Concrete Maturity | Estimating the Real-Time Concrete Strength
-
Upload
aali-r-alizadeh -
Category
Engineering
-
view
128 -
download
0
Transcript of Concrete Maturity | Estimating the Real-Time Concrete Strength
![Page 1: Concrete Maturity | Estimating the Real-Time Concrete Strength](https://reader035.fdocuments.net/reader035/viewer/2022062900/58ed35561a28ab75618b46a1/html5/thumbnails/1.jpg)
The Maturity MethodPredicting Early Age Strength of Concrete
© Giatec Scientific Inc., 2015
![Page 2: Concrete Maturity | Estimating the Real-Time Concrete Strength](https://reader035.fdocuments.net/reader035/viewer/2022062900/58ed35561a28ab75618b46a1/html5/thumbnails/2.jpg)
Early Age Strength Challenge !
SpeedSafety
![Page 3: Concrete Maturity | Estimating the Real-Time Concrete Strength](https://reader035.fdocuments.net/reader035/viewer/2022062900/58ed35561a28ab75618b46a1/html5/thumbnails/3.jpg)
Construction Sequence
![Page 4: Concrete Maturity | Estimating the Real-Time Concrete Strength](https://reader035.fdocuments.net/reader035/viewer/2022062900/58ed35561a28ab75618b46a1/html5/thumbnails/4.jpg)
Formwork Removal
![Page 5: Concrete Maturity | Estimating the Real-Time Concrete Strength](https://reader035.fdocuments.net/reader035/viewer/2022062900/58ed35561a28ab75618b46a1/html5/thumbnails/5.jpg)
Casting Next Floor !
![Page 6: Concrete Maturity | Estimating the Real-Time Concrete Strength](https://reader035.fdocuments.net/reader035/viewer/2022062900/58ed35561a28ab75618b46a1/html5/thumbnails/6.jpg)
The Tail of Two “T”s
TemperatureTime
![Page 7: Concrete Maturity | Estimating the Real-Time Concrete Strength](https://reader035.fdocuments.net/reader035/viewer/2022062900/58ed35561a28ab75618b46a1/html5/thumbnails/7.jpg)
Combined effect of Time and Temperature
0 5 10 15 20 25 300
2
4
6
8
10
12
14
16
Age
Com
pres
sive
Stre
ngth
0 10 20 30 40 50 6018
19.5
21
22.5
24
25.5
27
28.5
30
Age
Tem
pera
ture
Nurse, R.W., Steam curing of concrete, Mag. Concr. Res., 1(2), 79, 1949.
![Page 8: Concrete Maturity | Estimating the Real-Time Concrete Strength](https://reader035.fdocuments.net/reader035/viewer/2022062900/58ed35561a28ab75618b46a1/html5/thumbnails/8.jpg)
Maturity Functions: Nurse-Saul
0 10 20 30 40 50 6018
21
24
27
30
Age
Tem
pera
ture
T0
t
Datum Temperature
𝑀 (𝑡 )=∑ (𝑇 −𝑇0 ) . ∆𝑡
Saul, A.G.A., Principles underlying the steam curing of concrete at atmospheric pressure, Mag. Concr. Res., 2(6), 127, 1951.
![Page 9: Concrete Maturity | Estimating the Real-Time Concrete Strength](https://reader035.fdocuments.net/reader035/viewer/2022062900/58ed35561a28ab75618b46a1/html5/thumbnails/9.jpg)
Maturity Functions: Equivalent Age
0 2 4 6 8 10 12 14 16 18 20 22 24 26 280
3
6
9
12
15
Equivalent age at Tr
Stre
ngth
𝑡𝑒=∑ (𝑇 −𝑇 0 )
(𝑇𝑟 −𝑇 0 )∆𝑡
Based on Linear Relationship
𝑡𝑒=∑0
𝑡
𝑒−𝑄 ( 1𝑇 − 1𝑇 𝑟 )∆𝑡
Based on Arrhenius Equation
: Reference TemperatureQ: Activation Energy
![Page 10: Concrete Maturity | Estimating the Real-Time Concrete Strength](https://reader035.fdocuments.net/reader035/viewer/2022062900/58ed35561a28ab75618b46a1/html5/thumbnails/10.jpg)
Strength – Maturity Relationships
1
37
1428
0 5 10 15 20 25 300
2
4
6
8
10
12
14
16
Age
Com
pres
sive
Stre
ngth
Samples should be cured in water bath or in the moist room.
![Page 11: Concrete Maturity | Estimating the Real-Time Concrete Strength](https://reader035.fdocuments.net/reader035/viewer/2022062900/58ed35561a28ab75618b46a1/html5/thumbnails/11.jpg)
Strength – Maturity Relationships
0 10 20 30 40 50 6018
19.5
21
22.5
24
25.5
27
28.5
30
Age
Tem
pera
ture
![Page 12: Concrete Maturity | Estimating the Real-Time Concrete Strength](https://reader035.fdocuments.net/reader035/viewer/2022062900/58ed35561a28ab75618b46a1/html5/thumbnails/12.jpg)
Strength – Maturity Relationships
0 7 14 21 280
5
10
15
Age
Com
pres
sive
Stre
ngth
0 20 40 600
200400600800
100012001400160018002000
Age
Mat
urity
Inde
x
2 3 4 50
10
20
30
f(x) = 10.902149510791 x − 23.329011002221
Log (Maturity Index)
Com
pres
sive
Stre
ngth
![Page 13: Concrete Maturity | Estimating the Real-Time Concrete Strength](https://reader035.fdocuments.net/reader035/viewer/2022062900/58ed35561a28ab75618b46a1/html5/thumbnails/13.jpg)
Standards and GuidelinesASTM C 1074
The Standard test procedure to Maturity Method
Building Codes ACI 318: 6-2: Removal of forms, shores, and reshoring CSA A23.2.14C / A23.2-15: Removal of shores and forms
Test has been adapted by several DOTs across the North America
![Page 14: Concrete Maturity | Estimating the Real-Time Concrete Strength](https://reader035.fdocuments.net/reader035/viewer/2022062900/58ed35561a28ab75618b46a1/html5/thumbnails/14.jpg)
![Page 15: Concrete Maturity | Estimating the Real-Time Concrete Strength](https://reader035.fdocuments.net/reader035/viewer/2022062900/58ed35561a28ab75618b46a1/html5/thumbnails/15.jpg)
A new Approach to Maturity Measurement
“SmartRock™ wireless concrete sensor”
![Page 16: Concrete Maturity | Estimating the Real-Time Concrete Strength](https://reader035.fdocuments.net/reader035/viewer/2022062900/58ed35561a28ab75618b46a1/html5/thumbnails/16.jpg)
Limitations
Strength of In-place Concrete Lab cured Samples
High Early-Age Temperatures
Datum Temperature
![Page 17: Concrete Maturity | Estimating the Real-Time Concrete Strength](https://reader035.fdocuments.net/reader035/viewer/2022062900/58ed35561a28ab75618b46a1/html5/thumbnails/17.jpg)
Field Practice
![Page 18: Concrete Maturity | Estimating the Real-Time Concrete Strength](https://reader035.fdocuments.net/reader035/viewer/2022062900/58ed35561a28ab75618b46a1/html5/thumbnails/18.jpg)
Field Practice
![Page 19: Concrete Maturity | Estimating the Real-Time Concrete Strength](https://reader035.fdocuments.net/reader035/viewer/2022062900/58ed35561a28ab75618b46a1/html5/thumbnails/19.jpg)
Field Practice
![Page 20: Concrete Maturity | Estimating the Real-Time Concrete Strength](https://reader035.fdocuments.net/reader035/viewer/2022062900/58ed35561a28ab75618b46a1/html5/thumbnails/20.jpg)
Field Practice
Age
Tem
pera
ture
Age
Mat
urity
Inde
x
![Page 21: Concrete Maturity | Estimating the Real-Time Concrete Strength](https://reader035.fdocuments.net/reader035/viewer/2022062900/58ed35561a28ab75618b46a1/html5/thumbnails/21.jpg)
Field Practice
Age
Tem
pera
ture
Age
Mat
urity
Inde
x
Maturity IndexC
ompr
essi
ve S
treng
th
𝒇 𝒄′ =𝑎+𝑏 . log (𝑀 )
![Page 22: Concrete Maturity | Estimating the Real-Time Concrete Strength](https://reader035.fdocuments.net/reader035/viewer/2022062900/58ed35561a28ab75618b46a1/html5/thumbnails/22.jpg)
R&D Department | Giatec Scientific Inc.301 Moodie Dr., Suite 302Ottawa, ON, K2H 9C4 Canada
Tel: (613) 240 – 7451Email: [email protected]
Read More @ http://bit.ly/1Kq2qAe