scholarly journals Fatigue Life in Water Condition of Concrete with Blast Furnace Slag Sand Subjected to Freeze-Thaw Attack

2017 ◽  
Vol 66 (8) ◽  
pp. 588-593
Author(s):  
Toshiki AYANO ◽  
Takashi FUJII
Keyword(s):  
Blast Furnace ◽  
Fatigue Life ◽  
Blast Furnace Slag ◽  
Freeze Thaw ◽  
Water Condition ◽  
Furnace Slag

scholarly journals Freeze–Thaw Effect on Road Concrete Containing Blast Furnace Slag: NMR Relaxometry Investigations

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3288
Author(s):  
Liliana Maria Nicula ◽  
Ofelia Corbu ◽  
Ioan Ardelean ◽  
Andrei Victor Sandu ◽  
Mihai Iliescu ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Nmr Relaxation ◽  
Invasive Technique ◽  
Freeze Thaw ◽  
Nmr Relaxometry ◽  
Main Technique ◽  
Relaxation Measurements ◽  
Furnace Slag ◽  
Standard Techniques

The present work investigates the effect of freeze–thaw cycles on the porosity of three mixtures of road concrete containing blast furnace slag in comparison with two mixtures made with conventional materials. The main technique used in our investigations is nuclear magnetic resonance (NMR) relaxometry. This permitted the extraction of information with respect to the freeze–thaw effect on pore-size distribution, which influences both the mechanical strength and the molecular transport through the material. Moreover, by using this technique, the structure of the air voids was analyzed for the entire pore system in the cement paste and the aggregate particles. The samples under study were first dried in a vacuum oven and then saturated with water or cyclohexane where the distribution of the transverse relaxation times of the protons was recorded. The NMR relaxation measurements were performed on samples extracted from specimens maintained at 300 freeze–thaw cycles and on control samples extracted from specimens kept in water during the freeze–thaw period. Scanning Electron Microscopy (SEM) was used to analyze the microstructure of concrete samples in order to obtain information about the pore sizes and the distance between them. The results from the NMR relaxation measurements were consistent with those obtained by using standard techniques for determining the porosity and the freeze–thaw resistances. The investigations made it possible to establish the optimal composition of blast furnace slag that can be incorporated into road concrete compositions. This non-invasive technique can also complete standard techniques for assessing the porosity and the progress of internal cracks during the freeze–thaw test.

scholarly journals FREEZE-THAW RESISTANCE OF BLAST FURNACE SLAG GEOPOLYMER MORTARS

2020 ◽  
Author(s):  
Şinasi BİNGÖL ◽  
Cahit BİLİM ◽  
Cengiz ATİŞ ◽  
Uğur DURAK
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Freeze Thaw ◽  
Furnace Slag

scholarly journals Determining k-Value with Regard to Freeze-Thaw Resistance of Concretes Containing GGBS

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2349
Author(s):  
Jerzy Wawrzeńczyk ◽  
Agnieszka Molendowska ◽  
Tomasz Juszczak
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Trial And Error ◽  
K Value ◽  
Freeze Thaw ◽  
Resistance Analysis ◽  
Granulated Blast Furnace Slag ◽  
Concrete Mix ◽  
Furnace Slag ◽  
Slag Content

The European concrete standard EN 206 introduces the k-value concept as one of the three methods allowing the use of granulated blast furnace slag in the design of the freeze-thaw-resistant concrete mix. It is assumed that the freeze-thaw durability of the concrete, whose composition (w/c ratio) has been corrected by adopting a certain k-value, is the same as the freeze-thaw resistance of the reference concrete made with the cement containing no addition (CEM I). This article presents the results of freeze-thaw resistance analysis (modified with the ASTM C666A standard Class XF3) of 24 series of concretes made with a binder containing varied amounts of slag, with a w/b ratio ranging from 0.25 to 0.55. The aim of the study was to estimate the k-value as a parameter defined by the w/b ratio and the slag content in the binder. In this approach, the k-value is determined by trial and error in such a way that the deformation of the concrete specimens containing the slag corresponds to the deformation of the reference concrete. As shown by the analysis, the k-value decreases with increasing slag content in the binder.

scholarly journals Freeze-Thaw Resistance of Cement Screed with Various Supplementary Cementitious Materials

2019 ◽  
Vol 58 (1) ◽  
pp. 66-74 ◽  
Author(s):  
Pavel Reiterman ◽  
Ondřej Holčapek ◽  
Ondřej Zobal ◽  
Martin Keppert
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Frost Resistance ◽  
Blast Furnace Slag ◽  
Ceramic Powder ◽  
Supplementary Cementitious Materials ◽  
Partial Replacement ◽  
Freeze Thaw ◽  
Mineral Additives ◽  
Furnace Slag

Abstract This paper describes a study of the effect of partial replacement of ordinary Portland cement (OPC) by various mineral additives in the screed mixtures. Ceramic powder, blast furnace slag and fly ash were gradually employed in increments of 12.5 wt.% up to 50 wt.% to replace OPC. The mixtures were designed to a constant consistency. The influence of mineral additives was evaluated in terms of the air content in the fresh mixtures, the compressive strength, the flexural strength and the freeze-thaw resistance and using non-destructive measurements after 28 and 90 days. The accompanied paste sampleswere analysed using thermogravimetry to monitor the hydration process by means of total bound water content. The decrease in the mechanical properties and the frost resistance of the mixtures with the mineral additives were recorded, because of the necessity for a larger addition of water. According to the valid standards for concrete screed related to the frost resistance, it could be concluded that maximal suitable cement replacement contents are 12.5, 37.5 and 50 wt.% for ceramic powder, fly ash and blast furnace slag, respectively. The freeze-thaw resistance of the studied materials was found to be strongly related to the content of CSH and CAH hydrates.

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