scholarly journals EFFECT OF SPECIFIC SURFACE AREA OF GROUND GRANULATED BLAST FURNACE SLAG AND ITS SUBSTITUTION RATE ON STRENGTH DEVELOPMENT OF CONCRETE

2017 ◽  
Vol 82 (740) ◽  
pp. 1517-1526
Author(s):  
Yusuke MIYAZAWA ◽  
Hisashi SUGIYAMA ◽  
Takashi YOKOMURO
Keyword(s):  
Blast Furnace ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Substitution Rate ◽  
Blast Furnace Slag ◽  
Strength Development ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

Analysis on Production Plan and Results of Ground Granulated Blast Furnace Slag Based on Circle Flow Mill

2014 ◽  
Vol 687-691 ◽  
pp. 4187-4191
Author(s):  
Guang Hui Cheng ◽  
Yuan Song
Keyword(s):  
Particle Size ◽  
Blast Furnace ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Blast Furnace Slag ◽  
Activity Index ◽  
Powder Particle Size ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

The change of the specific surface area, particle size and activity index of ground granulated blast furnace slag under different grinding conditions is researched based on closed-circuit mill in the paper. The research shows that the grinding effect is greatly different with the different grinding body, and proper pre-grinding time can help to improve the grinding effect. The optimum plan in this paper is as follow: pre-grinding 15 min at steel bar then grinding 30 min at ball grinding, and it will getting the maximum specific surface area, the smallest powder particle size and the the maximum activity index.

scholarly journals The Effect of Fineness on the Hydration Activity Index of Ground Granulated Blast Furnace Slag

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2984 ◽  
Author(s):  
Jinpeng Dai ◽  
Qicai Wang ◽  
Chao Xie ◽  
Yanjin Xue ◽  
Yun Duan ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Blast Furnace Slag ◽  
Particle Distribution ◽  
Activity Index ◽  
Surface Areas ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

To improve the properties of ground granulated blast furnace slag (GGBS) and utilize ground granulated blast furnace slag efficiently, this study investigates the effect of fineness on the hydration activity index (HAI) of ground granulated blast furnace slag. The hydration activity index of GGBS with six specific surface areas (SSAs) was characterized by the ratio of compressive strength of the prismatic mortar test block. The particle size distribution of GGBS with different grinding times was tested by laser particle size analyzer. The paste of different specific surface area GGBSs in different curing ages was investigated at the micro level by X-ray diffraction, scanning electron microscope, energy dispersive spectrometer, thermogravimetric scanning calorimeter, and differential scanning calorimeter. The effect of particle distribution of GGBS on the hydration activity index of different curing ages was studied by gray correlation analysis. The results indicated that the compressive strength and hydration activity index increases with the increase of a specific surface area of GGBS at different curing ages. The hydration activity index at different curing ages is almost a linear role for specific surface areas. With the increase in the specific surface area of GGBS, the content of Ca(OH)2 in paste decreases gradually. When GGBS was added into a mortar test block, the hydrate calcium silicate gel in paste changed from a high Ca/Si ratio to a low Ca/Si ratio. The 0–10 micron particles of GGBS particle distribution were highly correlated with the hydration activity index at different curing ages.

The Effect of Grinding Aids on Grinding Portland Cement with High Proportions of Slag

2012 ◽  
Vol 174-177 ◽  
pp. 191-197
Author(s):  
Su Zhen Sun ◽  
Yan Mei Yu
Keyword(s):  
Blast Furnace ◽  
Portland Cement ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Blast Furnace Slag ◽  
Blended Cement ◽  
Granulated Blast Furnace Slag ◽  
Grinding Aids ◽  
Furnace Slag

The paper brings information on grinding cement with high proportions of slag in the presence of amine alcohols grinding aids. Grind respectively blended cement with 20%, 50%, and 80% granulated blast furnace slag and analyse the evolution of the specific surface area at various grinding times and grindability. Results show that the specific surface area of belended cement depends on the content of slag and the type and ratio of grinding aid, and grindalility of the cement is also affected by grinding aids.

A Study of Alternative Construction Materials for Slag Derived from Steel Making Industry

2007 ◽  
Vol 544-545 ◽  
pp. 503-506 ◽  
Author(s):  
Kyung Hoon Lee ◽  
Kwang Suk You ◽  
Ji Whan Ahn ◽  
Bong Chan Ban
Keyword(s):  
Compressive Strength ◽  
Blast Furnace ◽  
Portland Cement ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Blast Furnace Slag ◽  
Ordinary Portland Cement ◽  
Alkaline Activator ◽  
Furnace Slag

The present study examined the effect of the activation properties of granulated blast furnace slag according to the type of alkaline activator, the specific surface area of blast furnace slag, and the amount of ordinary Portland cement substituted on the compressive strength of the cement containing blast furnace slag. For activators, Na2SiO3, Na2CO3, NaOH, and Na2SO4 were used. Na2SiO3, Na2CO3, and Na2SO4 were converted into Na2O, to which 1 wt.%, 3 wt.%, 5 wt.%, and 7 wt.% were added, and subjected to experimentation, with the W/S (water/solid) ratio = 0.5. The principal hydration products were C-S-H, C4AH13, Aft (ettringite), and Al(OH)3. Na2CO3 exhibited the largest slag hydration rate. Consequently, the present study used Na2CO3 as the alkaline activator. The compressive strength of blast furnace slag cement mortar was then measured according to the amount of Na2CO3 added (2.5 wt.% and 5.0 wt.%), the specific surface area of blast furnace slag (4,000 cm2/g, 6,000 cm2/g, and 8,000 cm2/g), and the substitution rate (30 wt.%, 50 wt.%, and 70 wt.%) of the blast furnace slag in terms of ordinary Portland cement. The results are as follows: at the ages of 1 day and 3 days, respectively, the early strength increased as the specific surface area of blast furnace slag and the amount of alkaline activator added increased; at the age of 7 or more days, the compressive strength increased as the amount of alkaline activator added decreased and as the specific surface area of blast furnace slag increased.

scholarly journals Control of the setting reaction and strength development of slag-blended volcanic ash-based phosphate geopolymer with the addition of boric acid

2021 ◽  
Author(s):  
Jean Noël Yankwa Djobo ◽  
Dietmar Stephan
Keyword(s):  
Blast Furnace ◽  
Boric Acid ◽  
Blast Furnace Slag ◽  
Volcanic Ash ◽  
Strength Development ◽  
Main Process ◽  
Reaction Products ◽  
Setting Times ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

AbstractThis work aimed to evaluate the role of the addition of blast furnace slag for the formation of reaction products and the strength development of volcanic ash-based phosphate geopolymer. Volcanic ash was replaced by 4 and 6 wt% of ground granulated blast furnace slag to accelerate the reaction kinetics. Then, the influence of boric acid for controlling the setting and kinetics reactions was also evaluated. The results demonstrated that the competition between the dissolution of boric acid and volcanic ash-slag particles is the main process controlling the setting and kinetics reaction. The addition of slag has significantly accelerated the initial and final setting times, whereas the addition of boric acid was beneficial for delaying the setting times. Consequently, it also enhanced the flowability of the paste. The compressive strength increased significantly with the addition of slag, and the optimum replaced rate was 4 wt% which resulted in 28 d strength of 27 MPa. Beyond that percentage, the strength was reduced because of the flash setting of the binder which does not allow a subsequent dissolution of the particles and their precipitation. The binders formed with the addition of slag and/or boric acid are beneficial for the improvement of the water stability of the volcanic ash-based phosphate geopolymer.

Effect of Ground Granulated Blast Furnace Slag on Compressive Strength of POFA Blended Concrete

2015 ◽  
Vol 802 ◽  
pp. 142-148
Author(s):  
M.N. Noor Azline ◽  
Farah Nora Aznieta Abd Aziz ◽  
Arafa Suleiman Juma
Keyword(s):  
Compressive Strength ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Strength Development ◽  
Replacement Level ◽  
Concrete Compressive Strength ◽  
Cement Replacement ◽  
Granulated Blast Furnace Slag ◽  
Strength Tests ◽  
Furnace Slag

The article reports a laboratory experimental programme that investigated effect of ground granulated blast furnace (GGBS) on compressive strength of POFA ternary concrete. Compressive strength tests were performed at a range of cements combinations, including 100%PC, two POFA levels for binary concrete, 35% and 45%, and 15%GGBS inclusion for POFA ternary concrete. The compressive strength results were examined in comparison to PC only and equivalent POFA binary concretes for up to 28 days. Results show that the reduction in compressive strength is greater with the higher cement replacement level for all concretes particularly for POFA binary concretes. However, 15%GGBS in POFA blended concrete has a comparable compressive strength compared to PC concrete at both, 35% and 45%, cement replacement levels except for ternary concrete at 0.65 w/c. In addition, the compressive strength of ternary concrete is slightly higher compared to binary concrete for all concrete combinations. Although there is no significant noticeable influence on strength development, the presence of GGBS did not adverse the strength development of POFA blended concrete. Thus, it can be concluded that GGBS compensates the adverse effect of POFA at early strength development.

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