Durability of High-Volume GGBS Concrete

2011 ◽  
Vol 261-263 ◽  
pp. 338-343
Author(s):  
Ke Liang Li ◽  
Guo Hong Huang ◽  
Jun Lin ◽  
Xiu Sheng Tang
Keyword(s):  
Chloride Ion ◽  
High Volume ◽  
Sulfate Solution ◽  
Lifetime Prediction ◽  
Granulated Blast Furnace Slag ◽  
Chloride Ion Penetration ◽  
Steel Bar ◽  
Carbonation Resistance ◽  
Lower Diffusion ◽  
Furnace Slag

To improve structure durability of Cao’e River Floodgate in China, durability and lifetime prediction of high-volume ground granulated blast-furnace slag (GGBS) concrete were investigated. Chloride ion permeability was analyzed with nature soaking method and RCM method. High-volume GGBS concrete had better capability to resist chloride ion penetration with lower diffusion coefficient of chloride ion than ordinary Portland concrete (OPC) had. Experiment of steel-bar corrosion in dry-wet environments proved that high-volume GGBS concrete had better performance to protect steel-bar than OPC had. In the sulfate solution, high-volume GGBS mortar bars only produced small expansion which was 40% of that of Portland cement mortar bars. The performance of frost resistance of high-volume GGBS concrete was favorable. GGBS debased the capability of carbonation resistance. Lifetime prediction illuminated high-volume GGBS concrete was beneficial to extended project lifespan. The results show that high-volume GGBS concrete can solve the facing durability problem of Cao’e River Floodgate.

Effect of Ground Phosphate Slag on the Resistance to Chloride Ion Penetration of Concrete

2011 ◽  
Vol 194-196 ◽  
pp. 924-929
Author(s):  
Jian Xiong Ye ◽  
Ye Jiang Wang ◽  
Shuang Zhao ◽  
Ming Chao Yang ◽  
Chang Hui Yang
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Pore Structure ◽  
Blast Furnace Slag ◽  
Chloride Ion ◽  
Granulated Blast Furnace Slag ◽  
Chloride Ion Penetration ◽  
Phosphate Slag ◽  
Furnace Slag ◽  
Ion Penetration

The permeability resistance of concrete with ground phosphate slag(GPS) against chloride ion penetration was tested according to ASTM1202 and by nitrogen adsorption method. Test results show that by adding ground phosphate slag to concrete, the chloride diffusion coefficient of concrete decreases, and the permeability resistance of concrete against chloride ion penetration increases with improvement of its pore structure. The pores in concrete are refined and the percentage of the pores with diameter less than 20nm in concrete increases. The improvement of pore structure of the concrete by ground phosphate slag is much better than that by the ground granulated blast furnace slag or fly ash, while the addition is 30 percent. The ability of additive to improve the permeability resistance of concrete against chloride ion penetration is in following order: fly ash > ground phosphate slag > ground granulated blast furnace slag.

scholarly journals Behaviour of Ground Granulated Blast Furnace Slag Concrete in Marine Environment under Chloride Attack

2019 ◽  
Vol 9 (1) ◽  
pp. 1659-1664
Keyword(s):  
Blast Furnace ◽  
Silver Nitrate ◽  
Marine Environment ◽  
Blast Furnace Slag ◽  
Chloride Ion ◽  
Penetration Test ◽  
Granulated Blast Furnace Slag ◽  
Chloride Ion Penetration ◽  
Furnace Slag ◽  
Ion Penetration

In conventional concrete, one of the ingredients Cement is partially replaced by Ground Granulated Blast Furnace Slag and its nature is studied in this project.. In the present paper, a comparison of Chloride ion penetration is been done on Concrete specimens with partial GGBS replacement. Two tests have been performed on the concrete specimens in both normal environment and artificial marine environment. One is the conventional RCPT and the other one is the chloride ion penetration test using silver nitrate. Comparison of both the tests under normal and marine environment is the main aim of this paper. After compiling the data both RCPT and the Chloride ion penetration test goes hand in hand and this proves the compatibility of the new chloride ion penetration test using silver nitrate. This work has the comparison of the concrete specimens in normal and marine environments as well with different levels of GGBS replacement.

The Influence of Size Effect on High-Volume Fly-Ash Concrete’s Carbonation Resistance Performance

2011 ◽  
Vol 368-373 ◽  
pp. 1121-1124
Author(s):  
Li Fang Liu ◽  
Xiao Xia Niu ◽  
Wang Yu ◽  
Xiao Man Liu
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Size Effect ◽  
Blast Furnace Slag ◽  
High Volume ◽  
Carbonation Depth ◽  
Granulated Blast Furnace Slag ◽  
High Volume Fly Ash ◽  
Carbonation Resistance ◽  
Furnace Slag

using fixed concrete slump method,the carbonation resistance of concretes with high-volume fly-ash and ground granulated blast-furnace slag had been studied, and make an approach to size- effect .The results show that the more fly-ash joined in,the more carbonation depth is deeper . The carbonation resistance of concretes with high-volume fly-ash and ggbs is better than only with high-volume fly-ash’s. Size effect on carbonation depth of concretes is also important . Carbonation depth will become deeper as soon as the block size improving .and the early improvement is bigger than the late .The more concretes with high-volume fly-ash and ground granulated blast-furnace slag,the size-effect on carbonation depth of concretes will be more evident.

scholarly journals Importance of Cation Species during Sulfate Resistance Tests for Alkali-Activated FA/GGBFS Blended Mortars

Materials ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 3547
Author(s):  
Youngkeun Cho ◽  
Joo Hyung Kim ◽  
Sanghwa Jung ◽  
Yoonseok Chung ◽  
Yeonung Jeong
Keyword(s):  
Compressive Strength ◽  
Magnesium Sulfate ◽  
Sulfate Solution ◽  
Magnesium Ions ◽  
Sulfate Resistance ◽  
Granulated Blast Furnace Slag ◽  
Significant Difference ◽  
Furnace Slag ◽  
Alkali Activated ◽  
Magnesium Sulfate Solution

In this study, the changes in mass, compressive strength, and length of blended mortars were analyzed to investigate their sulfate resistance according to the ground granulated blast furnace slag (GGBFS) blending ratio and type of sulfate solution applied. All alkali-activated mortars showed an excellent sulfate resistance when immersed in a sodium sulfate (Na2SO4) solution. However, when immersed in a magnesium sulfate (MgSO4) solution, different sulfate resistance results were obtained depending on the presence of GGBFS. The alkali-activated GGBFS blended mortars showed a tendency to increase in mass and length and decrease in compressive strength when immersed in a magnesium sulfate solution, whereas the alkali-activated FA mortars did not show any significant difference depending on the types of sulfate solution applied. The deterioration of alkali-activated GGBFS blended mortars in the immersion of a magnesium sulfate solution was confirmed through the decomposition of C–S–H, which is the reaction product from magnesium ions, and the formation of gypsum (CaSO4·2H2O) and brucite (Mg(OH)2).

Ocean Engineering Concrete Using High-Volume GGBS

2012 ◽  
Vol 238 ◽  
pp. 71-74 ◽  
Author(s):  
Ke Liang Li
Keyword(s):  
Mechanical Property ◽  
Diffusion Coefficient ◽  
Effective Diffusion ◽  
Chloride Ion ◽  
High Volume ◽  
Gas Diffusion ◽  
Good Mechanical Property ◽  
Ocean Engineering ◽  
Volume Stability ◽  
Chloride Ion Penetration

To improve ocean engineering durability, concrete using high-volume ground granulated blast-furnace slag (GGBS) was prepared, its mechanical property and durability were investigated. 4% activator and 61% GGBS were used to replace 65% cement in cementitious material. Activator was used to improve workability, volume stability and early strength of high-volume GGBS concrete. Ocean concrete using high-volume GGBS has good impermeability with small gas diffusion coefficient and relative permeability coefficient. As the good property of resistance to chloride-ion penetration with a low effective diffusion coefficient, it can protect steel-bar from corrosions. Property of frost resistance is also favorable. Expansions caused by alkali-silica reaction and sulfate attack fall down markedly after using high-volume GGBS. It is proved that the high-volume GGBS concrete with good mechanical property and durability is applicable to the constructing of ocean engineering concrete.

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