<p>U disertaciji su prikazani rezultati sopstvenog eksperimentalnog<br />istraživanja sulfatne otpornosti betona sa recikliranim agregatom.<br />Istraživanje je zasnovano na komparativnoj analizi dve grupe betona koje<br />se razlikuju u krupnom agregatu, a u okviru kojih su varirani dve vrste<br />cementa i dva vodocementna faktora. Sulfatna otpornost je proveravana<br />nakon 3 i 6 meseci boravka u 5% Na2SO4 i u 5% MgSO4. Na očvrslom betonu<br />ispitivani su kapilarno upijanje vode, promena dužine uzoraka, čvrstoća<br />pri pritisku i urađene su mikrostrukturne analize: MIP, SEM, BSE/EDS,<br />XRD i FTIR. Istaknuto je da se primenom krupnog agregata od recikliranog<br />betona i veziva odgovarajućeg mineraloškog sastava mogu dobiti<br />konstrukcijski betoni, odnosno betoni sa zadovoljavajućim mehaničkim<br />karakteristikama, ali i sa zadovoljavajućom trajnošću sa aspekta<br />sulfatne korozije.</p> / <p>This paper presents the experimental research results of the sulphate resistance of<br />concrete with recycled aggregate. The research is based on a comparative analysis of<br />two groups of concrete that differ in coarse aggregate types. Within these two concrete<br />groups, two types of cement of the same class and two water/cement ratios have been<br />varied. Sulphate resistance was examined after 3 and 6 months of immersion in 5%<br />Na2SO4 and 5% MgSO4. Capillary water absorption, sample length change and<br />compressive strength were studied in hardened concrete and the following<br />microstructural analyzes were performed: MIP, SEM, BSE/EDS, XRD and FTIR. It has<br />been found that structural concrete with apppropriate mechanical properties as well as<br />with satisfactory durability from the aspect of sulphate corrosion can be obtained by<br />combination of a coarse recycled concrete aggregate and a binder of an appropriate<br />mineralogical composition.</p>

<p>Doktorska disertacija je posvećena primeni teorije polugrupa operatora na re&scaron;avanje dve klase Cauchy-jevih početnih problema. U prvom delu smo<br />ispitivali parabolične stohastičke parcijalne diferencijalne jednačine (SPDJ-ne), odredjene sa dva tipa operatora: linearnim zatvorenim operatorom koji<br />generi&scaron;e <em>C</em>₀&minus;polugrupu i linearnim ograničenim operatorom kombinovanim<br />sa Wick-ovim proizvodom. Svi stohastički procesi su dati Wiener-It&ocirc;-ovom<br />haos ekspanzijom. Dokazali smo postojanje i jedinstvenost re&scaron;enja ove klase<br />SPDJ-na. Posebno, posmatrali smo i stacionarni slučaj kada je izvod po<br />vremenu jednak nuli. U drugom delu smo konstruisali kompleksne stepene<br /><em>C</em>-sektorijalnih operatora na sekvencijalno kompletnim lokalno konveksnim<br />prostorima. Kompleksne stepene operatora smo posmatrali kao integralne<br />generatore uniformno ograničenih analitičkih <em>C</em>-regularizovanih rezolventnih<br />familija, i upotrebili dobijene rezultate na izučavanje nepotpunih Cauchy-jevih problema vi&scaron;3eg ili necelog reda.</p> / <p>The doctoral dissertation is devoted to applications of the theory<br />of semigroups of operators on two classes of Cauchy problems. In the first<br />part, we studied parabolic stochastic partial differential equations (SPDEs),<br />driven by two types of operators: one linear closed operator generating a<br /><em>C</em>₀&minus;semigroup and one linear bounded operator with Wick-type multipli-cation. All stochastic processes are considered in the setting of Wiener-It&ocirc;<br />chaos expansions. We proved existence and uniqueness of solutions for this<br />class of SPDEs. In particular, we also treated the stationary case when the<br />time-derivative is equal to zero. In the second part, we constructed com-plex powers of <em>C</em>&minus;sectorial operators in the setting of sequentially complete<br />locally convex spaces. We considered these complex powers as the integral<br />generators of equicontinuous analytic <em>C</em>&minus;regularized resolvent families, and<br />incorporated the obtained results in the study of incomplete higher or frac-tional order Cauchy problems.</p>

<p>Doktorska disertacija je posvećena raznim klasama uop&scaron;tenih stohastičkih procesa i njihovim primenama na re&scaron;avanje singularnih stohastičkih parcijalnih diferencijalnih jednačina. U osnovi, disertacija se može podeliti na dva dela. Prvi deo disertacije (Glava 2) je posvećen strukturnoj karakterizaciji uop&scaron;tenih stohastičkih procesa u vidu haos ekspanzije i integralne reprezentacije. Drugi deo disertacije (Glava 3) čini primena dobijenih rezultata na re&middot;savanje stohastičkog Dirihleovog problema u kojem se množenje modelira Vikovim proizvodom, a koefcijenti eliptičnog diferencijalnog operatora su Kolomboovi uop&scaron;teni stohastički procesi.</p> / <p>Subject of the dissertation are various classes of generalized<br />stochastic processes and their applications to solving singular stochastic<br />partial di&reg;erential equations. Basically, the dissertation can be divided into<br />two parts. The &macr;rst part (Chapter 2) is devoted to structural characteri-<br />zations of generalized random processes in terms of chaos expansions and<br />integral representations. The second part of the dissertation (Chapter 3)<br />involves applications of the obtained results to solving a stochastic Dirichlet<br />problem, where multiplication is modeled by the Wick product, and the<br />coe&plusmn;cients of the elliptic di&reg;erential operator are Colombeau generalized<br />random processes.</p>