΙΔΙΩΝ ΣΤΟΙΧΕΙΩΝ ΜΕΤΑΠΤΩΣΕΩΣ ΣΤΙΣ ΧΗΜΙΚΕΣ ΚΑΙ ΦΥΣΙΚΟΜΗΧΑΝΙΚΕΣ ΙΔΙΟΤΗΤΕΣ ΤΟΥ ΚΛΙΝΚΕΡ
… WO3, AND ZRO2 ONTHE PROPERTIES OF CLINKER AND CEMENT. THE EFFECT OF THE PREVIOUS OXIDES ON THEPROCESSES OF RAW MATERIAL SINZERING AND CEMENT HYDRAMON WAS STUDIED BY MEANS OF DIFFERENTIAL SCANNING CALORIMETRY. X-RAY DIFFRACTION OPTICAL AND ELECTRON SCANNING MICROSCOPY. BASED ON THE EXPERIMENTAL …
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Scaling the rock : a micromechanical model for the elastic properties of hydrated cement pastes
Cement is the most widely produced material worldwide. However, the understanding on how its nanoscale composition affect its microscale mechanical properties is limited. In this thesis, a micromechanical model for the purpose of cement hydration simulation was developed and tested using …
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Cement-based solidification of ferro-alloy solid wastes
A literature review presents a background to cement-based S/S, cement hydration behaviour and mechanisms by which metals could be contained in S/S products, based on proposals by other workers. Cr and Zn were of particular interest in this work due to high levels being found in the wastes and the …
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Determinação da fluência do concreto e do coeficiente de Poisson diferido em um estado de tensões de compressão bi-axial
… temperature which occurs in mass concrete during cement hydration and along of time is presented in graphical form. The Principles and Recommendations of the Comité Européen du Béton (CEB) and of the Fédération Internationale de la Précontrainte (FIP) were used in this research, in an attempt to …
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Feasibility of sustainable recycling of drill cutting as additive in flexible base
… Three treatment methods were investigated: lime, cement, and organoclay. Lime reduced plasticity and limited total petroleum hydrocarbon (TPH) mobility but had minimal effect on semi-volatile organic compounds (SVOCs) and increased trace metal leaching. Cement significantly improved compressive …
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Synthesis and Multi-Scale Characterization of Calcium Silicate Hydrate at Multiple CaO/SiO2 Mixture Ratios
… stability, and durability of Portland cement paste. Although Portland cement hydration produces C-S-H, Calcium hydroxide (CH), ettringite, and other hydration products are also acquired from this process and make it difficult to characterize C-S-H exclusively. C-S-H was first …
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Drinking Water Treatment Waste as an Alternative for Internal Curing and Cement Replacement in Concrete
… material when permeability is low. Hydrating cement paste shrinks through several mechanisms broadly grouped into autogenous and drying shrinkage. These mechanisms cause cracks which become high permeability routes for water and aggressive ion movement, such as chlorides to reinforcing steel. …
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Cracking and Roughness of Asphalt Pavements Constructed Using Cement-Treated Base Materials
While cement treatment is a proven method for improving the strength and durability of soils and aggregates, cement hydration causes shrinkage strains in the cement-treated base (CTB) that can lead to reflection cracking in asphalt surfaces. Cracking may then cause increased pavement roughness and …
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Time-Space-Resolved Raman Analysis of Structure-Property Relationships in Heterogeneous Structural Materials
… However, the spatial and temporal complexity of cementitious materials makes it challenging to characterize these materials. Here, a time-space-resolved Raman characterization framework was developed by combining confocal Raman spectroscopy and two-point correlation analysis. In addition, other …
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Analysis of the Physiochemical Interactions of Recycled Materials in Concrete
… sustainability in the production of Portland cement concrete. Two methods are presented, both aimed at achieving more sustainable concrete through the use of waste and recycled materials. The first method involves utilizing reclaimed asphalt pavement (RAP) as an aggregate in structural …
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Structure and Mechanical Properties of Cement and Intermetallic Compounds via ab-initio Simulations
… of minerals formed synthetically during Portland cement hydration or naturally through various geological processes. The importance of these minerals is immense since they are the primary binding phases for Portland cement derived construction materials. Efforts spanning centuries have been …
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Contractor Variability in Construction of Cement Treated Base Layers
… correlated to specific mechanical properties of cement-treated base (CTB) layers and to determine which construction factors exhibit comparatively high variability within individual construction sections of the two pavement reconstruction projects included in this study. In addition, differences …
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Crack-resistant and self-healing cut-off wall materials incorporating polymers and minerals
… sodium silicate in two cut-off wall materials (cement-bentonite slurry and cement mixed soil) is the interest of this study. In general, the addition of the SAPs and oil sorbents has negligible or only slightly adverse effects on the rheology, cement hydration, strength, and permeability of the …
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Multi-functional applications of graphene related materials in cementitious composites
Cementitious composites are the most widely used construction materials with 4.1 billion tonnes of cement being produced globally in 2017. However, cement production is associated with ~7% of the total global anthropogenic CO2 emissions. Moreover, concrete structures suffer from poor durability, …
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Using untreated and nanobubble-treated potable and wastewater in mortar
… alternative water sources that could be used in cement-based materials. These may include non-potable water sources like brackish water, seawater, greywater, and other contaminated waters; however, these normally possess high levels of dissolved salts, organic matter, surfactants, and biological …
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Relationship between decomposition level and induced solidification of peat based on laboratory investigation
… can be filled and bound using ordinary portland cement (OPC) and coal ash (fly ash, FA and bottom ash, BA). Different decomposition levels of peat require different amounts of filler and binder to achieve the optimum strength. The peats are categorized as fabric for the less decomposed peat, …
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