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Inverkan av torktemperatur vid vattenmättning av bruk och betong: Bestämmning av vattenmättnadsgrad och hydraulisk konduktivitet
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Mechanics, Byggteknik.
2016 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Today, there is uncertainty about how much the results differ when drying concrete

at 20, 50 and 105 °C prior to saturation of concrete in order to determine the

degree of saturation and hydraulic conductivity. Micro-cracks occur when concrete is

dried at higher temperatures and causes increased hydraulic conductivity. Further, the

concrete is believed not to be completely saturated if not all the physically bound

water, so called free water, has been dried out prior to saturation.

This thesis compares the effect of three different drying temperatures on the

possibility to saturate concrete with water. The work was conducted at Vattenfall’s

concrete laboratory in Älvkarleby. The three drying temperatures were +20 °C

(room temperature), 50 °C and +105 °C. The objective was to determine if

differences on the degree of saturation and hydraulic conductivity were non-existent

or negligible. Vacuum saturation after drying at 105 °C is considered to be complete.

The results after drying at 20 °C and 50 °C were compared to those after drying at

105 °C. The results of the tests indicate that the concrete should be dried at +105°C

prior to saturation with water. Then the risk of frost damage to concrete in hydro

power structures can be assessed.

How determination of the hydraulic conductivity is affected by the drying

temperature gave more vague and dubious results. All specimens showed a maximum

hydraulic conductivity after drying at 50 °C, not after 105 °C as expected. It was

believed that the hydraulic conductivity theoretically would increase because of

(more) micro-cracks when being dried at 105 °C. Results from the concrete with vct

1.0 gave results that indicated that the specimens had been damaged by method 1. To

sum up, the results of the tests indicate that further studies on the effects of drying

temperatures should be made.

Place, publisher, year, edition, pages
2016. , 61 p.
National Category
Marine Engineering Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-302575ISRN: UTH-INGUTB-EX-B-2016/29-SEOAI: oai:DiVA.org:uu-302575DiVA: diva2:958221
Educational program
Bachelor Programme in Construction Engineering
Supervisors
Examiners
Available from: 2016-09-07 Created: 2016-09-06 Last updated: 2016-09-07Bibliographically approved

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