Impact of accelerating admixtures on the electrical properties of ordinary portland cement pastes

被引:3
作者
Montanari, Luca [1 ,2 ]
Helsel, Michelle [3 ]
de la Varga, Igor [4 ]
Spragg, Robert [5 ]
Juenger, Maria [2 ]
机构
[1] SES Grp & Associates LLC, Turner Fairbank Highway Res Ctr, Mclean, VA 22101 USA
[2] Univ Texas Austin, Cockrell Sch Engn, Austin, TX 78712 USA
[3] Engn & Software Consultants Inc, Turner Fairbank Highway Res Ctr, Mclean, VA 22101 USA
[4] CarbonCure Technol, Appl Customer Solut, Herndon, VA 20171 USA
[5] US Dept Transportat, Washington, DC 20590 USA
关键词
Electrical properties; Accelerators; Pore solution; Resistivity; Formation factor; Porosity; RESISTIVITY MEASUREMENTS; CONCRETE; HYDRATION; CHLORIDE;
D O I
10.1016/j.cemconcomp.2022.104651
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Electrical resistivity is a reliable concrete testing tool that agencies, researchers, and contractors have adopted to quickly assess the transport properties of cementitious systems. Like other electrically-based tests, resistivity measurements can be influenced, among other factors, by the ions dissolved in the pore solution of cementitious systems. To isolate the pore solution component, some researchers have suggested the implementation of the formation factor, which accounts for the system's pore solution. Among the mixture constituents potentially affecting the pore solution, accelerating admixtures are thought to have significant effects. Due to the lack of pore solution data, the community has come to mistrust any electrically-based test performed on concrete mixtures that include this kind of admixture. This study aims to improve the understanding of the effect that four different types of accelerating admixtures have on the electrical properties of an ordinary portland cement paste system. The data show that the influence of accelerating admixtures on the pore solution lessens over time. Moreover, development rates in the degree of hydration and the porosity of the system are found to be signif-icantly affected by the chemistry of the admixture. Both electrical resistivity and formation factor are found to have high correlation with the total porosity of systems with and without accelerating admixtures.
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页数:9
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