نتایج جستجو برای: cement content

تعداد نتایج: 440472  

Journal: :Sustainability 2022

All types of concrete contain residual unhydrated cement. For example, cement is present in high-strength due to low water/cement ratios, as well old coarser used the past, and fresh waste lack curing. These residues are a resources with potential for recovery reuse. In this work, X-ray diffraction, thermogravimetric analysis, analytical modeling were quantify hydration degree various pastes ex...

2017
Muhammad Nasir Amin Kaffayatullah Khan Muhammad Umair Saleem Nauman Khurram Umar Khan Niazi

In this study, the influence of mechanically activated electric arc furnace slag (EAFS) was investigated through compressive strength tests on 50 mm mortar cubes. The objective was to convert the wasteful EAFS into a useful binding material to reduce the cement content in concrete without compromising strength and economy. Four different groups of mortar were cast which include control mortar, ...

2013
Floriberto Díaz-Díaz Prisciliano F. de J. Cano-Barrita Bruce J. Balcom Sergio E. Solís-Nájera Alfredo O. Rodríguez

In cement-based materials porosity plays an important role in determining their mechanical and transport properties. This paper describes an improved low–cost embeddable miniature NMR sensor capable of non-destructively measuring evaporable water loss and porosity refinement in low and high water-to-cement ratio cement-based materials. The sensor consists of two NdFeB magnets having their North...

2016
Antonio López-Uceda Jesús Ayuso José Ramón Jiménez Francisco Agrela Auxiliadora Barbudo Jorge De Brito

This research aims to produce non-structural concrete with mixed recycled aggregates (MRA) in upscaled applications with low-cement content. Four slabs were executed with concrete made with different ratios of coarse MRA (0%, 20%, 40% and 100%), using the mix design, the mixing procedures and the facilities from a nearby concrete production plant. The analysis of the long-term compressive and s...

2012
Erik Unosson Yanling Cai Xiyuan Jiang Jesper Lööf Ken Welch Håkan Engqvist

A modified direct contact test was used to evaluate the antibacterial properties of four commercially available dental luting agents (RelyX Unicem, Ketac Cem, Ceramir Crown & Bridge and Harvard Cement) and two reference materials (glass-ionomer cement and calcium aluminate cement) compared to a negative-control material (PMMA). Streptococcus mutans bacteria were placed in direct contact with sp...

Journal: :Environmental science & technology 2014
Jun Wang Josh Hayes Chang-Yu Wu Timothy Townsend John Schert Tim Vinson Katherine Deliz Jean-Claude Bonzongo

The fate of mercury (Hg) in cement processing and products has drawn intense attention due to its contribution to the ambient emission inventory. Feeding Hg-loaded coal fly ash to the cement kiln introduces additional Hg into the kiln's baghouse filter dust (BFD), and the practice of replacing 5% of cement with the Hg-loaded BFD by cement plants has recently raised environmental and occupationa...

Journal: :Pediatric dentistry 1999
T P Croll

Use of Vitremer Core Buildup/Restorative Cement (3M Dental Products Division) as a luting cement for orthodontic bands and space maintainers was described in 1994. For use as a luting agent, the restorative cement is mixed with a slightly lower powder liquid ratio so the blend is more fluid than one used for a dental restoration. A chief advantage of using Vitremer Restorative Cement for luting...

2016
Wei Sun Aixiang Wu Kepeng Hou Yi Yang Lei Liu Yiming Wen

The integrated disposal of surface subsidence pits and surface solid waste can be realized by backfilling a surface subsidence area with a paste made from the solid wastes of mines, such as tailings and waste rock. The microstructures of these wastes determine the macroscopic properties of a paste backfill. This paper presents an experimental study on the internal structure evolution of pasty f...

2015
Isamu Yoshitake Takeo Ishida Sunao Fukumoto

Recyclable concrete pavement was made from fly ash and crushed limestone sand and gravel as aggregates so that the concrete pavement could be recycled to raw materials for cement production. With the aim to use as much fly ash as possible for the sustainable development of society, while achieving adequate strength development, pavement concrete having a cement-replacement ratio of 40% by mass ...

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