YODSUDJAI - Mechanical Properties of Newly Developed ...
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W. YODSUDJAI Mechanical Properties of Newly developed Repair Materials Mechanical Properties of Newly developed Repair Materials Department of Civil Engineering Faculty of Engineering Kasetsart University, Thailand
Transcript of YODSUDJAI - Mechanical Properties of Newly Developed ...
W. YODSUDJAI
Mechanical Properties of Newly developed Repair Materials
Mechanical Properties of Newly developed Repair Materials
Department of Civil EngineeringFaculty of Engineering
Kasetsart University, Thailand
Background
Deterioration of reinforced concrete structures
Background
Consideration must first be given to the cause of the problem for repairing the deteriorated structuresNeed of appropriate repair materials Global warming less energy consumption
GeopolymerA geopolymer can be defined as .the material that results from the geosynthesis of polymeric alumino-silicates and alkali-silicates, yielding a three-dimensional polymeric framework of linked SiO4 and AlO4 tetrahedra.An aluminosilicate material can be dissolved in an alkali-silicate solution to form a rock hard brittle ceramic.
www.vcharkarn.com/vcafe/147148
to determine the mechanical properties of geopolymer mortar for using as
the repair material
ObjectiveObjective
1. Testing of Geopolymer mortar engineering properties
2. Comparative testing of engineering properties of geopolymer mortar with the commercial repair mortar
Scope of WorkScope of Work
Properties of Repair Materials
Noel Mailvaganam and Lyndon Mitchell,2003.Repairs to Restore Serviceability in Concrete Structures.Construction Technology Update No.59. October ISSN 1206-1220. Institute for Research in Construction,National Research Council of Canada, Ottawa, Canada
Compare with
Tensile Strength
Experimental ProgramExperimental Program
Cube specimen 5 × 5 × 5 cm.
Compare with
Tensile Strength
Prism specimen 4 × 4 × 16 cm.
Compressive and Flexural Strength Tests
Cylindrical Specimens φ 5 x 10 cm.
Bond Strength by Slant Shear Test
Mix proportion of geopolymer mortar by varying sand content
0.58404047687367046726401.1GM 21 – GM 25
0.60404047687367046726401.0GM 16 – GM 20
0.63404047687367046726400.9GM 11 – GM 15
0.67404047687367046726400.8GM 6 – GM 10
0.71404047687367046726400.7GM 1 – GM 5
W/BWaterFlyashsandsandsandsandSand
Materials (kg/m3)
RatioNa2O.SiO3/NaOH
Mix Symbol
Mix proportion of geopolymer mortar by varying water content
0.56304047041.1GM 31
0.58304047041.0GM 30
0.61304046720.9GM 29
0.57354047041.1GM 28
0.59354047041.0GM 27
0.62354046720.9GM 26
W/BWaterFly ashsand
Materials (kg/m3)
RatioNa2O.SiO3/NaOH
Mix Symbol
Mix proportion of geopolymer mortar by varying size of sand
0.5630404564105351.1GM 37
0.5830404564105351.0GM 36
0.6130404539100330.9GM 35
0.5735404564105351.1GM 34
0.5935404564105351.0GM 33
0.6235404539100330.9GM 32
W/BWaterFly ash
Sandpassing
sieveNO.30
Sandpassing
sieveNO.50
Sandpassing
sieveNO.100
Materials (kg/m3)
RatioNa2O.SiO3/NaOH
Mix Symbol
Properties : Cement containing short fiber with high compressive and bonding strengths
Use : Concrete surface patching repair
Mix proportion : Mortar 5 kg. / Water 1.5 - 2.0 liters
Commercial Repair Material
Commercial Repair Material
0
100
200
300
400
500
600
700
Co
mp
ress
ive
stre
ng
th, k
sc
GM 32 GM 36 GM 37 CRM-1 CRM-2
Types of Repair mortar
1 Day 7 Days 14 Days 28 Days
Compressive Strength
Experimental ResultsExperimental Results
0
10
20
30
40
50
60
Fle
xu
ral
stre
ng
th, k
sc
GM 32 GM 36 GM 37 CRM-1 CRM-2
Types of Repair mortar
1 Day 7 Days 14 Days 28 Days
Flexural Strength
020406080
100120140160180
Bon
d St
reng
th, k
sc
GM 32 GM 36 GM 37 CRM-1 CRM-2
Types of Repair mortar
1 Day 7 Days 14 Days 28 Days
Bond Strength
0
10
20
30
40
50
60
GM 32 GM 36 GM 37
Types of Repair mortar
Tim
e, M
inu
tes
Initial Setting Time Final Setting Time
Setting Time
Chloride Penetration Test
CRM 1 CRM 2
GEOPOLYMER MORTAR
0
0.5
1
1.5
2
2.5
3
Chl
orid
e pe
netr
ate
Rat
e,
cm
GM 32 GM 36 GM 37 CRM-1 CRM-2 Cementmortar
Types of Repair mortars
7 Days 14 days 28 Days
Chloride Penetration Depth
It is possible to produce the geopolymermortar with the 400 ksc compressive strength at the age of 28 days.The compressive strength, flexural strength and bond strength of the geopolymer mortar develop moderately before 28 days.The flexural strength and bond strength of the geopolymer mortar are closed to those of the conventional repair materials at the age of 28 days.
ConclusionsConclusions
The setting time of the geopolymer mortar is short for the casting operation.The chloride penetration resistance of conventional repair materials is better than that geopolymer mortars at the age of 28 days.
ConclusionsConclusions
The authors would like to acknowledge the Thailand Research Fund (TRF) for financial support.
Acknowledgements Acknowledgements
