scholarly journals IMAGE ANALYSIS OF HARDENED CEMENT PASTE MIXED FLY ASH BY USING BACKSCATTER ELECTRON IMAGE AND ENERGY DISPERSIVE X-RAY ANALYSIS

2006 ◽  
Vol 71 (603) ◽  
pp. 1-7
Author(s):  
Kiyofumi KURUMISAWA ◽  
Toyoharu NAWA ◽  
Keyword(s):  
Image Analysis ◽  
Fly Ash ◽  
Cement Paste ◽  
Energy Dispersive ◽  
Backscatter Electron Image ◽  
Hardened Cement ◽  
Backscatter Electron ◽  
Hardened Cement Paste ◽  
X Ray ◽  
Electron Image

Density mapping of hardened cement paste using ptychographic X-ray computed tomography

2013 ◽  
Vol 36 ◽  
pp. 71-77 ◽  
Author(s):  
Pavel Trtik ◽  
Ana Diaz ◽  
Manuel Guizar-Sicairos ◽  
Andreas Menzel ◽  
Oliver Bunk
Keyword(s):  
Computed Tomography ◽  
Cement Paste ◽  
Hardened Cement ◽  
Hardened Cement Paste ◽  
X Ray ◽  
Density Mapping ◽  
X Ray Computed

Influence of Water Content in the Hardened Cement Paste Mixtures with Different Proportion of Fly Ash on the Material and Mechanical Properties

2013 ◽  
Vol 486 ◽  
pp. 319-322
Author(s):  
Ondřej Zobal ◽  
Pavel Padevět
Keyword(s):  
Fly Ash ◽  
Water Content ◽  
Cement Paste ◽  
Volume Density ◽  
Hardened Cement ◽  
Average Amount ◽  
Hardened Cement Paste ◽  
The Czech Republic ◽  
Influence Of Water ◽  
Current Standards

Above average amount of fly ash production in the Czech Republic compels us to process it. Part of this waste material has some potential for use in various industries. The largest part is used in construction. One option is the use of larger replacement of cement with fly ash than as required by current standards. This paper is dedicated to the cement paste with different fly ash cement replacement. Specifically, are observed properties of hardened mixtures depending on the water content. There are presented the results of measurements of volume density and compressive strength.

scholarly journals Modifying admixtures to cement compositions produced from local raw materials

2018 ◽  
Vol 143 ◽  
pp. 02006
Author(s):  
Daria Vasileva ◽  
Egor Protodiakonov ◽  
Anastasia Egorova ◽  
Svetlana Antsupova
Keyword(s):  
Cement Paste ◽  
Raw Materials ◽  
Mineralogical Composition ◽  
Raw Material ◽  
Free Calcium ◽  
Hardened Cement ◽  
X Ray Diffraction ◽  
Hardened Cement Paste ◽  
X Ray ◽  
Insoluble Compounds

Durability of hardened cement paste depends on chemical and mineralogical composition of Portland cement. The main factor for hardened cement paste is higher content of calcium aluminate and free calcium hydroxide, binding of which into water-insoluble compounds causes increase in resistance to water, frost and corrosion. The purpose of this research is to develop modifying admixtures to cement compositions based on local raw material - rock sand. Chemical and mineralogical properties of the source materials were studied using X-ray spectroscopy and X-ray diffraction analysis. Standard methods were used for defining physico-mechanical properties of sand and binder. Influence of the degree of mechanochemical activation of modifying admixture on the properties of binder and hardened cement paste made on its basis was studied. Research methods of scanning electron microscopy and spectral measurements were applied. The possibility of using admixture based on rock sand as a modifier was determined, its usage providing increase of strength, sulphate and frost resistance, which causes higher durability of cement concrete.

scholarly journals Effects of chloride ions on carbonation rate of hardened cement paste by X-ray CT techniques

2016 ◽  
Vol 122 ◽  
pp. 619-627 ◽  
Author(s):  
Jun-zhe Liu ◽  
Ming-fang Ba ◽  
Yin-gang Du ◽  
Zhi-min He ◽  
Jian-bin Chen
Keyword(s):  
Cement Paste ◽  
Chloride Ions ◽  
Hardened Cement ◽  
Hardened Cement Paste ◽  
X Ray
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