Causes of Blistering in Plastic Coatings on Screeds and Concrete

2021 ◽  
Vol 109 ◽  
pp. 53-58
Author(s):  
Ulrich Diederichs ◽  
Sandra Jäntsch ◽  
Dorothea Sklenářová
Keyword(s):  
Osmotic Pressure ◽  
Chemical Reactions ◽  
Alkali Silica Reaction ◽  
Synthetic Resin

In the course of repairs or upgrading measures, it is often necessary to provide floors with synthetic resin coatings. After the work has been carried out, bubbles may form. The article lists the various mechanisms that cause blistering (osmotic pressure, impurities in the aggregate of the screed or concrete, chemical reactions, e.g. alkali silica reaction). By aid of a case study, the procedure for determining the causes of blistering is given in more detail. The investigations have shown that the formation of bubbles was due to alkali-silica reactions of opal sandstone particles in the screed.

Determination of the elastic properties of amorphous materials: Case study of alkali–silica reaction gel

2013 ◽  
Vol 54 ◽  
pp. 55-60 ◽  
Author(s):  
Juhyuk Moon ◽  
Sergio Speziale ◽  
Cagla Meral ◽  
Bora Kalkan ◽  
Simon M. Clark ◽  
...  
Keyword(s):  
Elastic Properties ◽  
Amorphous Materials ◽  
Alkali Silica Reaction

Modeling of Chemical Reactions in Micelle: Water-Mediated Keto–Enol Interconversion As a Case Study

2011 ◽  
Vol 115 (25) ◽  
pp. 8102-8111 ◽  
Author(s):  
Paolo Marracino ◽  
Andrea Amadei ◽  
Francesca Apollonio ◽  
Guglielmo d’Inzeo ◽  
Micaela Liberti ◽  
...  
Keyword(s):  
Chemical Reactions

scholarly journals A Bond Bundle Case Study of Diels-Alder Catalysis Using Oriented Electric Fields

2022 ◽  
Author(s):  
Timothy Wilson ◽  
Mark Eberhart
Keyword(s):  
Electric Field ◽  
Charge Density ◽  
Electric Fields ◽  
Chemical Reactions ◽  
Catalytic Effect ◽  
Reaction Pathway ◽  
Three Dimensional ◽  
Atomic Charge ◽  
Diels Alder

Bond bundles are chemical bonding regions, analogous to Bader atoms, uniquely defined according to the topology of the gradient bundle condensed charge density, itself obtained by a process of infinitesimal partitioning of the three-dimensional charge density into differential zero-flux surface bounded regions. Here we use bond bundle analysis to investigate the response of the charge density to an oriented electric field in general, and the catalytic effect of such a field on Diels-Alder reactions in particular, which in this case is found to catalyze by allowing the transition state valance bond bundle configuration to be achieved earlier along the reaction pathway. Using precise numerical values, we arrive at the conclusion that chemical reactions and electric field catalysis can be understood in terms of intra-atomic charge density redistribution, i.e., that charge shifts within more so than between atoms account for the making and breaking of bonds.

scholarly journals A Bond Bundle Case Study of Diels-Alder Catalysis Using Oriented Electric Fields

2021 ◽  
Author(s):  
Timothy Wilson ◽  
Mark Eberhart
Keyword(s):  
Electric Field ◽  
Charge Density ◽  
Electric Fields ◽  
Chemical Reactions ◽  
Catalytic Effect ◽  
Reaction Pathway ◽  
Three Dimensional ◽  
Atomic Charge ◽  
Diels Alder

Bond bundles are chemical bonding regions, analogous to Bader atoms, uniquely defined according to the topology of the gradient bundle condensed charge density, itself obtained by a process of infinitesimal partitioning of the three-dimensional charge density into differential zero-flux surface bounded regions. Here we use bond bundle analysis to investigate the response of the charge density to an oriented electric field in general, and the catalytic effect of such a field on Diels-Alder reactions in particular, which in this case is found to catalyze by allowing the transition state valance bond bundle configuration to be achieved earlier along the reaction pathway. Using precise numerical values, we arrive at the conclusion that chemical reactions and electric field catalysis can be understood in terms of intra-atomic charge density redistribution, i.e., that charge shifts within more so than between atoms account for the making and breaking of bonds.

Alkali-Silica Reaction in Concrete Caused by Densified Silica Fume Lumps: A Case Study

2000 ◽  
Vol 22 (2) ◽  
pp. 90 ◽  
Author(s):  
RD Hooton ◽  
SL Marusin ◽  
LB Shotwell
Keyword(s):  
Silica Fume ◽  
Alkali Silica Reaction
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