SULFURIC ACID RESISTANCE OF HARDENED CALCIUM ALUMINATE CEMENT CONTAINING BLAST FURNACE SLAG

During the thermal recovery of heavy oil thermal recovery wells, improving the mechanical properties and integrity of the cement ring is of great significance for the safe and efficient exploitation of heavy oil resources. This paper studies the relative properties of calcium aluminate cement and three kinds of slags under the conditions of 50°C × 1.01 MPa and 315°C × 20.7 MPa. CAC-slag composite material performance was evaluated using the cement paste compressive strength and permeability tests to study the physical properties of CAC with blast furnace slag. X-ray diffraction analysis, scanning electron microscopy (SEM), and thermal analysis (DSC/TG) were carried out to investigate the mineralogical composition of CAC with blast furnace slag. Results show that adding blast furnace slag did not affect the performance of cement slurry. Moreover, C2ASH8 curing occurred at low temperature, the microstructure of CAC paste was compact, and the permeability resistance was improved, thus improving the low-temperature properties of neat CAC. When cured at a high temperature, the CAC paste was mainly hydrated with C3ASH4 and AlO(OH), which had a well-developed crystal structure. Adding blast furnace slag can improve the CAC resistance to high temperature.

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Sulfuric Acid Resistance of Concrete with Blast Furnace Slag Fine Aggregate

Journal of Civil Engineering and Architecture ◽

10.17265/1934-7359/2014.11.007 ◽

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

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Durability of Fibre-Reinforced Calcium Aluminate Cement (CAC)–Ground Granulated Blast Furnace Slag (GGBFS) Blended Mortar after Sulfuric Acid Attack

Materials ◽

10.3390/ma13173822 ◽

2020 ◽

Vol 13 (17) ◽

pp. 3822

Author(s):

Wei Fan ◽

Yan Zhuge ◽

Xing Ma ◽

Christopher W. K. Chow ◽

Nima Gorjian ◽

...

Keyword(s):

Sulfuric Acid ◽

Calcium Aluminate ◽

Calcium Aluminate Cement ◽

Acid Attack ◽

Granulated Blast Furnace Slag ◽

Deterioration Mechanism ◽

Direct Tensile ◽

Direct Tensile Strength ◽

Aluminate Cement ◽

Furnace Slag

Concrete wastewater infrastructures are important to modern society but are susceptible to sulfuric acid attack when exposed to an aggressive environment. Fibre-reinforced mortar has been adopted as a promising coating and lining material for degraded reinforced concrete structures due to its unique crack control and excellent anti-corrosion ability. This paper aims to evaluate the performance of polyethylene (PE) fibre-reinforced calcium aluminate cement (CAC)–ground granulated blast furnace slag (GGBFS) blended strain-hardening mortar after sulfuric acid immersion, which represented the aggressive sewer environment. Specimens were exposed to 3% sulfuric acid solution for up to 112 days. Visual, physical and mechanical performance such as water absorption ability, sorptivity, compressive and direct tensile strength were evaluated before and after sulfuric acid attack. In addition, micro-structure changes to the samples after sulfuric acid attack were also assessed by X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) to further understand the deterioration mechanism. The results show that overall fibre-reinforced calcium aluminate cement (CAC)-based samples performed significantly better than fibre-reinforced ordinary Portland cement (OPC)-based samples as well as mortar samples in sulfuric acid solution in regard to visual observations, penetration depth, direct tensile strength and compressive reduction. Gypsum generation in the cementitious matrix of both CAC and OPC-based systems was the main reason behind the deterioration mechanism after acid attack exposure. Moreover, laboratory sulfuric acid testing has been proven for successfully screening the cementitious material against an acidic environment. This method can be considered to design the service life of concrete wastewater pipes.

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Effect of Fine Sand of Blast-Furnace Slag on Freeze and Thaw Resistance, Sulfate Resistance and Sulfuric Acid Resistance of Mortar

Journal of MMIJ ◽

10.2473/journalofmmij.133.151 ◽

2017 ◽

Vol 133 (7) ◽

pp. 151-156

Author(s):

Daiki NAKAMURA ◽

Hidekazu YAMAMOTO ◽

Yuto TANAKADATE ◽

Shunsuke HANEHARA ◽

Tetsuya OYAMADA

Keyword(s):

Blast Furnace ◽

Sulfuric Acid ◽

Blast Furnace Slag ◽

Acid Resistance ◽

Fine Sand ◽

Sulfate Resistance ◽

Freeze And Thaw ◽

Furnace Slag

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EXPERIMENTAL STUDY ON THE SULFURIC ACID RESISTANCE OF LOW CARBON CONCRETE

Proceedings of International Structural Engineering and Construction ◽

10.14455/isec.2021.8(1).mat-15 ◽

2021 ◽

Vol 8 (1) ◽

Author(s):

Hiyori Ishizuka ◽

Hiromi Fujiwara ◽

Masanori Maruoka ◽

Tao Wang ◽

Shintaro Tanaka

Keyword(s):

Blast Furnace ◽

Sulfuric Acid ◽

Fly Ash ◽

Blast Furnace Slag ◽

Fine Powder ◽

Acid Resistance ◽

Hydration Reaction ◽

Low Carbon ◽

Countermeasures Research ◽

Furnace Slag

In recent years, deterioration of concrete structures of sewerage facilities due to sulfuric acid attacks has been progressing. Therefore, it can be concluded that the demand for sulfur-acid resistant concrete is extremely high. In addition, concerning recent global warming countermeasures, research and development is underway on low-carbon concrete that reduced cement, which emits a large amount of carbon dioxide during the manufacturing process. The purpose of this study is to develop low carbon concrete with high sulfur-acid resistance by replacing cement with large amounts of blast furnace slag and various admixtures. As a result, it was found that the sulfur-acid resistance was improved when using blast furnace slag fine powder and fly-ash. In particular, when cement content was 20% of binder by mass, it was confirmed that the sulfur-acid resistance was excellent. What is more, there was no loss in compressive strength. It was considered that almost Ca(OH) produced by hydration reaction of cement reacted with blast furnace slag and fly-ash, so the reaction of sulfur-acid and calcium hydroxide was suppressed.

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Effect of Fly Ash and Ground Granulated Blast-Furnace Slag on Sulfuric Acid Resistance of Concrete

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.243-249.1860 ◽

2011 ◽

Vol 243-249 ◽

pp. 1860-1865

Author(s):

Bei Xing Li ◽

Kai Yang ◽

Jiang Liu ◽

Ming Kai Zhou

Keyword(s):

Blast Furnace ◽

Sulfuric Acid ◽

Fly Ash ◽

Cement Paste ◽

Blast Furnace Slag ◽

Acid Resistance ◽

Basic Reason ◽

Granulated Blast Furnace Slag ◽

Furnace Slag

The effect of Fly ash (FA) and ground granulated blast-furnace slag (GGBS) on sulfuric acid resistance of concrete has been investigated in this study. Cement was replaced by FA with the incorporation amount from 20% to 50% or by GGBS from 35% to 65%. Results indicate that with an increase in fly ash replacement amount, the sulfuric acid resistance of concrete was improved. Sulfuric acid resistance of concrete with GGBS was improved only when the replacement amount of GGBS exceeds 50%. The basic reason for deterioration of concrete in sulfuric acid is the degradation of C-S-H gel in matrix. Increasing the content of SiO2 in cement paste can improve the acid resistance of concrete.

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Modeling the Effect of Alternative Cementitious Binders in Ultra-High-Performance Concrete

Materials ◽

10.3390/ma14237333 ◽

2021 ◽

Vol 14 (23) ◽

pp. 7333

Author(s):

Solmoi Park ◽

Namkon Lee ◽

Gi-Hong An ◽

Kyeong-Taek Koh ◽

Gum-Sung Ryu

Keyword(s):

Calcium Aluminate ◽

Blast Furnace Slag ◽

High Performance ◽

High Performance Concrete ◽

Calcium Aluminate Cement ◽

Ultra High Performance Concrete ◽

Calcium Sulfoaluminate Cement ◽

Calcium Sulfoaluminate ◽

Aluminate Cement ◽

Furnace Slag

The use of alternative cementitious binders is necessary for producing sustainable concrete. Herein, we study the effect of using alternative cementitious binders in ultra-high-performance concrete (UPHC) by calculating the phase assemblages of UHPC in which Portland cement is replaced with calcium aluminate cement, calcium sulfoaluminate cement, metakaolin or blast furnace slag. The calculation result shows that replacing Portland cement with calcium aluminate cement or calcium sulfoaluminate cement reduces the volume of C-S-H but increases the overall solid volume due to the formation of other phases, such as strätlingite or ettringite. The modeling result predicts that using calcium aluminate cement or calcium sulfoaluminate cement may require more water than it would for plain UHPC, while a similar or lower amount of water is needed for chemical reactions when using blast furnace slag or metakaolin.

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