Effect of Different Mineral Admixtures on Sulfate Attack to Mortars

2009 ◽  
Vol 405-406 ◽  
pp. 278-282 ◽  
Author(s):  
Quan Lin Niu ◽  
Nai Qian Feng
Keyword(s):  
Corrosion Resistance ◽  
Blast Furnace Slag ◽  
Natural Zeolite ◽  
Resistance Coefficient ◽  
Expansion Ratio ◽  
Sulfate Attack ◽  
Mineral Admixtures ◽  
Granulated Blast Furnace Slag ◽  
Mortar Bar ◽  
Furnace Slag

Corrosion resistance coefficient of mortars incorporating different mineral admixtures were tested according to GB2420, and the expansion ratio of mortar bar immersed in 5% Na2SO4 solution was measured according to ASTM C1012. It is shown that all the mineral admixtures, including ground granulated blast furnace slag (SL) fly ash (FA), natural zeolite (NZ) and metakaolin (MK) were effective in decreasing the 15-week expansion and increasing the corrosion resistance coefficient of the specimens immersed in Na2SO4 solution as well.

scholarly journals Effect of Mineral Admixtures on the Performance of Low-Quality Recycled Aggregate Concrete

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 596
Author(s):  
Yasuhiro Dosho
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Mineral Admixtures ◽  
Structural Concrete ◽  
Aggregate Concrete ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

To improve the application of low-quality aggregates in structural concrete, this study investigated the effect of multi-purpose mineral admixtures, such as fly ash and ground granulated blast-furnace slag, on the performance of concrete. Accordingly, the primary performance of low-quality recycled aggregate concrete could be improved by varying the replacement ratio of the recycled aggregate and using appropriate mineral admixtures such as fly ash and ground granulated blast-furnace slag. The results show the potential for the use of low-quality aggregate in structural concrete.

Study on Sulfate Resistance of Concrete with Compound Mineral Admixture

2011 ◽  
Vol 99-100 ◽  
pp. 420-425 ◽  
Author(s):  
Qian Rong Yang ◽  
Xiao Qian Wang ◽  
Hui Ji
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
Steel Slag ◽  
Sulfate Attack ◽  
Mineral Admixture ◽  
Sulfate Resistance ◽  
Chemical Attack ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

The strength, expansion and amount of scaling of concrete with compound mineral admixture (CMA) from steel slag, granulated blast furnace slag and fly ash were studied. The result shows that damage by crystallization press from sulfate attack when concrete was exposed to sulfate environments under wetting–drying alternation is much larger than that from sulfate chemical attack. Adding CMA to concrete could reduce the damage from expansion of concrete caused by sulfate chemical attack, but the resistance of concrete to damage by crystallization press from sulfate attack was remarkably reduced.

scholarly journals KCl Extracted from Chlorine Bypass Dust as Activator for Plain Concrete

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6091
Author(s):  
Hongbeom Choi ◽  
Jinman Kim ◽  
Sunmi Choi ◽  
Sungsu Kim
Keyword(s):  
Compressive Strength ◽  
Blast Furnace Slag ◽  
Plain Concrete ◽  
Mineral Admixtures ◽  
Initial Activity ◽  
Granulated Blast Furnace Slag ◽  
Friedel’S Salt ◽  
Rapid Setting ◽  
Water Curing ◽  
Furnace Slag

This study demonstrated the use of KCl separated from chlorine bypass dust (CBD) as an activator for plain concrete. The separated KCl was mixed with either ground granulated blast-furnace slag (BFS) alone, or a mixture of BFS and cement. The mixed paste of separated KCl and BFS set within 24 h, and exhibited a compressive strength of 22.6 MPa after 28 d. The separated KCl, cement, and BFS mixture exhibited a more rapid setting and a higher initial activity. Further, the compressive strength at 28 d was 57.7 MPa, which was 26.2% higher than that of the mixture without the activator. Water curing of samples with added separated KCl led to the generation of hydrocalumite, or Friedel’s salt. However, this hydrocalumite was decomposed while being cured under autoclave conditions at 180 °C. Overall, KCl was an effective activator for composite materials containing cement, and resulted in superior properties compared to mineral admixtures without an activator.

scholarly journals Performa Beton Dengan Ground Granulated Blast Furnace Slag Terhadap Sulfate Attack

2020 ◽  
Vol 16 (3) ◽  
pp. 185
Author(s):  
Rizki Amalia Tri Cahyani ◽  
Ernawan Setyono ◽  
Yunan Rusdianto
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Cementitious Materials ◽  
Sulfate Attack ◽  
Supplementary Cementitious Materials ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

Serangan sulfat (sulfate attack) termasuk hal yang umum terjadi pada struktur beton, mengingat ion sulfat banyak dijumpai pada tanah, air tanah dan air laut. Peningkatan ketahanan beton melawan sulfat akan berdampak besar pada durabilitas dan umur layan struktur beton. Penambahan supplementary cementitious materials seperti GGBFS (ground granulated blast furnace slag) ke campuran beton telah terbukti memberikan pengaruh positif terhadap durabilitas dan properti mekanis beton. Namun, GGBFS tergolong material yang baru dikembangkan di Indonesia dan potensinya dalam meningkatkan durabilitas beton belum dimanfaatkan secara luas. Berdasarkan hal tersebut, perlu dilakukan investigasi terkait aplikasi GGBFS dan pengaruhnya terhadap durabilitas beton, terutama dalam melawan serangan sulfat. Dalam studi ini, durabilitas beton dengan persentase penggantian GGBFS 30%, 50% dan 70% terhadap total volume binder dievaluasi menggunakan perlakuan siklus basah-kering dalam larutan magnesium sulfat. Tingkat degradasi beton diukur dengan melakukan observasi terhadap perubahan kuat tekan dan massa spesimen akibat serangan sulfat. Hasil penelitian menunjukkan bahwa penggantian GGBFS hingga 50% dari total volume binder dapat meningkatkan ketahanan beton terhadap serangan sulfat, ditunjukkan dengan kehilangan massa dan reduksi kekuatan yang lebih rendah dibandingkan spesimen kontrol dengan 100% semen Portland.

Study on Abilities of Mineral Admixtures and Geopolymer to Restrain ASR

2006 ◽  
Vol 302-303 ◽  
pp. 248-254 ◽  
Author(s):  
Ke Liang Li ◽  
Guo Hong Huang ◽  
Lin Hua Jiang ◽  
Yue Bo Cai ◽  
Jian Chen ◽  
...  
Keyword(s):  
Blast Furnace Slag ◽  
Inorganic Material ◽  
Pore Solution ◽  
Test Method ◽  
Sodium Ion ◽  
Mineral Admixtures ◽  
Alkali Silica Reaction ◽  
Granulated Blast Furnace Slag ◽  
Compound Effect ◽  
Furnace Slag

This paper deals with the effect of mineral admixtures and Geopolymer on preventing excessive expansion due to alkali-silica reaction (ASR). The test method used was ASTM C 441-97. Expansions of mortar-bars were measured at 14, 56, 90 days. The results prove that mineral admixtures can effectively restrain ASR. When three kinds of mineral admixtures, silica fume, fly ash, and ground granulated blast-furnace slag (GGBS), were used together, they bring about a compound effect which is more effective to restrain ASR. Mortar expansion can be reduced 81.9 % by this compound effect. Chemical analysis of the pore solution shows that mineral admixtures reduced concentrations of hydroxyl, potassium and sodium ion, so that damages from ASR decreases. Geopolymer, an amorphous inorganic material, was prepared with metakaolin and other mineral admixtures in the condition of high pH. Alkalis fixed in the framework of Geopolymer, there are no enough alkalis to react with active aggregates. Geopolymer does not generate any dangerous alkali-silica reaction even with alkali contents as high as 12.1 %.

Strength and Sulfuric Acid Resistance of Three Component Geopolymer

2015 ◽  
Vol 1129 ◽  
pp. 607-613
Author(s):  
Hiroki Goda ◽  
Koji Harada ◽  
Shunji Tsugo ◽  
Makoto Hibino
Keyword(s):  
Compressive Strength ◽  
Sulfuric Acid ◽  
Silica Fume ◽  
Blast Furnace Slag ◽  
Acid Resistance ◽  
Mineral Admixtures ◽  
Chemical Attack ◽  
Granulated Blast Furnace Slag ◽  
Sulfate Solutions ◽  
Furnace Slag

The compressive strength and resistance to chemical attack of a fly-ash-based geopolymer, to which ground granulated blast furnace slag (B.F.S) and silica fume were added as mineral admixtures, were evaluated. The B.F.S. constituted 10% of the total powder amount in this geopolymer, which exhibited a high compressive strength. In addition, the compressive strength remained unchanged with proportional additions of silica fume to the mixture. The geopolymer exhibited, however, different resistance to sulfuric acid and sodium sulfate solutions during diffusion testing. In fact, the resistance of the B.F.S-containing mix to sulfuric acid was enhanced by the addition of silica fume and by autoclaving.

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