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  3. I'm not sure this is the right forum for this kind of question, but I'm wondering if there are any manufacturers using a high pressure, water washout for their mixer? In particular, we have an 80 cu ft Besser ribbon-style mixer, and I'm wondering if anyone has tried a high pressure washout with this kind of mixer with any success or if you have any comments?
  4. I am having a heated argument with the G.C. on a project we are supplying the reinforcing on, In the General notes under Concrete Masonry. FILLED CELLS SHALL BE FILLED WITH 3000 psi GROUT AS PER ACI 530-11 AND ACI 530.1-11. FILLING OF CELLS SHALL BE DONE IN MAX. FOUR FOOT LIFTS WITH A MAXIMUM POUR OF 12 FEET. USE MECHANICAL VIBRATION TO ACHIEVE GROUT FILLED CELLS. Now our contention is that this would be considered "low lift grouting" and the reinforcing bars would be 4 feet + the required lap, the bars should not go from floor to floor + a lap as the G.C. contends that they should, in all the years I have in the reinforced concrete area low "lifts" are done in this way. What is your take on this?
  5. The electrical conduit may be exposed (provided they are rated for such applications), which is common in retrofit applications or where aesthetics are not critical. Alternatively utilities can be run through the cells of the units allowing for the outlet boxes to be mounted on the surface of the assembly or flush mounted.
  6. 6 inch loadbearing CMU in low-rise construction is very feasible (and a system I personally feel is underutilized for many common applications). Structurally their design is the same as any other block size. The only unique consideration with 6 inch CMU (as with 10, 12, or other block sizes other than 8 inch) is maintaining bond when turning corners, etc.
  7. How are electrical outlets handled with single wythe CMU wall types with no further interior finishes (ie dry wall), are the conduits exposed?
  8. Is a 6" block back up wall suitable for 2 stories of a CMU cavity wall with around 4" of rigid insulation? Are there any special considerations?
  9. Personally, I do see numerous applications for the window/door surrounds that you describe...although typically they are installed as an anchored veneer along with the rest of the masonry veneer cladding. That said, there is nothing that would technically prevent an adhered veneer surround from being used - provided that it met current building code criteria...including the 15 pounds per square foot weight limit you reference. The challenge I foresee is whether such a product would be classified as a cast stone product (and accordingly meeting the requirements of ASTM C1364) or a manufactured stone veneer product (meeting the requirements of ASTM C1670). If intended to comply with ASTM C1364, establishing a mix design that met the compressive strength and absorption requirements of ASTM C1364 - while concurrently having a weight of 15 psf or less may be a challenge...but certainly possible.
  10. Very conditionally. In applications where the water will flow onto or impact the manufactured stone; I'd definitely recommend against such applications as the water will eventually erode the surface pigments...and eventually the stone. If, however, the manufactured stone is simply providing a backdrop to a waterfall without becoming wet due to the falling or splashing water, such applications may be acceptable. I would note that exterior waterfall applications such as this would require additional considerations to ensure the flowing water isn't diverted onto the surface of the stone by wind or other means.
  11. Can I install manufactured stone veneer in a waterfall application?
  12. For most practical uses in today’s construction there is no much difference. Both are blocks made out of cast concrete. Cinder blocks contain fly ash as an aggregate. That being said, most concrete contains fly ash in today’s construction of concrete masonry units.If anyone wants these type of blocks for construction contact Earth Pavers. It is one of India’s leading manufacturers of cement blocks, pavement and other building materials.
  13. As with any construction material/system, there are laboratory procedures and test methods that can simulate the effects of weathering and durability - but none can predict actual service life given the highly complex and varying exposure conditions systems and materials are exposed to. Instead, these tests are intended to provide a measure of relative performance under a given set of prescribed conditions. The only true measure of durability is in-service performance. Given that there are 1000's of concrete masonry structures that have been successfully performing for over 100 years in a wide array of environmental conditions, there is little better litmus. The key to longevity is: 1) using high quality materials, 2) good design practices; 3) proper construction techniques; and 4) appropriate maintenance over the lift of the structure.
  14. How can we measure the durability of Concrete Masonry, and what are the factors that contribute to the longevity of Concrete Masonry systems?
  15. Thanks, Craig Schriner for the information.
  16. I am a manufacturer of cast stone, I am interested in feed back on the prospects of designing a thin light weight cast stone trim for accents around doors and windows that would fit the pounds per square ft requirement to apply same the veneer stone is done? Too in the event the mix design cannot be made light enough because it becomes too thick for the sq ft area of contact, would there be a market for it if it were installed mechanically through the scratch coat? Bottom line is there a demand for the trim on the thin veneer?
  17. I'm often asked if it feasible to grout 4 inch (100 mm) concrete masonry units. To which I reply "No"...or possibly "Good Luck". While there is no code prohibition on grouting hollow 4 inch CMU, the size of the cells makes doing so pretty impractical - especially if reinforcement is present. The primary reason is illustrated in the accompanying photos showing a 4 inch CMU from the top of the unit (as made) and the same unit from the bottom (as made). While the width of the cells at the top of the unit could lead one to believe grouting is possible, due to the tamper of the cells opening width transitions from about 1.5 inches to around 0.75 inches. Is it impossible to fill these hollow 4 inch units with grout - no. But if a solid 4 inch unit is needed for whatever reason(s), it's easier, faster, and less expensive to simply specify a solid 4 inch unit.
  18. What is the difference between masonry grout and self-consolidating grout? Can I use self-consolidating grout in my project?
  19. What is the difference between high lift and low lift grouting, and which is best to use?
  20. What is the difference between a cinder block and a concrete block?
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