The relation between concrete, mortar and paste scale early age properties

Klun, Martin (author), Bosiljkov, Vlatko (author), Bokan-Bosiljkov, Violeta (author)

Microstructure development of concrete, mortar, and paste scale of cement-based material (CBM) during the early hydration stage has a significant impact on CBM’s physical, mechanical, and durability characteristics at the high maturity state. The research was carried out using compositions with increased autogenous shrinkage and extended early age period, proposed within the RRT$^+$ programme of the COST Action TU1404. The electrical conductivity method, used to follow the solidification process of CBM, is capable of determining the initial and final setting time, and the end of the solidification process acceleration stage for the paste and mortar scale. Simultaneous ultrasonic P- and S-wave transmission measurements revealed that the ratio of velocities V$_P$/V$_S$ is highly dependent on the presence of aggregates—it is considerably higher for the paste scale compared to the mortar and concrete scale. The deviation from the otherwise roughly constant ratio V$_P$/V$_S$ for each scale may indicate cracks in the material. The non-linear correlation between the dynamic and static elastic moduli valid over the three scales was confirmed. Additionally, it was found that the static E-modulus correlates very well with the square of the V$_S$ and that the V$_S$ is highly correlated to the cube compressive strength—but a separate trendline exists for each CBM scale.

• Language: English
• Keywords: concrete, mortar and paste scale of cement-based material, early hydration stage, microstructure development, electrical conductivity, ultrasonic method, standard tests
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2021
• Number of pages: 24 str.
• Numbering: Vol. 14, iss. 6, art. 1569
• PID: 20.500.12556/RUL-127258
• UDC: 620.1:691
• ISSN on article: 1996-1944
• DOI: 10.3390/ma14061569
• COBISS.SI-ID: 57744899
• Publication date in RUL: 31.05.2021

Record is a part of a journal

• Title: Materials
• Shortened title: Materials
• Publisher: MDPI
• ISSN: 1996-1944
• COBISS.SI-ID: 33588485

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 23.03.2021

Secondary language

• Language: Slovenian
• Keywords: beton, nivo malte in paste v betonu, zgodnja starost, razvoj mikrostrukture, električna prevodnost, ultrazvočna metoda, standardni testi