نتایج جستجو برای: elastic cement
تعداد نتایج: 98023 فیلتر نتایج به سال:
Alkaline solutions, such as sodium, potassium or lithium silicates, appear to be very promising as healing agents for the development of encapsulated self-healing concretes. However, the evolution of their mechanical and acoustic properties in time has not yet been completely clarified, especially regarding their behavior and related kinetics when they are used in the form of a thin layer in co...
Self-healing is an essential property of smart concrete structures. In contrast to other structural metals, shape memory alloys (SMAs) offer two unique effects: shape memory effects, and superelastic effects. Composites composed of SMA wires and conventional cements can overcome the mechanical weaknesses associated with tensile fractures in conventional concretes. Under specialized environments...
0167-6636/$ see front matter 2011 Elsevier Ltd doi:10.1016/j.mechmat.2011.05.004 ⇑ Corresponding author. Tel:. +1 215 571 3786. E-mail addresses: [email protected], [email protected] Fonseca), [email protected] (H.M. Jennings), jandrade@ drade). 1 Cement chemistry notation: C = CaO, S = SiO2, H This manuscript presents a numerical model of the low-density and high-density calcium– silicate–hydrate (C–S–H) g...
From lime to silica and alumina: systematic modeling of cement clinkers using a general force-field.
Thirteen different cement-clinker crystalline phases present in the lime-silica-alumina system have been systematically modeled using a simple and general force field. This constitutes a new type of approach towards the study of lime-silica-alumina systems, where the simpler and more transferable Lennard-Jones potential was used instead of the more traditional Buckingham potential. The results ...
Bone is more difficult to break than to split. Although this is well known, and many studies exist on the behaviour of long cracks in bone, there is a need for data on the orientation-dependent crack-growth resistance behaviour of human cortical bone that accurately assesses its toughness at appropriate size scales. Here, we use in situ mechanical testing to examine how physiologically pertinen...
Micromechanical interface properties in a concrete repair system determine the performance and reliability of a repaired structure. In order to characterize these properties, nanoindentation technique was applied. Three different repair material mixtures, based on Portland cement or partial replacement of Portland cement with blast furnace slag, were tested. Hardness and elastic modulus values ...
The shrinkage mechanisms of portland cement paste were investigated from shrinkage, weight loss, and pore structure measurements using nitrogen sorption and mercury intrusion porosimetry (MIP). Thin samples (2.3 mm) of well-hydrated (165 d) pastes of 0.4 and 0.6 water-to-cement (W/C) ratios were dried directly from saturated surface dry state to 75%, SO%, 11%, and 0% relative humidity (rh). Fro...
Self-healing microcapsules were synthesized by in situ polymerization with a melamine urea-formaldehyde resin shell and an epoxy resin adhesive. The effects of the key factors, i.e., core-wall ratio, reaction temperature, pH and stirring rate, were investigated by characterizing microcapsule morphology, shell thickness, particle size distribution, mechanical properties and chemical nature. Micr...
abstract: Ultra-high performance concretes with steel microfibers have been studied in depth the aim of producing more efficient and durable structures. The these materials depends on characteristics interface between cementitious matrix. This research investigates micro-nanomechanical properties interfacial transition zone matrix ultra-high composite. effect water/cement ratio distance from mi...
Aiming to explore the optimal mixture ratio and curing age of solidified muddy soil under dynamic load, paper intends investigate whether can be used as filling high-speed railway subgrade. Based on triaxial test, investigation measured strain elastic modulus different mix ratios ages, also observed microscopic morphology samples by using scanning electron microscope. The results show that addi...
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