Vpliv notranjih rezervoarjev vode na krčenje betona visoke trdnosti

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Language:	Slovenian
Year of publishing:	2013
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FGG - Faculty of Civil and Geodetic Engineering
Publisher:	[G. Drčar]
UDC:	624.012.4(043.2)
COBISS:	6395233
Views:	2036
Downloads:	533
Average score:	0 (0 votes)
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Secondary language:	English
Secondary title:	Impact of internal water reservoirs on shrinkage of high strength concrete
Secondary abstract:	High strength concrete has lower water-cement ratio compared to regular concrete, which allows higher strength of the concrete. Because of low water-cement ratio, there is a lack of water during the process of hydration.During the transport of water from the capillary pores of concrete, high forces to the structure of the hardening cement paste were created. Because of this forces, the concrete shrinks, which creates cracks and therefore reduces durability of the concrete elements. In this bachelors thesis we analyzed the impacts of internal water reservoirs on high strength concrete shrinkage. Lightwight aggregate of fractions from 0 to 2 millimeters was pre-soaked and used for internal water reservoir. We used 12% of the pre-soaked lightweight aggregate in our analyzed concrete mix. Shrinkage of our experimental concrete mix was then analyzed and compared to shrinkage of concrete HSC 1600 which was analyzed in Assist. Prof. Drago Saje's PhD thesis. Compressive strength of concrete was also measured in the process. We found out that we can partially reduce concrete shrinkage process with the use of lightweight aggregate with fractions from 0 to 2 millimeters and also improve its compressive strength.
Secondary keywords:	high strength concrete;concrete shrinkage;compressive strength;water-cement ratio;internal water reservoirs
File type:	application/pdf
Type (COBISS):	Bachelor thesis/paper
Thesis comment:	Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Pages:	X, 31 str.
Type (ePrints):	thesis
Title (ePrints):	Impact of internal water reservoirs on shrinkage of high strength concrete
Keywords (ePrints):	avtogeno krčenje;beton visoke trdnosti;hidratacija cementa;notranja nega betona;lahki agregati
Keywords (ePrints, secondary language):	high strength concrete;concrete shrinkage;compressive strength;water-cement ratio;internal water reservoirs
Abstract (ePrints):	Betoni visoke trdnosti imajo, v primerjavi z betoni običajne trdnosti, nižji vodo cementni količnik, kar omogoča višjo končno trdnost betona. Med procesom hidratacije cementa začne zaradi nizkega vodo cementnega količnika primanjkovati proste vode. S črpanjem vode iz finih kapilarnih por se v podajni strukturi strjujoče se cementne paste pojavijo velike sile, zaradi katerih se beton krči in razpoka. Trajnost betonskega elementa se zmanjša. V diplomski nalogi smo preučili vpliv notranjih rezervoarjev vode na krčenje betonov visoke trdnosti. Za notranji rezervoar vode smo uporabili predhodno namočen lahki agregat, frakcije od 0 do 2 mm. V preiskovani betonski mešanici smo 12 % agregata zamenjali s predhodno namočenim lahkim agregatom. Krčenje notranje negovanega betona smo določili eksperimentalno in ga primerjali s krčenjem betona z oznako HSC 1600 iz doktorske disertacije doc. dr. Draga Sajeta. Vzporedno smo merili tlačno trdnost preiskovanega betona. Ugotovili smo, da z uporabo notranjega rezervoarja v obliki z vodo nasičenega lahkega agregata, frakcije od 0 do 2 mm, vplivamo na krčenje betona, izboljša pa se tudi njegova tlačna trdnost.
Abstract (ePrints, secondary language):	High strength concrete has lower water-cement ratio compared to regular concrete, which allows higher strength of the concrete. Because of low water-cement ratio, there is a lack of water during the process of hydration.During the transport of water from the capillary pores of concrete, high forces to the structure of the hardening cement paste were created. Because of this forces, the concrete shrinks, which creates cracks and therefore reduces durability of the concrete elements. In this bachelors thesis we analyzed the impacts of internal water reservoirs on high strength concrete shrinkage. Lightwight aggregate of fractions from 0 to 2 millimeters was pre-soaked and used for internal water reservoir. We used 12% of the pre-soaked lightweight aggregate in our analyzed concrete mix. Shrinkage of our experimental concrete mix was then analyzed and compared to shrinkage of concrete HSC 1600 which was analyzed in Assist. Prof. Drago Saje's PhD thesis. Compressive strength of concrete was also measured in the process. We found out that we can partially reduce concrete shrinkage process with the use of lightweight aggregate with fractions from 0 to 2 millimeters and also improve its compressive strength.
Keywords (ePrints, secondary language):	high strength concrete;concrete shrinkage;compressive strength;water-cement ratio;internal water reservoirs
ID:	8312914