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My architect is questioning my ability to obtain a light weight block with a compressive strength of 3500 psi. Can you clarify? First you need to make sure you understand what is being required. We are assuming we are discussing a individual block with a net area compressive strength of 3500 psi. If that is the case then there is no problem. Lightweight high strength block in that range are manufactured every day.
On the other hand, if an f'm=3500psi is what the specifier has in mind the answer would be no. Not available in any weight block, light or not. And not recommended if it was. f'm=3500 psi is literaly "off the chart"! That is the chart in Table 2 of TMS 602-16 which is the current masonry code in the FBC 6th Ed.
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How do Interpret Table 2 in TMS 602-16 in order to get the required net area compressive strength of an individual block for a specified f'm?I have included an article below explaining the increased block strength. It includes a copy of Table 2 so that you can reference it as you read this. The values of f'm are listed in the left most column and are labeled "Net area compressive strength of concrete masonry". Values are given in psi. The right hand two columns give the required Net area strength of the individual unit to achieve the given f'm. The far right column is to be used if Type "N" mortar is used to lay up the wall and the middle column is used if Type M or S mortar is used in the wall. Thus, an individual block with a net area strength of 2000 psi gives you an f'm = 2000 psi. An individual block with a net area strength of 3250 psi gives you an f'm = 2500 psi. And an individual block with a net area strength of 3900 psi gives you an f'm = 2750 psi. Links to additional information:
Update on Increased Design Strength of CMU 1-3-18 with Attachment 1.pdf What strength do I need on my individual block to attain an f'm=2500 psi? Under the FBC-Building 5th Edition you required an individual block strength of 3750psi to attain an f'm=2500. Under the new 6th Edition Florida Code you only need a strength of 3250 psi. The change is in Table 2 in TMS 602-16. The strength of masonry was increased by about 35% from the TMS 602-11 which was the Masonry Standard referenced in the 5th Ed FBC-Building.
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