I am working on the optimization of 36 parameters experimentally. The optimization is dependent on compressive strength & flexural strength of concrete. In the mix design of concrete, I am playing only with Fine aggregates proportions. Rest of the quantities will not vary.
My question is can i cast mortar samples to get the idea of concrete results?
You will certainly have an idea about the optimal mortar mix. However, you will not get the compressive strength & flexural strength of the concrete tdirecty from those of the mortar.
You may refer book by Douglas C. Montgomery(20120 titled 'Design and Analysis of Experiments', Wiley publication for your work.
Try to justify why you want to cast mortar samples to get the idea of compressive and flexural strength of concrete?
It is a good advice from Bhavin to smartly plan the experiments. This provides more reliable results with fewer experiments than simply plan at random. Another good bok is that of Box, Hunter and Hunter; Statistics for Experimenters, an Introduction to Design, Data Analysis and Model Building John Wiley, 1978
I assume that the reason is that experiments on mortar are simpler and cheaper (smaller samples) than experiments on full concrete.
Any change in the composition of the mixture affects the remaining amounts of the ingredients. The condition of the volume, the amount of ingredients in the unit of the mixture is important.
The change in the amount of fine aggregate affects the mortar change, consumption of cement, water and admixtures. So everything changes.
Concrete is an extremely complex composite whose properties are influenced by everything, its components, their quantity, and environmental conditions.
The properties of concrete are influenced not only by the type and quantity of ingredients, but also by the technology of production, care, research methodology, and environmental conditions.
I agree with Waldemar Łasica. Defining only the amount of fine aggregate as a parameter that will influence the mechanical properties you are evaluating is insufficient. However, there are indeed effects caused by changing the amount of fine aggregate in concretes and mortars. For example, by increasing the amount of fine aggregate, the mortar content of the concrete will increase and so will the amount of water required to achieve a given consistency (concretes and mortars). Consequently, by increasing the amount of water, the mechanical resistance will decrease. Anyway, there are many factors and I fully agree with the previous comments of colleagues.
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