Mešane ruševine v betonu

diplomska naloga

Maja Jelen (Author), Violeta Bokan-Bosiljkov (Mentor), Dušan Žagar (Thesis defence commission member), Zvonko Cotič (Co-mentor)

Abstract

Zaradi zahteve po varovanju naravnih virov so zahteve po uporabi recikliranih materialov vse bolj pogoste tudi v gradbeni praksi, še posebej, ker je gradbeništvo velik porabnik naravnih virov. Uporaba recikliranih agregatov za cementne betone pomeni manjšo porabo naravnih agregatov. Po drugi strani pa morajo cementni betoni z vključenim recikliranim agregatom izpolnjevati enake zahteve glede trdnosti, obstojnosti in drugih lastnosti, kot običajni betoni, saj obstaja v nasprotnem primeru možnost zmanjšanja varnosti betonskih objektov. V okviru svoje diplomske naloge sem ugotavljala vpliv drobljenih mešanih gradbenih ruševin na lastnosti betona v svežem in strjenem stanju. Drobljene mešane ruševine sem na terenu presejala čez sito 30 x 30. V laboratoriju sem nato najprej določila lastnosti recikliranega agregata. V nadaljevanju sem zasnovala tri sestave betona z recikliranim agregatom. V prvem betonu sem zamenjala 30 % grobe frakcije z grobim recikliranim agregatom, v drugem betonu sem z grobo reciklirano frakcijo zamenjala grobo agregat v celoti, v tretjem betonu pa sem uporabila samo recikliran agregat. Vsi betoni so imeli enako količino cementa, enak delež superplastifikatorja in enako vodo-cementno razmerje. Na koncu sem betona zamešala, določila lastnosti v svežem stanju, jih vgradila v kalupe in na strjenem betonu določila gostoto, tlačno, upogibno in cepilno trdnost ter odpornost proti prodoru vode pod pritiskom. Na podlagi dobljenih rezultatov preiskav sem betone uvrstila v ustrezne razrede tlačne trdnosti ter predlagala možne načine uporabe betonov z različnimi deleži vključenih recikliranih ruševin.

Keywords

gradbeništvo;diplomska naloga;UNI;B-VOI;recikliran agregat;gradbeni odpadki;mešane ruševine;nadomeščanje naravnega agregata z recikliranim;

Data

Language:	Slovenian
Year of publishing:	2014
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FGG - Faculty of Civil and Geodetic Engineering
Publisher:	M. Jelen
UDC:	628.4.036:691.3(497.4)(043.2)
COBISS:	6783841
Views:	2929
Downloads:	447
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Use of demolished building waste in concrete composites
Secondary abstract:	Due to the requirement to protect natural resources, the demand for the use of recycled materials is increasingly common in construction practice, especially since the construction sector is a major consumer of natural resources. The use of recycled aggregates for concretes with cement binder means less consumption of natural aggregates. On the other hand, concrete with recycled aggregates has to meet the same requirements for strength, durability and other characteristics than conventional concrete, since there is otherwise the possibility of reducing the safety of concrete structures. In the course of this thesis, I identify the impact of crushed mixed construction demolition waste on concrete properties in fresh and hardened state. The waste was sieved through a sieve of 30 x 30 and thus recycled aggregate was obtained. In the laboratory, I first established properties of the recycled aggregate and designed three concrete compositions with recycled aggregates. In the first concrete I replaced 30% of the coarse aggregate fraction with coarse recycled aggregates. In the second concrete I replaced whole coarse aggregate with the recycled coarse aggregate. In the third concrete, I used only recycled aggregate. All concretes had the same amount of cement, the same proportion of superplasticizer and the same water-cement ratio. In the end I mixed the three concretes, tested the properties in the fresh state and cast the concretes into moulds. In hardened state I determined the density, compressive, flexural and splitting strengths and resistance to penetration of water under pressure. Based on the obtained results I placed concrete mixtures in the appropriate compressive strength classes and suggested possible applications of concrete mixtures with different contents of recycled aggregate.
Secondary keywords:	recycled aggregate;construction waste;mixed demolition waste;replacement of natural aggregate by recycled one;
File type:	application/pdf
Type (COBISS):	Bachelor thesis/paper
Thesis comment:	Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Pages:	XIV, 64 str.
ID:	8708354