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Frontiers of Structural and Civil Engineering

Front. Struct. Civ. Eng.    2017, Vol. 11 Issue (4) : 406-411     https://doi.org/10.1007/s11709-016-0350-1
RESEARCH ARTICLE
Compressive strength and stability of sustainable self-consolidating concrete containing fly ash, silica fume, and GGBS
Osama Ahmed MOHAMED(), Omar Fawwaz NAJM
Department of Civil Engineering, Abu Dhabi University, Abu Dhabi, United Arab Emirates
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Abstract

This paper presents the findings of an experimental program seeking to understand the effect of mineral admixtures on fresh and hardened properties of sustainable self-consolidating concrete (SCC) mixes where up to 80% of Portland cement was replaced with fly ash, silica fume, or ground granulated blast furnace slag. Compressive strength of SCC mixes was measured after 3, 7, and 28 days of moist curing. It was concluded in this study that increasing the dosage of fly ash increases concrete flow but also decreases segregation resistance. In addition, for the water-to-cement ratio of 0.36 used in this study, it was observed that the compressive strength decreases compared to control mix after 28 days of curing when cement was partially replaced by 10%, 30%, and 40% of fly ash. However, a fly ash replacement ratio of 20% increased the compressive strength by a small margin compared to the control mix. Replacing cement with silica fume at 5%, 10%, 15%, and 20% was found to increase compressive strength of SCC mixes compared to the control mix. However, the highest 28 day compressive strength of 95.3 MPa occurred with SCC mixes in which 15% of the cement was replaced with silica fume.

Keywords fly ash      silica fume      ground granulated blast-furnace slag      self-consolidating concrete      and sustainable concrete     
Corresponding Author(s): Osama Ahmed MOHAMED   
Online First Date: 12 June 2017    Issue Date: 10 November 2017
 Cite this article:   
Osama Ahmed MOHAMED,Omar Fawwaz NAJM. Compressive strength and stability of sustainable self-consolidating concrete containing fly ash, silica fume, and GGBS[J]. Front. Struct. Civ. Eng., 2017, 11(4): 406-411.
 URL:  
http://journal.hep.com.cn/fsce/EN/10.1007/s11709-016-0350-1
http://journal.hep.com.cn/fsce/EN/Y2017/V11/I4/406
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Osama Ahmed MOHAMED
Omar Fawwaz NAJM
compositionrequirement (%)results (%)
loss on ignition –LOI3.00 max0.72
insoluble residue-IR1.5 max0.35
silicon dioxide- SiO2No limit34.24
alumina-Al2O3No limit13.75
iron oxide-Fe2O3No limit1.10
calcium oxide- CaONo limit42.26
magnesium oxide- MgO14.0 max5.88
sulfur trioxide-SO32.5 max0.24
sulphide sulfur –‘s’2.0 max0.65
sodium oxide- Na2ONo limit0.28
potassium oxide K2ONo limit0.32
chloride –Cl0.1 max0.008
manganese oxide- MnO2.0 max0.45
Tab.1  Chemical constituents of GGBS
element / propertiescontractual limits (%)
SIO2 (silicon dioxide, amorphous)min 92.0%
C (carbon)max 1.0%
Fe2O3 (iron oxide)max 1.5%
Al2O3 (aluminum oxide)max 1.0%
CaO (calcium oxide)max 0.75%
MgO (magnesium oxide)max 1.0%
K2O (potassium oxide)max 1.25%
Na2O (sodium oxide)max 0.8%
P2O5 (phosphorus pentoxide)max 0.05%
SO3 (sulfur trioxide)max 0.5%
Cl (chloride)max 0.1%
H2O (moisture, when packed)max 0.5%
L.O.I (loss on ignition) 750°Cmax 2.0%
L.O.I (loss on ignition) 950°Cmax 3.0%
coarse particles;>= 45 UM (325 Mesh)max 2.0%
pH-value (fresh)5.5-7.5
bulk density (when packed)250-350 kg/m3
(BET): SP surface area (M2/G)min 15%
Tab.2  Chemical constituents of silica fume
compositionresults (%)
silica (SiO2)55.0 – 65.0
alumina (Al2O2)25.0 – 35.0
iron (Fe2O)1.50 – 4.00
manganese (MnO)0.00 – 0.20
calcium (CaO)0.50 – 10.0
magnesium (MgO)0.50 – 2.5
potassium (K2O)0.00 – 1.00
titanium (TiO2)0.50 – 2.00
sodium oxide (Na2O)0.10 – 1.00
loss of ignition (LOI)0.10 – 2.50
Tab.3  Chemical constituents of fly ash
Fig.1  Sieve analysis results for coarse aggregates used in the study
mixcement (%)fly ash
(%)
silica fume (%)slag (%)T50 (s)VSIfinal diameter (cm)
control100.0%0.0%0.0%0.0%-045
FA1090.0%10.0%0.0%0.0%10.25054
FA1585.0%15.0%0.0%0.0%4.64160
FA2080.0%20.0%0.0%0.0%10.99253.5
FA2575.0%25.0%0.0%0.0%6.94257
FA3070.0%30.0%0.0%0.0%5.82257
FA4060.0%40.0%0.0%0.0%8255
SF595.0%0.0%5.0%0.0%-045
SF1090.0%0.0%10.0%0.0%19.6050
SF1585.0%0.0%15.0%0.0%7.16156
SF2080.0%0.0%20.0%0.0%5.48056
GS1090.0%0.0%0.0%10.0%8.85056
GS2575.0%0.0%0.0%25.0%12052
Tab.4  Binary SCC mixes containing cement, silica fume, or GGBS
GS3565.0%0.0%0.0%35.0%6.76152
GS4555.0%0.0%0.0%45.0%9.37151
GS5050.0%0.0%0.0%50.0%20.11050
GS6040.0%0.0%0.0%60.0%4.42159
GS7030.0%0.0%0.0%70.0%5.47253
GS8020.0%0.0%0.0%80.0%7.26158
Tab.5  Binary SCC mixes containing cement, silica fume, or GGBS (cont.)
Fig.2  Compressive strength for mixes where cement is replaced with fly ash
Fig.3  Strength of concrete where cement was partially replaced with 5%, 10%, 15%, and 20% silica fume
Fig.4  Compressive strength of SCC mixes where cement was partially replaced with 10%, 25%, 35%, 45%, 50%, 60%, 70%, and 80% GGBS
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