CIVENG 3J04 Lecture Notes - De-Ice, Trail Mix, Fineness
6 Jun 2013
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Document Summary
The purpose of mix design is to determine the proportion of the various ingredients of concrete. The basic ingredients are cement, water, coarse and fine aggregates and air. Concrete mixes are produced to satisfy specified requirements of: workability, strength, durability and economy. The mix design procedure described herein results in a trail mix, which may need further modifications/adjustments in the proportions of the ingredients in order to meet the specifications. A basic mix design involves the following steps: Step1: decide on the required slump (a workability requirement) Table 1: recommended slump for various types of concrete. * based on experience, or select from table 1. Step 2: selection of maximum aggregate size (dmax) * choose the maximum allowable size; it reduces the total void space, and requires less mortar per unit volume of concrete. Here are some limitations: dmax dmax dmax (narrowest dimension of members) / 5 (depth of slab) / 3.
