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 Flexural strength of silica fume, fly ash, and metakaolin of hardened cement paste after exposure to elevated temperatures

2021 ◽  
Author(s):  
Nabil Abdelmelek ◽  
Eva Lubloy
Keyword(s):  
Fly Ash ◽  
Silica Fume ◽  
Cement Paste ◽  
Elevated Temperatures ◽  
The Other ◽  
Hardened Cement ◽  
Hardened Cement Paste ◽  
Structural Element ◽  
Pozzolanic Material ◽  
Pozzolanic Materials

AbstractThe mechanical properties of concrete based mainly on flexural and compressive bearing capacity. Generally, researchers have an interest in the evaluation of compression property through the importance of the flexural performance of the material in the constructions, namely the significance of each mechanical property based upon the position of the structural element. The present experimentally work is directed toward improving the flexural strengths performance of ordinary hardened cement paste (HCP) at ambient and after elevated temperatures exposure. The used parameters were different pozzolanic materials with different replacements ratios to cement mass and different levels of temperature. Results proved the significant contribution of pozzolanic material to enhance the flexural properties of HCP after being exposed to elevated temperatures. The low content of CaO, the high grinding fineness, and the physical morphology of the used pozzolanic materials, made their adoption effective to HCP after exposure to elevated temperatures. Using 3%, 12%, and 15% of silica fume (SF), metakaolin (MK), and fly ash (FA), respectively, showed the highest heat endurance among the other replacements. However, the optimum replacement of MK has shown a better heat endurance than the optimum replacements of SF and FA. On the other hand, the spalling has occurred at high replacements of SF. Finally, the results are supported by means of thermo-gravimetric, SEM, and computed tomography investigations.

Electrical Resistivity and Dielectric Properties of Hardened Cement Paste and Mortar

1995 ◽  
Vol 411 ◽  
Author(s):  
D. Buerchler ◽  
B. Elsener ◽  
H. Boehni
Keyword(s):  
Electrical Resistivity ◽  
Dielectric Properties ◽  
Water Content ◽  
Cement Paste ◽  
Pore Solution ◽  
Hardened Cement ◽  
Hardened Cement Paste ◽  
Solution Composition ◽  
Cement Based Materials

ABSTRACTWater content, porosity, pore solution composition, resistivity and dielectric properties of hardened cement paste and mortar samples have been studied as a function of time and relative humidities. A model for the resistivity of cement based materials is presented and an interpretation of the dielectric properties is proposed.

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