Metode za določevanje krčenja cementnih sistemov : diplomska naloga

Faletič, Andrej (avtor), Bokan-Bosiljkov, Violeta (mentor), Jereb, Vesna (komentor)

Krčenje cementnih sistemov je pojav zmanjšanja prostornine, brez vpliva zunanjih sil. Lahko ima velik vpliv na trajnost gradbenih konstrukcij, zato je nujno merjenje krčenja in na podlagi teh meritev razviti manj krčljive materiale. Zaradi različnih sestav teh materialov in različnih vrst krčenja obstaja veliko metod za merjenje krčenja, ki so lahko standardizirane ali pa razvojne. Rezultati teh metod se večkrat med seboj razlikujejo in so si včasih celo nasprotujoči. V prvem delu naloge je poudarek na pregledu metod za določevanje krčenja. Zajema njihov opis in medsebojno primerjavo. Za boljše razumevanje procesa krčenja je podano tudi teoretično ozadje o vrstah krčenja in vplivu materialov na krčenje. V drugem delu je predstavljen eksperimentalni del naloge. Preiskave so bile opravljene v podjetju TKK d.o.o. iz Srpenice, kjer smo z metodo krčenja v stožcu merili zgodnje krčenje (do 24 ur), z metodo po standardu SIST EN 12617-4:2002 pa smo merili krčenje v obdobju od 24 ur do 28 dni. Preiskave so potekale na različnih sestavah podlivnih malt. Na podlagi rezultatov eksperimentalnega dela smo uporabljeni metodi ovrednotili. Ocenili smo tudi optimalno časovno okno za začetek merjenja krčenja.

• Jezik: Slovenski jezik
• Ključne besede: gradbeništvo, diplomska dela, krčenje, metode, merjenje, deformacije, nabrekanje, nega, čas nič
• Vrsta gradiva: Diplomsko delo
• Tipologija: 2.11 - Diplomsko delo
• Organizacija: FGG - Fakulteta za gradbeništvo in geodezijo
• Kraj izida: Ljubljana
• Založnik: [A. Faletič]
• Leto izida: 2016
• Št. strani: X, 61 str.
• PID: 20.500.12556/RUL-86423
• UDK: 691.54(043.2)
• COBISS.SI-ID: 7744609
• Datum objave v RUL: 14.11.2016

Sekundarni jezik

• Jezik: Angleški jezik
• Naslov: Methods for determining the shrinkage of cementitious systems

Izvleček

Shrinkage of cementitious system is manifested in the reduction of the system’s volume, without the influence of external forces. It can have a major impact on the durability of buildings and civil engineering structures. Therefore, it is essential to measure shrinkage and on the basis of these measurements to develop less-shrinkable materials. However, due to the different compositions of these materials and different shrinkage types, there are many methods for measuring shrinkage, which may be standardized or in development. The results of these methods often differ and are sometimes even contradictory. The first part of the thesis focuses on the review of test methods for the determination of shrinkage. It includes their description and mutual comparison. To better understand the process of shrinkage the thesis includes also theoretical background on the shrinkage types and the influence of constituent materials on shrinkage. The second part of the thesis presents the results of experimental work, which was carried out in the company TKK d.o.o. from Srpenica. In this part we measured early shrinkage (up to 24 hours) with non-standardised method “Shrinkage cone” and long term shrinkage (from 24 hours up to 28 days) with the method in accordance with standard EN 12617-4: 2002. The tests were carried out on different compositions of grouts. Based on the results of experimental work we evaluated the two methods. We also estimated the optimal time window to start the measurement of shrinkage.

• Ključne besede: graduation thesis, civil engineering, shrinkage, methods, measuring, strains, swelling, curing, time zero