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What is Uniformity Requirements of Ready Mixed Concrete? (Mass Density of Mortar)

We have published many topics containing several parts. Here we do not defining the title of post by part-Nos (say part-1, 2, 3) rather we provided title with the subtopics related to uniformity requirements of Ready Mixed Concrete. Here in this post we will mainly learn about mass per unit volumes of air free mortar and rest terms to define uniformity tables. In the last post we have already discussed about coarse aggregate content.


The expression for mass per unit volumes of air free mortar determination is

expression for mass per unit volumes of air free mortar of concrete

Same expression can be used for both Inch-Pound and SI customary.


The explanations of the parameters used in expression are:


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M=This is our required term for which this expression is derived i.e. mass per unit volume of air free mortar. In in-lb unit, it is measured in lb/cubic feet and in SI unit, is measured by Kg/cubic meter.

b= As described in previous post, mass of fresh concrete sample measured by lb (in-lb) and kg (SI).

c= This term also discussed in previous post. In brief, this is saturated surface dry mass of aggregate that retained by 4.75 (No.4) sieve. This is also measured by lb or kg in respective unit system.

A= Air content in concrete measured in percent

G=SSD density of coarse aggregate

V=Volume of mass per unit volume container, measured by cubic feet or cubic meter.


The other terms used in these requirements are:

1. Average slump

2. Average compressive strength after 7 days for sample taken and other terms are self explanatory.


This is worth mentioning that mass per unit volume of air free mortar is determined by ‘variability test for concrete consistency’ as per designation 26, Bureau of Reclamation Concrete Manual (7th edition). Dear reader we will finish this post here but not this topic. In the very next post we will provide a table that provides requirements for uniformity using the term described in last post and this post. We are promising here that we will finish this topic in next post. You can navigate to all post with navigation table above. Dear viewer, for additional and uncut post we can visit our sister blog Structural, Concrete and Foundation Engineering. you are requested to bookmark this url. We will continue both site and promise to provide efficient and necessary information about structural, foundation, concrete and earthquake engineering.

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