workshop on in-situ compressive strength of concrete structure by sigma test & research centre...
TRANSCRIPT
![Page 1: WORKSHOP on In-Situ Compressive Strength of Concrete Structure by Sigma Test & Research Centre Delhi](https://reader035.vdocument.in/reader035/viewer/2022062303/5518c421550346a61f8b56f3/html5/thumbnails/1.jpg)
WORKSHOPon
In-Situ Compressive Strengthof
Concrete Structureby
Sigma Test & Research CentreDelhi
![Page 2: WORKSHOP on In-Situ Compressive Strength of Concrete Structure by Sigma Test & Research Centre Delhi](https://reader035.vdocument.in/reader035/viewer/2022062303/5518c421550346a61f8b56f3/html5/thumbnails/2.jpg)
The Traditional Cube test measures the potential compressive strength of a given mix after 28 days , when the concrete under ideal laboratory conditions is compacted and cured in water at 27° Celsius.
Need for IN-PLACE Strength Testing During Construction
![Page 3: WORKSHOP on In-Situ Compressive Strength of Concrete Structure by Sigma Test & Research Centre Delhi](https://reader035.vdocument.in/reader035/viewer/2022062303/5518c421550346a61f8b56f3/html5/thumbnails/3.jpg)
Strength of Structure Depends
Transportation of concrete Pumping Casting Compaction Effective curing Maturity developed on-site
![Page 4: WORKSHOP on In-Situ Compressive Strength of Concrete Structure by Sigma Test & Research Centre Delhi](https://reader035.vdocument.in/reader035/viewer/2022062303/5518c421550346a61f8b56f3/html5/thumbnails/4.jpg)
• Evaluation of in-place strength as per existing practice
Testing Methods Limitations
Core drilling Destructive Test, High Measurement Time.
Rebound hammer High Uncertainty, Measures surface Hardness.
Ultrasonic Pulse Velocity Test Qualitative Test, Low Coverage.
![Page 5: WORKSHOP on In-Situ Compressive Strength of Concrete Structure by Sigma Test & Research Centre Delhi](https://reader035.vdocument.in/reader035/viewer/2022062303/5518c421550346a61f8b56f3/html5/thumbnails/5.jpg)
ObjectivePullout Test (ASTM C 900)
Pullout test of concrete determines the compressive strength of concrete as available at site taking into account all the variables outlined earlier for a direct comparison with the results of standards compression test as measured at the ready-mix plant under ideal laboratory conditions.
![Page 6: WORKSHOP on In-Situ Compressive Strength of Concrete Structure by Sigma Test & Research Centre Delhi](https://reader035.vdocument.in/reader035/viewer/2022062303/5518c421550346a61f8b56f3/html5/thumbnails/6.jpg)
Pullout Test Method
18 mm diameter hole is drilled into the concrete up to 65mm depth.
With the help of special concrete router bit a 25mm diameter slot is made.
An expandable metal washer is placed in a hole and ring is expanded.
The expanded washer is then pulled out of the concrete using the pull out loading system.
![Page 7: WORKSHOP on In-Situ Compressive Strength of Concrete Structure by Sigma Test & Research Centre Delhi](https://reader035.vdocument.in/reader035/viewer/2022062303/5518c421550346a61f8b56f3/html5/thumbnails/7.jpg)
![Page 8: WORKSHOP on In-Situ Compressive Strength of Concrete Structure by Sigma Test & Research Centre Delhi](https://reader035.vdocument.in/reader035/viewer/2022062303/5518c421550346a61f8b56f3/html5/thumbnails/8.jpg)
![Page 9: WORKSHOP on In-Situ Compressive Strength of Concrete Structure by Sigma Test & Research Centre Delhi](https://reader035.vdocument.in/reader035/viewer/2022062303/5518c421550346a61f8b56f3/html5/thumbnails/9.jpg)
![Page 10: WORKSHOP on In-Situ Compressive Strength of Concrete Structure by Sigma Test & Research Centre Delhi](https://reader035.vdocument.in/reader035/viewer/2022062303/5518c421550346a61f8b56f3/html5/thumbnails/10.jpg)
NUT
COILED RING
CONE
Ring Expansion Hardware
![Page 11: WORKSHOP on In-Situ Compressive Strength of Concrete Structure by Sigma Test & Research Centre Delhi](https://reader035.vdocument.in/reader035/viewer/2022062303/5518c421550346a61f8b56f3/html5/thumbnails/11.jpg)
Commercial Test Systems
![Page 12: WORKSHOP on In-Situ Compressive Strength of Concrete Structure by Sigma Test & Research Centre Delhi](https://reader035.vdocument.in/reader035/viewer/2022062303/5518c421550346a61f8b56f3/html5/thumbnails/12.jpg)
![Page 13: WORKSHOP on In-Situ Compressive Strength of Concrete Structure by Sigma Test & Research Centre Delhi](https://reader035.vdocument.in/reader035/viewer/2022062303/5518c421550346a61f8b56f3/html5/thumbnails/13.jpg)
Recommended Number Of Tests(as per ASTM C900)
For Slabs
5 Test points for every 465m² of the surface area.
For Columns and Beams
5 Test points for every 115m³ of concrete. ( Vol. of Col.: 300×450×3650 mm = 0.49 cubic meter )
![Page 14: WORKSHOP on In-Situ Compressive Strength of Concrete Structure by Sigma Test & Research Centre Delhi](https://reader035.vdocument.in/reader035/viewer/2022062303/5518c421550346a61f8b56f3/html5/thumbnails/14.jpg)
Applications
To determine a minimum amount of curing needed in cold weather concreting.
For assessing existing structures. For planning Rehabilitation, Restrengthning work For estimating concrete strength during construction.
![Page 15: WORKSHOP on In-Situ Compressive Strength of Concrete Structure by Sigma Test & Research Centre Delhi](https://reader035.vdocument.in/reader035/viewer/2022062303/5518c421550346a61f8b56f3/html5/thumbnails/15.jpg)
• Irrespective of failure theory, pullout strength is related to a fundamental strength parameter of concrete .
• There is good correlation between pullout strength and compressive strength .
![Page 16: WORKSHOP on In-Situ Compressive Strength of Concrete Structure by Sigma Test & Research Centre Delhi](https://reader035.vdocument.in/reader035/viewer/2022062303/5518c421550346a61f8b56f3/html5/thumbnails/16.jpg)
Not affected by:
• Cementitious materials • Water-cement ratio • Age • Air entrainment • Admixtures • Shape or size of aggregate up to 40 mm
![Page 17: WORKSHOP on In-Situ Compressive Strength of Concrete Structure by Sigma Test & Research Centre Delhi](https://reader035.vdocument.in/reader035/viewer/2022062303/5518c421550346a61f8b56f3/html5/thumbnails/17.jpg)
![Page 18: WORKSHOP on In-Situ Compressive Strength of Concrete Structure by Sigma Test & Research Centre Delhi](https://reader035.vdocument.in/reader035/viewer/2022062303/5518c421550346a61f8b56f3/html5/thumbnails/18.jpg)
![Page 19: WORKSHOP on In-Situ Compressive Strength of Concrete Structure by Sigma Test & Research Centre Delhi](https://reader035.vdocument.in/reader035/viewer/2022062303/5518c421550346a61f8b56f3/html5/thumbnails/19.jpg)
Comparison Between Compressive Strength Test From Core , CAPO and Schmidt Hammer
![Page 20: WORKSHOP on In-Situ Compressive Strength of Concrete Structure by Sigma Test & Research Centre Delhi](https://reader035.vdocument.in/reader035/viewer/2022062303/5518c421550346a61f8b56f3/html5/thumbnails/20.jpg)
On the spot Results High Accuracy , Repeatability Consistent Results Non Destructive Helps in Localizing problem
Advantages
![Page 21: WORKSHOP on In-Situ Compressive Strength of Concrete Structure by Sigma Test & Research Centre Delhi](https://reader035.vdocument.in/reader035/viewer/2022062303/5518c421550346a61f8b56f3/html5/thumbnails/21.jpg)
Advantages
“Speed of the overall construction programme can be
Increased if an accurate assessment of the early-age in – situ strength is made because this allows a much faster turn around”.
Dept. of Civil Engineers
The University of Liverpool
![Page 22: WORKSHOP on In-Situ Compressive Strength of Concrete Structure by Sigma Test & Research Centre Delhi](https://reader035.vdocument.in/reader035/viewer/2022062303/5518c421550346a61f8b56f3/html5/thumbnails/22.jpg)
Min of Textile , Government of Chad , Africa
CASE STUDIES
![Page 23: WORKSHOP on In-Situ Compressive Strength of Concrete Structure by Sigma Test & Research Centre Delhi](https://reader035.vdocument.in/reader035/viewer/2022062303/5518c421550346a61f8b56f3/html5/thumbnails/23.jpg)
Samsung India - Sec 102, Noida
700000 Sq. ft. Area
Times of India - Gurgaon
Luxor of International - Noida
Sri Sri Ayurveda - Kotdwar , Uttaranchal
CASE STUDIES
![Page 24: WORKSHOP on In-Situ Compressive Strength of Concrete Structure by Sigma Test & Research Centre Delhi](https://reader035.vdocument.in/reader035/viewer/2022062303/5518c421550346a61f8b56f3/html5/thumbnails/24.jpg)
IS Reference
![Page 25: WORKSHOP on In-Situ Compressive Strength of Concrete Structure by Sigma Test & Research Centre Delhi](https://reader035.vdocument.in/reader035/viewer/2022062303/5518c421550346a61f8b56f3/html5/thumbnails/25.jpg)