Results 41 to 50 of about 387,480 (278)
EPJ Web of Conferences, 2017 Superplasticizers are chemical admixtures used to fluidize cement pastes. Among them, polycarboxylate are comb-like copolymers with carboxylic acid and poly(ethylene glycol) side chains.
Tramaux A. +6 more
doaj +1 more source
Scientific Reports, 2023 The water–cement/binder ratio and the admixture of water-reducing agents strongly affect the rheological properties of cement pastes. This study develops mathematical models to predict the apparent viscosity of cement pastes with varying water-cement ...
Yong Yuan +5 more
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Application and research review of cemented carbide heterogeneous brazing coating additive manufacturing [PDF]
arXiv, 2022 As one of the important methods for surface modification of materials and life extension of key components, cemented carbide brazing coatings are widely used in agricultural machinery, oil drilling, aerospace and other fields, it has also attracted the attention of scholars in the field of surface modification at home and abroad.
arxiv
The effect of die spacer on retention and fitting of complete cast crowns
Journal of Craniomaxillofacial Research, 2022 Purpose: Loss of the bracket-tooth bond is one of the most common complaints of patients during orthodontic treatment. Various factors play a role in preventing the loss of such a strong bond between the bracket and tooth, one of which is the ...
Mohammad Reza Hajimahmoudi +3 more
doaj
Research on performance of new type cement slurry for water shutoff in coal mine roadway
Meikuang Anquan, 2021 In view of the problem that the water gushing problem of deep coal mine roadway seriously affects the safety of coal mine construction, and the common cement grout is difficult to seal up the tiny rock cracks, the micron-grade fly ash is used to replace
LIU Huini, LI Xungang, LI Yanzhi, ZHANG Shuai, CHEN Pengcheng, WU Yue, FAN Zhenwang, TANG Chao
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Developments In Orthodontıc Cements
Turkish Journal of Orthodontics, 1994 In this literature review dental cements which were used for banding orthodontic attachments to teeth were evaluated. The general properties of zincphosphate cement, polycarboxylate cement and recently developed glass ionomer cements were discussed.
İlken Kocadereli
doaj +1 more source
ZrO2 nanoparticles' effects on split tensile strength of self compacting concrete
Materials Research, 2010 In the present study, split tensile strength of self compacting concrete with different amount of ZrO2 nanoparticles has been investigated. ZrO2 nanoparticles with the average particle size of 15 nm were added partially to cement paste (Portland cement ...
Ali Nazari, Shadi Riahi
doaj +1 more source
A note on cement in asteroids [PDF]
Icarus 275, 249 (2016), 2016 Cement mineral tobermorite was formed in hydrothermal experiments on alternation of calcium-aluminum-rich inclusions (CAIs) in carbonaceous chondrite meteorites. Unidentified bands at 14 microns were measured for CAIs and the matrix of the Allende meteorite sample, as well as for Hektor and Agamemnon asteroids.
arxiv +1 more source
The application of Nano-silica gel in sealing well micro-annuli and cement channeling [PDF]
arXiv, 2023 The possibility for hydrocarbon fluids to migrate through debonded micro-annuli wells is a major concern in the petroleum industry. With effective permeability of 0.1-1.0 mD, the existence of channels in a cement annulus with apertures of 10-300 micrometer constitutes a major threat. Squeeze cement is typically difficult to repair channels-leakage with
arxiv
From Ancient Techniques to Modern Solutions: In Situ Synthesis of C‐S‐H for Sandstone Conservation
Advanced Science, EarlyView.Herein, this work presents a paleo‐inspired approach to synthesizing and optimizing C‐S‐H‐based grouting mortars for conserving the sandstone of Beishan Grottoes, Dazu Rock Carvings, China. By achieving an optimal recipe compatible with natural sandstone, this work demonstrates the pivotal role of hydrogen bonding in the adhesion between C‐S‐H mortars ...
Mengjun Jia +9 more
wiley +1 more source