131. |
132. |
133. Poročilo o preskusu št.: LVG 2023-119 : vzorec št. 2023/00582Tine Hauptman, Špela Hočevar, Barbara Piškur, 2023, izvedensko mnenje, arbitražna odločba Ključne besede: varstvo gozdov, morfološke analize, Lecanosticta acicola, Dothistroma pini, Dothistroma septosporum, bori
Objavljeno v DiRROS: 19.09.2023; Ogledov: 311; Prenosov: 0 |
134. Poročilo o preskusu št.: LVG 2023-117 : vzorec št. 2023/00560Nikica Ogris, Zina Devetak, Špela Hočevar, Barbara Piškur, 2023, izvedensko mnenje, arbitražna odločba Ključne besede: varstvo gozdov, morfološke analize, Lecanosticta acicola, Dothistroma pini, Dothistroma septosporum, bori
Objavljeno v DiRROS: 19.09.2023; Ogledov: 296; Prenosov: 0 |
135. Poročilo o preskusu št.: LVG 2023-116 : vzorec št. 2023/00558Nikica Ogris, Zina Devetak, Špela Hočevar, Barbara Piškur, 2023, izvedensko mnenje, arbitražna odločba Ključne besede: varstvo gozdov, morfološke analize, Fusarium circinatum, borov smolasti rak, Pinus
Objavljeno v DiRROS: 19.09.2023; Ogledov: 326; Prenosov: 0 |
136. Poročilo o preskusu št.: LVG 2023-118 : vzorec št. 2023/00557Nikica Ogris, Špela Hočevar, Zina Devetak, Barbara Piškur, 2023, izvedensko mnenje, arbitražna odločba Ključne besede: varstvo gozdov, morfološke analize, platanov obarvani rak, Ceratocystis platani, platana, Platanus, odmiranje
Objavljeno v DiRROS: 18.09.2023; Ogledov: 202; Prenosov: 0 |
137. Potential of green ceramics waste for alkali activated foamsBarbara Horvat, Vilma Ducman, 2019, izvirni znanstveni članek Povzetek: The aim of the paper is to research the influence of foaming and stabilization agents in the alkali activation process of waste green ceramics for future low cost up-cycling into lightweight porous thermal insulating material. Green waste ceramics, which is used in the present article, is a green body residue (non-successful intermediate-product) in the synthesis of technical ceramics for fuses. This residue was alkali activated with Na-water glass and NaOH in theoretically determined ratio based on data from X-ray fluorescence (XRF) and X-ray powder diffraction (XRD) that was set to maximise mechanical properties and to avoid efflorescence. Prepared mixtures were compared to alkali activated material prepared in theoretically less favourable ratios, and tested on the strength and density. Selected mixtures were further foamed with different foaming agents, that are Na-perborate (s), H2O2 (l), and Al (s), and supported by a stabilization agent, i.e., Na-dodecyl sulphate. The goal of the presented work was to prepare alkali activated foam based on green ceramics with density below 1 kg/l and compressive strength above 1 MPa.
Ključne besede: alkali activation, foaming, SEM, XRF, XRD, mechanical strength
Objavljeno v DiRROS: 14.09.2023; Ogledov: 275; Prenosov: 140
 Celotno besedilo (6,88 MB)
Gradivo ima več datotek! Več... |
138. Poročilo o preskusu št.: LVG 2023-115 : vzorec št. 2023/00556Tine Hauptman, Špela Hočevar, Zina Devetak, Barbara Piškur, 2023, izvedensko mnenje, arbitražna odločba Ključne besede: varstvo gozdov, morfološke analize, Fusarium circinatum, borov smolasti rak, Pinus, bor
Objavljeno v DiRROS: 13.09.2023; Ogledov: 216; Prenosov: 0 |
139. Poročilo o preskusu št.: LVG 2023-114 : vzorec št. 2023/00555Tine Hauptman, Špela Hočevar, Zina Devetak, Barbara Piškur, 2023, izvedensko mnenje, arbitražna odločba Ključne besede: varstvo gozdov, morfološke analize, Fusarium circinatum, borov smolasti rak, Pinus, bor
Objavljeno v DiRROS: 13.09.2023; Ogledov: 226; Prenosov: 0 |
140. The potential of ladle slag and electric arc furnace slag use in synthesizing alkali activated materials; the influence of curing on mechanical propertiesMark Češnovar, Katja Traven, Barbara Horvat, Vilma Ducman, 2019, izvirni znanstveni članek Povzetek: Alkali activation is studied as a potential technology to produce a group of high performance building materials from industrial residues such as metallurgical slag. Namely, slags containing aluminate and silicate form a useful solid material when activated by an alkaline solution. The alkali-activated (AA) slag-based materials are promising alternative products for civil engineering sector and industrial purposes. In the present study the locally available electric arc furnace steel slag (Slag A) and the ladle furnace basic slag (Slag R) from different metallurgical industries in Slovenia were selected for alkali activation because of promising amorphous Al/Si rich content. Different mixtures of selected precursors were prepared in the Slag A/Slag R ratios 1/0, 3/1, 1/1, 1/3 and 0/1 and further activated with potassium silicate using an activator to slag ratio of 1:2 in order to select the optimal composition with respect to their mechanical properties. Bending strength of investigated samples ranged between 4 and 18 MPa, whereas compressive strength varied between 30 and 60 MPa. The optimal mixture (Slag A/Slag R = 1/1) was further used to study strength development under the influence of different curing temperatures at room temperature (R. T.), and in a heat-chamber at 50, 70 and 90 °C, and the effects of curing time for 1, 3, 7 and 28 days was furthermore studied. The influence of curing time at room temperature on the mechanical strength at an early age was found to be nearly linear. Further, it was shown that specimens cured at 70 °C for 3 days attained almost identical (bending/compressive) strength to those cured at room temperature for 28 days. Additionally, microstructure evaluation of input materials and samples cured under different conditions was performed by means of XRD, FTIR, SEM and mercury intrusion porosimetry (MIP).
Ključne besede: alkali activation, slag, influence of curing regime, FTIR
Objavljeno v DiRROS: 13.09.2023; Ogledov: 263; Prenosov: 147
Celotno besedilo (10,76 MB)
Gradivo ima več datotek! Več... |
