Mozuru Dick Engineer and international traveler interested in construction techniques, problems and proper design. The specification also offers guidelines for physical requirements, sampling and testing, visual inspection, and rejection of specimens. Are you an Engineering professional? I am sure they have had units tested in a lab somewhere that may have an acceptable machine to test such a long unit if the ASTM standards were used. Local sellers, however, should be consulted as to availability of units having the desired features.
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Dear All, Kindly help me with your expertise knowledge in the below questions. BS mention specifically about face mix concrete pavers.
How important is the split tensile strength test for concrete pavers? Which abrasion resistance test is more recommended for concrete unit pavers? If yes which standard is referred for this type of pavers? The use of pavers made using a wet cast method is not common because the wet cast units are probably not cost effective. There are also very few if any manufacturers that meet the standards for the installation requirements. ASTM usually does not get involved in manufacturing processes, but only specifies the minimum standards of the units.
The face layer does present some problems regarding determining durability testing, but does not preclude the use of a face layer, since it is a standard for type of construction material. In my opinion, the standard is very minimal and the demands of the specifiers and contractors over-ride the of the ASTM standard.
There are some features incorporated in the design of the paving units are not even addressed in C The psi compressive strength requirement is very low and a manufacturer could not afford to make the minimal units because this would require compromising other factors including handling and installation. A typical concrete brick could be 12, psi.
The tensile splitting test is of no value since the pavers never see a similar loading because of the restraint and effects of the surrounding units. The compressive strength is far below the level of the usual manufacturing equipment.
Dick Engineer and international traveler interested in construction techniques, problems and proper design. I agree with you that the standard is very minimal, but when we deal the subject in construction contracts,though we specify the product with manufacturer name,the reference to International standards becomes mandatory.
I am talking about case in middle east. I am working in Kuwait. As you said,Tensile split strength has little effect if the pavers are of interlocking type. This paver is a long one, size mm x 72mm x mm,which has great potential for tensile splitting. Is there any ASTM standard which has mention about face mix type 2 layer semi dry cast concrete pavers?
What is common practice in US? Kindly share your experience and knowledge. RE: ASTM Standard for Concrete Unit pavers 22 Sep 17 sudhirvasan - If you refer to a standard ASTM or others in your specifications, make sure you understand the specification and note the requirements that are excluded or waived for your specific use. In your case, the ASTM contains a requirement that the the length to thickness of the unit be less than 4.
This can effect the applicability of this factor based on the testing of the sample you referred to. I am sure they have had units tested in a lab somewhere that may have an acceptable machine to test such a long unit if the ASTM standards were used. To my knowledge, the the units you have visualized are not the typical "interlocking concrete pavers" that the specification written for, which is for heavy loads wheel loads than can be carried if installed properly.
Perhaps the supplier you mentioned can address the variation if they are active in writing the ASTM standard.
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ASTM C 936