Methods to evaluate resistance of cement-based materials against microbially induced corrosion: A state-of-the-art review

2021 ◽  
pp. 104208
Author(s):  
Linping Wu ◽  
Guangping Huang ◽  
Wei Victor Liu
Keyword(s):  
State Of The Art ◽  
Microbially Induced Corrosion ◽  
Cement Based Materials

scholarly journals A review on the properties, reinforcing effects, and commercialization of nanomaterials for cement-based materials

2020 ◽  
Vol 9 (1) ◽  
pp. 303-322 ◽  
Author(s):  
Zhifang Zhao ◽  
Tianqi Qi ◽  
Wei Zhou ◽  
David Hui ◽  
Cong Xiao ◽  
...  
Keyword(s):  
Cement Hydration ◽  
State Of The Art ◽  
Research Progress ◽  
Market Survey ◽  
Future Perspectives ◽  
Nano Silica ◽  
Physical Processes ◽  
Existing Problems ◽  
Cement Based Materials ◽  
The Cost

AbstractThe behavior of cement-based materials is manipulated by chemical and physical processes at the nanolevel. Therefore, the application of nanomaterials in civil engineering to develop nano-modified cement-based materials is a promising research. In recent decades, a large number of researchers have tried to improve the properties of cement-based materials by employing various nanomaterials and to characterize the mechanism of nano-strengthening. In this study, the state of the art progress of nano-modified cement-based materials is systematically reviewed and summarized. First, this study reviews the basic properties and dispersion methods of nanomaterials commonly used in cement-based materials, including carbon nanotubes, carbon nanofibers, graphene, graphene oxide, nano-silica, nano-calcium carbonate, nano-calcium silicate hydrate, etc. Then the research progress on nano-engineered cementitious composites is reviewed from the view of accelerating cement hydration, reinforcing mechanical properties, and improving durability. In addition, the market and applications of nanomaterials for cement-based materials are briefly discussed, and the cost is creatively summarized through market survey. Finally, this study also summarizes the existing problems in current research and provides future perspectives accordingly.

Microcrack Study of Cement-Based Materials by Means of Image Analysis

1994 ◽  
Vol 370 ◽  
Author(s):  
Yahia Alhassani ◽  
Alain Bascoul ◽  
Erick Ringot
Keyword(s):  
Image Analysis ◽  
State Of The Art ◽  
Concrete Surface ◽  
Hydraulic Structures ◽  
Replica Technique ◽  
Cement Based Materials ◽  
Basic Issue ◽  
The Relationship ◽  
Non Destructive ◽  
Method Of Extraction

AbstractThe relationship between microscopical damaging of concrete and its mechanical parameters such as Young's modulus and degree of reversibility is a basic issue. In the same time, transport properties and of course the durability of civil engineering and hydraulic structures are linked to the state of microcracking.The replica technique has been developed in our laboratory in order to study microcracks with a scanning electron microscope. This non-destructive method allows observation of the imprint of the concrete surface and to follow the evolution of the alterations with time. An objective quantitative analysis requires numerous replicas and many microscopic fields within each replica.After a brief state of the art of the automatic method of extraction of lines by image processing, we propose a specific algorithm of image analysis which allows the cleaning of the pictures and the extraction of the microcrack skeleton. Today, this procedure has been validated on cement paste samples. It has to be improved to be applied on concrete.The measured parameters are the microcrack specific lengths and their orientation. The objective values measured by means of this procedure compare favorably to results obtained by hand drawing.

scholarly journals Application of super absorbent polymers (SAP) in concrete construction—update of RILEM state-of-the-art report

2021 ◽  
Vol 54 (2) ◽  
Author(s):  
Viktor Mechtcherine ◽  
Mateusz Wyrzykowski ◽  
Christof Schröfl ◽  
Didier Snoeck ◽  
Pietro Lura ◽  
...  
Keyword(s):  
State Of The Art ◽  
Research Work ◽  
Major Product ◽  
The State ◽  
Chemical Admixtures ◽  
Cement Based Materials ◽  
International Experts ◽  
Important Progress ◽  
Made In ◽  
Working Mechanisms

AbstractSuperabsorbent polymers (SAP) are a new, promising class of chemical admixtures which offer new possibilities in respect of influencing the properties of cement-based materials in the fresh, hardening, and hardened states. Much research work has been done in the last two decades to set the stage for introducing this truly multipurpose agent into the practice of construction. In particular, three RILEM Technical Committees: 196-ICC, 225-SAP and 260-RSC contributed considerably to the related progress by coordinating and combining the efforts of international experts in the field. The major product of the RILEM TC 225-SAP work was the State-of-the-Art Report published in 2012. This comprehensive document covered all topics relevant to the application of SAP as a concrete admixture. Since then further important progress has been made in understanding the working mechanisms of SAP in concrete and the effects of SAP-addition on various concrete properties. The article at hand presents an update on the state-of-the-art and is the concluding document delivered by the RILEM TC 260-RSC.

scholarly journals Thixotropic structural build-up of cement-based materials: A state-of-the-art review

2021 ◽  
pp. 104152
Author(s):  
Dengwu Jiao ◽  
Robin De Schryver ◽  
Caijun Shi ◽  
Geert De Schutter
Keyword(s):  
State Of The Art ◽  
Cement Based Materials

Practical Picture Processing

1974 ◽  
Vol 32 ◽  
pp. 338-339
Author(s):  
T. A. Welton
Keyword(s):  
Radiation Damage ◽  
Coherence Length ◽  
Spatial Information ◽  
State Of The Art ◽  
Coherent Radiation ◽  
The State ◽  
Energy Spread ◽  
Electron Micrograph ◽  
Picture Processing ◽  
Molecular Skeleton

Various authors have emphasized the spatial information resident in an electron micrograph taken with adequately coherent radiation. In view of the completion of at least one such instrument, this opportunity is taken to summarize the state of the art of processing such micrographs. We use the usual symbols for the aberration coefficients, and supplement these with £ and 6 for the transverse coherence length and the fractional energy spread respectively. He also assume a weak, biologically interesting sample, with principal interest lying in the molecular skeleton remaining after obvious hydrogen loss and other radiation damage has occurred.

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