WORKSHOP on InSitu Compressive Strength of Concrete Structure

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WORKSHOP on In-Situ Compressive Strength of Concrete Structure by Sigma Test & Research Centre

WORKSHOP on In-Situ Compressive Strength of Concrete Structure by Sigma Test & Research Centre Delhi

Need for IN-PLACE Strength Testing During Construction The Traditional Cube test measures the potential

Need for IN-PLACE Strength Testing During Construction 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.

Strength of Structure Depends ü ü ü Transportation of concrete Pumping Casting Compaction Effective

Strength of Structure Depends ü ü ü Transportation of concrete Pumping Casting Compaction Effective curing Maturity developed on-site

In-Place Strength • Evaluation of in-place strength as per existing practice Testing Methods Limitations

In-Place Strength • 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.

Objective Pullout Test (ASTM C 900) Pullout test of concrete determines the compressive strength

Objective Pullout 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.

Pullout Test Method § 18 mm diameter hole is drilled into the concrete up

Pullout Test Method § 18 mm diameter hole is drilled into the concrete up to 65 mm depth. § With the help of special concrete router bit a 25 mm 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.

Ring Expansion Hardware NUT COILED RING CONE

Ring Expansion Hardware NUT COILED RING CONE

Commercial Test Systems

Commercial Test Systems

Recommended Number Of Tests (as per ASTM C 900) For Slabs § 5 Test

Recommended Number Of Tests (as per ASTM C 900) For Slabs § 5 Test points for every 465 m² of the surface area. For Columns and Beams § 5 Test points for every 115 m³ of concrete. ( Vol. of Col. : 300× 450× 3650 mm = 0. 49 cubic meter )

Applications ü To determine a minimum amount of curing needed in cold weather concreting.

Applications ü To determine a minimum amount of curing needed in cold weather concreting. ü For assessing existing structures. ü For planning Rehabilitation, Restrengthning work ü For estimating concrete strength during construction.

Correlation • Irrespective of failure theory, pullout strength is related to a fundamental strength

Correlation • 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.

Robust Correlation Not affected by: • • • Cementitious materials Water-cement ratio Age Air

Robust Correlation Not affected by: • • • Cementitious materials Water-cement ratio Age Air entrainment Admixtures Shape or size of aggregate up to 40 mm

Comparison Between Compressive Strength Test From Core , CAPO and Schmidt Hammer

Comparison Between Compressive Strength Test From Core , CAPO and Schmidt Hammer

Advantages § § § On the spot Results High Accuracy , Repeatability Consistent Results

Advantages § § § On the spot Results High Accuracy , Repeatability Consistent Results Non Destructive Helps in Localizing problem

Advantages “Speed of the overall construction programme can be Increased if an accurate assessment

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

CASE STUDIES Min of Textile , Government of Chad , Africa

CASE STUDIES Min of Textile , Government of Chad , Africa

CASE STUDIES § Samsung India - Sec 102, Noida 700000 Sq. ft. Area §

CASE STUDIES § Samsung India - Sec 102, Noida 700000 Sq. ft. Area § Times of India - Gurgaon § Luxor of International - Noida § Sri Ayurveda - Kotdwar , Uttaranchal

IS Reference

IS Reference

Reinforced Concrete Design Compressive Strength of Concrete fcrReinforced Concrete Design Compressive Strength of Concrete fcr
Module 3 1 HARDENED CONCRETE The compressive strengthModule 3 1 HARDENED CONCRETE The compressive strength
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Compressive and non compressive spinal cord syndrome DrCompressive and non compressive spinal cord syndrome Dr
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Types of Concrete Need of a concrete ConcreteTypes of Concrete Need of a concrete Concrete
ALASKA CONCRETE 2014 CONCRETE INTERSECTION Concrete Producers offerALASKA CONCRETE 2014 CONCRETE INTERSECTION Concrete Producers offer
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Pavements Concrete Concrete Rigid pavement Used where strengthPavements Concrete Concrete Rigid pavement Used where strength
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Strength Training Methods of evaluating strength Maximum strengthStrength Training Methods of evaluating strength Maximum strength
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