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ENCN221-25S1 - Engineering Materials
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Use the information supplied from Appendix B of the masonry code (NZS 4230) to determine the characteristic masonry compressive strength given i) the concrete masonry unit has a void equal to half the gross area, the mean compressive strength of the unit = 20 MPa with a standard deviation of 2 MPa, ii) the grout has a mean compressive strength of 23 MPa with a standard deviation of 3 MPa?
fm = 0.59 α f
xm = √(0.35 α2 x
fm’ = fm – 1.65 x
Which of the following statements about masonry construction are correct?
Which mix should have the lowest permeability
Material Mix A Mix B Mix C Cement (GP) 380 349 210 Micro Silica/Silica Fume 0 31 0 Fly Ash 0 0 90 Water 160 160 180 Sand 800 800 860 Stone 1000 1000 1000 W/C 0.42 0.42 0.6
Which mix (or mixes) satisfies the requirements for class C marine exposure
Material Mix A Mix B Mix C Cement (GP) 380 349 210 Micro Silica/Silica Fume 0 31 0 Fly Ash 0 0 90 Water 160 160 180 Sand 800 800 860 Stone 1000 1000 1000 W/C 0.42 0.42 0.6
Which of the following statements is correct about the use of fly ash?
What can be done to lower the permeability of concrete?
Why should the amount of water used to make concrete be kept low (assume the w/c ratio remains unchanged)?
What are the effects of insufficient compaction?
What are the main hydrations products in the reaction between Portland cement and water?
Which factors will result in a lower water demand?