The impact of cement parameters on Delayed Ettringite Formation

2012 ◽  
Vol 34 (4) ◽  
pp. 521-528 ◽  
Author(s):  
A. Pavoine ◽  
X. Brunetaud ◽  
L. Divet
Keyword(s):  
Delayed Ettringite Formation ◽  
Ettringite Formation ◽  
The Impact

The impact of sulfate- and sulfide-bearing sand on delayed ettringite formation

2021 ◽  
pp. 104323
Author(s):  
Alvaro Paul ◽  
Mehdi Rashidi ◽  
Jin-Yeon Kim ◽  
Laurence J. Jacobs ◽  
Kimberly E. Kurtis
Keyword(s):  
Delayed Ettringite Formation ◽  
Ettringite Formation ◽  
The Impact

The impact of Fe dosage on the ettringite formation during high ferrite cement hydration

2020 ◽  
Author(s):  
Dawei Wan ◽  
Wenqin Zhang ◽  
Yong Tao ◽  
Zonghua Wan ◽  
Fazhou Wang ◽  
...  
Keyword(s):  
Cement Hydration ◽  
Ettringite Formation ◽  
The Impact

Heat treatment of fresh concrete by radio waves – Avoiding delayed ettringite formation

2017 ◽  
Vol 143 ◽  
pp. 580-588 ◽  
Author(s):  
Björn Höhlig ◽  
Christof Schröfl ◽  
Simone Hempel ◽  
Ina Noack ◽  
Viktor Mechtcherine ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Fresh Concrete ◽  
Radio Waves ◽  
Delayed Ettringite Formation ◽  
Ettringite Formation

scholarly journals Risk analysis of the delayed ettringite formation in pile caps foundation in the metropolitan region of Recife - PE - Brasil

2016 ◽  
Vol 9 (3) ◽  
pp. 357-394 ◽  
Author(s):  
I. F. Torres ◽  
T. Andrade
Keyword(s):  
Risk Analysis ◽  
Metropolitan Region ◽  
Hardened Concrete ◽  
Chemical Compositions ◽  
Delayed Ettringite Formation ◽  
Ettringite Formation ◽  
Pile Caps ◽  
Foundation Pile ◽  
Physical And Chemical

ABSTRACT Currently, there is an awareness that is critical to assess the durability characteristics of concrete with as much attention as the mechanical properties. The durability of concrete structures can often be affected by chemical attacks, jeopardizing its performance and security. When concrete is subjected to high temperature at early ages, many physical and chemical changes in hardened concrete may occur. It iswidely accepted that concrete subjected to these conditions of temperature and exposed to moisture is prone to cracking due to Delayed Ettringite Formation (DEF). This work aims at providing a DEF risk analysis on foundation pile caps at the Metropolitan Region of Recife - PE. Temperature rise measurement was performed in situ at 5 different caps through datalogger and thermocouples equipments. Furthermore, the Duggan test was performed in order to assess the level of expansion of 3 cements studied: X (CP II E 40), Y (CP II F 32) and Z (CP V ARI RS). Simultaneously, the chemical compositions of these cements and their respective clinkers were quantified by analysis of X-ray fluorescence (XRF). The cement X (CP II E 40) showed the chemical characteristics favoring with more intensity DEF and, as a result, higher level of expansion in the test Duggan. It is noteworthy that incorporation of metakaolin (8% and 16%) and silica fume (5% and 10%) showed mitigating potential of expansions. It is important to point out that all factors related to thermal properties and chemical composition of the concrete used in the region converge to a condition of ideal susceptibility for triggering DEF. Therefore, it is essential at least minimum and basic requirements in the design specification in order to avoid high temperatures in the massive concrete elements, preventing them from delayed ettringite formation.

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