First to know: the Windsor Probe method, very widely / routinely used in the US from 1972 to the present
it is the fastest non-destructive strength test method in the world, which has a proven *ASTM and *Tse place in our country.
Under Normal conditions, when you go to a reinforced concrete building to get the core, at least 2 more people must go, except for the person who will get the core. According to urban transformation regulations, it is necessary to take at least 5 cores from a structure. This is a process that requires time. In addition, a person outside of coring must perform the necessary hammer tests with a concrete test hammer. At the same time, another person is needed to record the test hammer results. Only one person can perform the Windsor probe test.
According to the urban transformation regulations, it is necessary to buy at least 5 cores. The number of floors does not matter here. 5 core samples are taken continuously, whether 2-storey, 5-storey or 7-storey. But 5 core samples cannot accurately represent the quality of concrete in the entire structure. But the Windsor probe test is quite easy to apply, and since the application time is as short as about 5 minutes, it can be applied on all bearing elements in the structure (column, beam, slab, curtain, etc. application can be accomplished. In this way, the quality of concrete in the structure can be determined clearly and clearly.
During the process of taking a core sample from a structure, core samples are always taken from basements or carriers in the middle space in the structure. In order to determine the results that will represent the quality of concrete in the entire structure, it is necessary to take core from the upper floors. But the coring process is usually not found in the carrier elements on the upper floors.
Reinforcement is usually cut when taking a core sample. This also creates discontinuity in the reinforcement.
Processes such as coring, cutting the coring sample at the desired length/diameter ratio, water curing, captioning and then compressive strength are labor-intensive, time-consuming processes. Different methods are applied in the header making process. For example, sulfur-graphite head, epoxy head, head with gypsum, head with white cement, etc. applied header types. Epoxy is an expensive material. It can also increase epoxy head compressive strength. In the sulfur-graphite header method, the header preparation process is a laborious process. A serious odor appears in this method of heading.
According to the urban transformation regulation, companies accredited by the Ministry receive at least 5 cores when they go to the structure. However, a technical team does not examine the structure during coring. This is also a consideration to consider. It is also an important consideration whether the company actually conducts tests of core samples taken from the structure.
Burn 1 silver ramming probe and 1 capsule (energy unit) required in the experiment with the Windsor probe Tester. The fee is 16 usd..
The Windsor Probe test gives as good results as the core test, and it has been stated that it should be preferred as a method for determining the compressive strength of concrete.
By using the Windsor probe tester, it may be possible to determine the quality of concrete very quickly in special concretes, special structures.
Manufacturers of the Windsor probe Tester say that this method determines the compressive strength of concrete with a maximum error of 5%. In the Windsor probe penetration test method, concrete compressive strength is determined by measuring the penetration of a carefully controlled explosive-laden steel probe into the concrete surface and the depth of entry into the concrete. The less the probe enters from the surface, the better the concrete.
In addition to its fast and easy application, the Windsor probe penetration test method can be considered as a test method when determining the concrete compressive strength of a structure in terms of being more reliable than other non-destructive testing methods.
The Windsor probe tester can be applied in both low-strength, normal-strength and high-strength concretes. At the same time, the windsor probe test can also be applied in light concretes.
If the expected Cube concrete strength is less than 26 N/mm2, “low power” should be selected in the device. “Standard power” should be preferred for higher strength.
In this Test, aggregate hardness is variable that affects the penetration/strength relationship. The aggregate type also has an effect.
ADVANTAGES OF THE WINDSOR PROBE TEST FOR “READY-MIXED CONCRETE MANUFACTURERS” ;
In addition, the Windsor Probe is also a very suitable testing method for Ready-Mixed Concrete Manufacturers. Because the Windsor probe can be applied when the mold is removed from the concrete, it is a very effective method of determining the strength property of the concrete at an early age.
The Windsor Probe can determine the compressive strength properties of concrete thicknesses from 25 mm to 75 mm.
And the Windsor Probe can do only and only 8 mm of damage to the carrier element.
The most important feature is that the variable coefficient is lower than the core test results of the windsor probe method.
This is as follows. The compressive strength at every point along the height at a column or curtain is not the same. A sample is usually taken from the middle part of the carrier element when applying a core test. But compressive strength can vary in other parts. For this reason, the windsor probe test can be easily applied at any point along the height of the carrier element. IN FACT, THIS ASPECT IS VERY IMPORTANT. With this aspect of the Windsor Probe, it is able to give a much more valid idea of whether there is sweating and segregation in the carrier element.
This is very important. Because there is systematic strength variability in concrete.
Respectfully,
NOTLAR:
*1) ASTM-C803
Standart T.Method for Penetration
Resistance of Hardened Concrete
*2) TSE 13537 (Aralik2012) Sertlesmis Betonun Batma Direncinin Tayini icin Deney Yontemi
3) Turkey and Middle East one authorized sales and Warranty-Service Authority FORE International Joint Stock Company ( www.foreas.com)
4) for domestic and foreign scientific studies/articles/references, please do not hesitate to contact us.
5) For detailed (Turkish) application video:
Respectfully,
FORE International Joint Stock Company
/ JAMES Ins. ( USA ) –
”Advanced NDT Testing Technologies” www.foreas.com