-
8/10/2019 ECOCEM
1/24
Greener and stronger foundationsas a result of using GGBS
cement
David OFlynn [email protected] 087 9654891
mailto:[email protected]:[email protected]
-
8/10/2019 ECOCEM
2/24
Ecocem Ireland
-
8/10/2019 ECOCEM
3/24
Brief History of GGBS
1862: Hydraulic potential of GGBS discovered in Germany
Early 1900s - Portland Blast Furnace Cements had an
establishedplace in the concrete market
2004: More than 5,000,000 tonnes of GGBS produced in Germany
2006: Approximately 2,000,000 tonnes of GGBS produced in UK
2008: Over 400,000 tonnes available in Ireland
-
8/10/2019 ECOCEM
4/24
GGBS Manufacture
-
8/10/2019 ECOCEM
5/24
GGBS - Environment
-
8/10/2019 ECOCEM
6/24
GGBS - Environment
CO2
emissions for GGBS and cement productionTypical CO2 Emissions
for Portland Cement and GGBS Production
(Figures in kg per tonne of output)
0
100
200
300
400
500
600
700
800
900
Portland Cement GGBS
Other energy used
Fossil Fuel Use
Process Emissions
kgperTonneofOutput
-
8/10/2019 ECOCEM
7/24
Environmental Savings
EquivalentCO2 79.4 tonnes 25 Cars or 10 acres of
mature forestry/yearSO2 245 kg
NOx 343 kgCO 245 kgPM10 42.7 kgEnergy 94,000 kwh Power 18 homes
for
one year
Limestone/
Shale
160 tonnes
www.ecocem.ie
Environmental savings per typical base
http://www.ecocem.ie/http://www.ecocem.ie/
-
8/10/2019 ECOCEM
8/24
GGBS Controlling thermalcracking
-
8/10/2019 ECOCEM
9/24
Controlling thermal cracking
Image courtesy of Wind Farm Civils
-
8/10/2019 ECOCEM
10/24
Controlling thermal cracking
-
8/10/2019 ECOCEM
11/24
Heat of Hydration
GGBS lowers peak and overall heat
Substitution level 70%
-
8/10/2019 ECOCEM
12/24
Controlling thermal cracking
0% GGBS
26 degrees
30% GGBS25 degrees
50% GGBS23 degrees
70% GGBS19 degrees
Maximum temperature differential on 1500mm deep base
-
8/10/2019 ECOCEM
13/24
Controlling thermal cracking
20m x 20m x 2.4 m deep base with 70% GGBS
0
10
20
30
40
50
60
Highest
Lowest
Difference
-
8/10/2019 ECOCEM
14/24
Controlling thermal cracking
Image courtesy of Wind Farm Civils
-
8/10/2019 ECOCEM
15/24
Controlling thermal cracking
Maximise use of GGBS to reduce heat generated
Install and monitor thermocouples
Insulate if required
Minimise placing temperature
Cover with plastic sheeting to protect from wind
Remove insulation in stages
-
8/10/2019 ECOCEM
16/24
GGBS strength benefits
-
8/10/2019 ECOCEM
17/24
Long term strength development
15
25
35
45
55
65
75
85
95
0 20 40 60 80 100 120 140 160 180 200
N/mm2
Days
42.5 & 50% GGBS
42.5
-
8/10/2019 ECOCEM
18/24
Temperature matched curing
1.1m deep base with 70% GGBS
0
5
10
15
20
25
30
35
40
45
50
1 2 3 4
StrengthN/mm2
Foundation Slab: C40/50 @ 70% GGBS
Standard TMCDay Age
-
8/10/2019 ECOCEM
19/24
GGBS Durability benefits
-
8/10/2019 ECOCEM
20/24
Durability increased resistance to acids
Peaty soils acidic environment 0% GGBS
30% GGBS
50% GGBS
-
8/10/2019 ECOCEM
21/24
Durability increased resistance to sulphates
-
8/10/2019 ECOCEM
22/24
Durability increased resistance to salts
Marine Environment
Lower chloride ion diffusivity
Lower porosity/permeability
-
8/10/2019 ECOCEM
23/24
Durability increased resistance to salts
BS 6349 Maritime Structures Table 22
-
8/10/2019 ECOCEM
24/24
Summary
Environmental Positive PR
Assist with planning applications
Consistent ethos
Reduced risk of cracking
Longer life
Reduced maintenance
Increased long term strength
Improved durability
Increased resistance to attack in peaty/acidic environments
Increased resistance to attack in marine environments
David OFlynn [email protected] 087 9654891
mailto:[email protected]:[email protected]
