Destructive and Nondestructive Evaluation of Frost Resistance of Cement Pastes with Fly Ash

2016 ◽  
Vol 827 ◽  
pp. 296-299
Author(s):  
Ondřej Zobal ◽  
Pavel Padevět ◽  
Tomáš Plachy
Keyword(s):  
Fly Ash ◽  
Nondestructive Evaluation ◽  
Frost Resistance ◽  
High Volume ◽  
Economic Benefits ◽  
Cement Pastes ◽  
Fly Ash Concrete ◽  
High Volume Fly Ash ◽  
Cement And Concrete ◽  
Non Destructive

This paper is dedicated to the use of fly ash in cement and concrete. Using fly ash in cement and concrete has ecological and economic benefits. However, it is important to correctly apply the fly ash. If the substitution is close to 50% or more by weight of clinker (HVFAC - High-Volume Fly Ash Concrete), it is necessary to monitor the material and mechanical properties. This paper describes an analysis of a frost resistance of a cement paste with fly ash. The destructive and non-destructive tests were carried out.

Beneficial Use of Fly Ash in Concrete Incorporating PCA

2010 ◽  
Vol 152-153 ◽  
pp. 708-712
Author(s):  
Ya Qing Jiang ◽  
Jia Yu ◽  
Qian Feng Xia
Keyword(s):  
Fly Ash ◽  
Zeta Potential ◽  
High Volume ◽  
Loss On Ignition ◽  
Self Compacting Concrete ◽  
Cement Pastes ◽  
Degree Of Hydration ◽  
Fly Ash Concrete ◽  
Dispersion Mechanism ◽  
High Volume Fly Ash

Dispersion mechanism of polycarboxylate type admixture (PCA) in high volume fly ash (HVFA) concrete was studied by testing fluidity of cement paste, zeta potential of cement grains, the adsorbed amount of PCA on surfaces of cement grains and degree of hydration was quantified by loss on ignition measurements. Properties of HVFA concrete were experimentally validated, and microstructure of HVFA concrete was observed by SEM. Experimental results indicated that a combination of PCAs with long and short backbones may enhance the fluidity and fluidity retention of cement pastes. Fly ash has the ability to compensate electrostatic repulsion of PCA by promoting adsorption-dispersion of PCA to cement minerals and making zeta potential of cement grains more negative. HVFA concrete incorporating combined PCA has excellent workability and appropriate strength. Microstructure of HVFA self-compacting concrete is denser for the modified homogeneous of concrete and a higher degree of hydration of cement achieved in the presence of PCA and fly ash. So combined polycarboxylate based admixture is absolutely necessary for producing high volume fly ash concrete with better workability and durability.

Long term mechanical performance of nano-engineered high volume fly ash concrete

2021 ◽  
pp. 103168
Author(s):  
Charith Herath ◽  
Chamila Gunasekara ◽  
David W. Law ◽  
Sujeeva Setunge
Keyword(s):  
Fly Ash ◽  
Mechanical Performance ◽  
High Volume ◽  
Fly Ash Concrete ◽  
High Volume Fly Ash
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