A treatise on concrete, plain and reinforced : materials, construction, and design of concrete and reinforced concrete; 2nd ed. . equired to produce thiscurve will show the relative quantity of each which must be used in pro-portioning. The theory of the combination and comolete discussion of the PROPORTIONING CONCRETE 207 methods to be employed with dififerent forms of curves are treated inAppendix IV. A less exact method, but one which is convenient in practice, is by inspec-tion and trial of different percentages. To illustrate this trial plan, themethod of forming a curve of a mixture of s
A treatise on concrete, plain and reinforced : materials, construction, and design of concrete and reinforced concrete; 2nd ed. . equired to produce thiscurve will show the relative quantity of each which must be used in pro-portioning. The theory of the combination and comolete discussion of the PROPORTIONING CONCRETE 207 methods to be employed with dififerent forms of curves are treated inAppendix IV. A less exact method, but one which is convenient in practice, is by inspec-tion and trial of different percentages. To illustrate this trial plan, themethod of forming a curve of a mixture of several materials in stated pro-portions such as I : 2 : 4 will be given, then the curve for the mixture of thesame materials which corresponds nearest to the curve of maximum density,and finally the application will be made to material like run of the bankgravel which may be separated into two or three parts. In reading this discussion it must be borne in mind that the same prin-ciples will apply to mixtures of several aggregates, although for simplicitythe principal part of the discussion refers to two aggregates. The same. DIAMETERS OF PARTICLES IN INCHES F^o- 73-—Curves of Fine and Coarse Crushed Stone and Mixtures, () approximate plan may be used for the larger number of aggregates or themore exact method in the Appendix may be adopted. Plotting Curve of Mix in Studying Proportions. In Ylg. 73 we havef-inch Shawangunk grit as one aggregate and the same material rolled to^-inch maximum size as the other, giving the mechanical analysis curvesshown in the diagram.* In this diagram a curve of cement is also plotted so that the 1:2:4curve represents the combination of the three materials. The curve markedI : 2 : 4. then represents the analysis of the mixture of cement, screenings . * This diagram and the ones which follow are made up from materials used in subsequent studiesby the New York Board of
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