Research On Design Of The Concrete Proportion Considering Aggregate Gradation And The Density

The most important composing material of concrete is aggregates, while whose gradation make an important effect on the workability, durability and mechanicals properties of concrete and the economy of concrete. Lots of scholars have been dedicating themselves enthusiasm for this field and have attained some achievements, however in this field, there is certain study still to be opened to objection.Aggregates gradation is confirmed by sand ratio according the standard of country during the practical process producing concrete, which it is lack of definite quantity and is calculated by non-computerization. This paper centers on aggregates gradation to carry out following works that:(1) According to the theory on compact mix proportion design of concrete, analyze the impact of aggregates gradation and density of concrete on the properties of concrete. (2) Analyze the impact of aggregates gradation on density of concrete, and, basing on those, present the fitting curve on the concrete's aggregation gradation, (3) Study the computing methods, which calculate materials content of percentage in every particle size, around fitting the curve on the maximum density aggregates gradation. (4) Carry out experiments about the aggregates and mechanicals properties of concrete. (5) Study and analyze the results of experiments, while taking out design method about concrete mix proportion design. We attain following results that:(1) Find the method of fitting the maximum density gradation of aggregation.(2) Achieve using the program soft MATLAB and Excel to calculate the content of aggregate in particle sizes.(3) Though experiments, prove that we can obtain the maximum density of aggregation form adopting the Talbol curve of gradation.(4) Put forward the design method on compact mix proportion design of normal concrete gradation basing on the Talbol curve of gradation.(5) The concrete strength testing indicate:The strength of concrete isn't reach the maximum value under the maximal packing density, while according the just proportions of stone and sand, is able to reach the maximum strength of concrete.