File:Cement houses and how to build them. (1908) (14596345760).jpg

Identifier: CementHousesAndHowToBuildThem (find matches)
Title: Cement houses and how to build them.
Year: 1908 (1900s)
Authors: William A. Radford
Subjects: house plans -- catalogs domestic architecture cement houses concrete houses
Publisher: Radford Architectural Company
Contributing Library: MBJ collection

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from 300 to 71 per cent, of the strength of the 1 to 4 500 tests. mortar, and but 50 per cent of the strength Tensile strength in lbs. per square inch of a 1 to 3 mortar. The 1 to 4 mortar has of Portland Cement. but 70 per cent, of the strength of a 1 to 3 Proportions 7 28 2 3 4 6 12 mortar and 46 per cent, of the strength of days. days. mos. mos. mos. mos. mos. a 1 to 2 mortar. Neat cement 710 768 760 740 732 758 768 mu ^44! e • ru 1 to 1 mortar 590 692 690 680 680 685 695 ihe ratl° °f compressive strength to 1 to 2 mortar 370 458 460 455 453 458 460 tensile strength is not quite constant for 1 to 3 mortar 208 300 310 310 310 310 308 ,i . -, « ,. 1 - ., , l to 4 mortar 130 210 230 230 230 232 232 a11 periods ot time, and for the several l to 5 mortar 80 150 185 195 195 195 197 mixtures above given; but the compressive It must also be kept in mind that these strength, or resistance to crushing per results are obtained under practically uni- square inch, may be approximately ob-
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-TOeT/Mu Eelvation op Cement Porc^ Fig. 7—This illustration shows the arrangement of concrete blocks in connection with a concrete porch and stepsi CEMENT HOUSES AND HOW TO BUILD THEM. 25 tained by multiplying the tensile strengthgiven in the above table by the constant six(6). (Note. This would increase with theage of the mortar, and would be greaterfor good gravel or stone concrete than forthe clear mortar of which a given concreteis made.) In fixing the minimum time required forcuring and aging blocks before use, dueregard should be given to the proportionsused. It is manifestly wrong in principleto require as long a period for a 1 to 2 ora 1 to 3 block as might seem necessary fora 1 to 4 or a 1 to 5 block, and it is obviouslyunsafe to attempt to use a block of lean posed upon blocks for minor and lessimportant uses. Marking. All cement blocks should bestamped (in process of making), showingname of manufacturer, date (day, monthand year) made, and composition or pro-portions used

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