scholarly journals Influence of Blast Furnace Slag Sand on Resistance to Sulfuric Acid Attack of Mortar

2018 ◽  
Vol 67 (4) ◽  
pp. 468-473
Author(s):  
Hiroshi YAMADA ◽  
Makoto ICHITSUBO
Keyword(s):  
Blast Furnace ◽  
Sulfuric Acid ◽  
Blast Furnace Slag ◽  
Acid Attack ◽  
Furnace Slag

scholarly journals The Resistance to Sulfuric Acid Attack in Cementitious Materials with Iron-blast-furnace Slag

2006 ◽  
Vol 44 (3) ◽  
pp. 19-25 ◽  
Author(s):  
M. Ichitsubo ◽  
T. Yamaguchi ◽  
I. Horiguchi ◽  
K. Takemura
Keyword(s):  
Blast Furnace ◽  
Sulfuric Acid ◽  
Blast Furnace Slag ◽  
Cementitious Materials ◽  
Acid Attack ◽  
Iron Blast Furnace ◽  
Furnace Slag

scholarly journals Severe Sulfuric Acid Attack on Self-Compacting Concrete with Granulometrically Optimized Blast-Furnace Slag-Comparison of Different Test Methods

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1431
Author(s):  
Sara Irico ◽  
Laurence De Meyst ◽  
Dirk Qvaeschning ◽  
Maria Cruz Alonso ◽  
Kristina Villar ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Sulfuric Acid ◽  
Mass Loss ◽  
Blast Furnace Slag ◽  
Moderate Increase ◽  
Acid Attack ◽  
Slag Cement ◽  
Self Compacting Concrete ◽  
Acid Media ◽  
Furnace Slag

The corrosion by severe sulfuric acid attack at pH 2 of two self-compacting concrete (SCC) types that are based on ordinary Portland cement (OPC) and granulometrically optimized blast-furnace slag cement was evaluated by three complementary tests that were performed in different research institutes. The use of SCC is a smart and promising solution to improve the performance of concrete in an aggressive environment, especially regarding ready-mixed concrete applications, since good compaction is less dependent on workmanship. The relevance and practical advantages of the different test protocols and the influence of the experimental parameters are discussed. It appears that the frequency of renewing the acid solution during the exposure period is the main parameter that influences the mass loss and the rate of degradation, while the sample geometry and the ratio between the volume of solution and concrete surface area had no clear influence. Nevertheless, there was reasonable agreement between the methods regarding the magnitude of the concrete degradation (resulting in a mass loss of about 2.5 kg/m² in six months time). The use of granulometrically optimized slag cement provided a moderate increase of the concrete resistance against acid attack, and this practice might be recommended in order to increase the durability of structures exposed to sulfuric acid media. The fact that the difference in comparison with SCC-OPC was rather limited shows that the influence of the cement type becomes less relevant in the case of concrete with low w/c ratio and optimized concrete technology.

scholarly journals Sulfuric Acid Resistance of Concrete with Blast Furnace Slag Fine Aggregate

2014 ◽  
Vol 8 (11) ◽  
Author(s):  
Paweena Jariyathitipong ◽  
Kazuyoshi Hosotani ◽  
Takashi Fujii ◽  
Toshiki Ayano
Keyword(s):  
Blast Furnace ◽  
Sulfuric Acid ◽  
Blast Furnace Slag ◽  
Acid Resistance ◽  
Fine Aggregate ◽  
Furnace Slag

Durability of Blended PFA and POFA Geopolymer Concrete

2015 ◽  
Vol 754-755 ◽  
pp. 359-363
Author(s):  
M. Azreen ◽  
M.W. Hussin
Keyword(s):  
Blast Furnace ◽  
Sulfuric Acid ◽  
Structural Analysis ◽  
Blast Furnace Slag ◽  
Cement Industry ◽  
Supplementary Cementitious Materials ◽  
Palm Oil Fuel Ash ◽  
Sulfate Solutions ◽  
Fuel Ash ◽  
Furnace Slag

Ordinary Portland Cement (OPC) concrete is one of the most widely used construction materials globally, though its production in construction has negative environmental impact. About 0.9 ton of CO2is emitted for every one (1) ton of cement produced. In order to reduce the amount of CO2emission from cement industry, the utilization of supplementary cementitious materials such as pulverized fuel ash (PFA), blast-furnace slag and natural pozzolans is common and effective. Geopolymer is an inorganic binder material and can be produced by a geopolymeric reaction of alkali activating solution with silica and alumina rich source materials such as PFA and blast-furnace slag. In this study, the durability of concrete such as the resistance to sulfuric acid and sulfate solutions due to the effect of blended as of PFA and palm oil fuel ash (POFA), along with alkaline activators were investigated. Consequently, the optimum mix design of the blended ash geopolymer (BAG) concrete and OPC concrete specimens were prepared with water to cement ratio of 0.5 by mass as control. The micro structural analysis by X-ray diffraction (XRD) was done. BAG concrete showed better performance in 2% sulfuric acid and 5% sulfate solutions. From micro structural analysis, it was evident that BAG binder gel (N-A-SH) produced more durable material compared with C-S-H binder gel of OPC. The BAG concrete is strongly recommended to be used as an alternative to OPC concrete in addition to its environmental friendliness. Abundant PFA and POFA can be efficiently utilized to produce a high performance concrete.

scholarly journals Optimizing the Acid Resistance of Concrete with Granulated Blast-Furnace Slag

2018 ◽  
Vol 199 ◽  
pp. 02001
Author(s):  
Rolf Breitenbücher ◽  
Jan Bäcker ◽  
Sebastian Kunz ◽  
Andreas Ehrenberg ◽  
Christian Gerten
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Acid Resistance ◽  
Industrial Applications ◽  
Acid Attack ◽  
Dense Microstructure ◽  
Granulated Blast Furnace Slag ◽  
Acid Type ◽  
The Matrix ◽  
Furnace Slag

Concrete for agricultural or industrial applications is often subject to intense acid attack. Most affected structures are sewage structures and biogas plants, natural draught cooling towers or silage silos. Widely independent from acid type, in most cases the acid attack on concrete runs the same way, starting with dissolution of easily soluble calcareous phases like calcium hydroxide. With ongoing attack, calcium-silicate-hydrate crystals (CSH) are also affected by acidic media. In contrast, siliceous phases like silicon-dioxide (SiO2) are widely unaffected by acid attack. While the dissolution of the matrix is increasing with ongoing attack, quarzitic aggregates remain unchanged. Beside the use of coarse SiO2-aggregates, the resistance against acid attack is mainly increased by a minimization of the porosity. For this purpose on one hand, a low water/cement-ratio has to be sought, on the other hand also the fines should be distributed with an optimized grading curve (e.g. Fuller-principle). In practice, this results in a combination of various fine and ultra-fine components, e.g. fly ash, GGBS, silica fume or metakaolin. Such binder compositions lead to a particularly dense microstructure, especially at pore sizes below 1 micron, and a higher chemical resistance due to a lower Ca(OH)2 content. This paper gives an overview on typical acid-resistant concretes, most common applications as well as the effects of the related acid attack and points out the potential of granulated blast furnace slag addition to such concretes.

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