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Continue Reading » A simple method of concrete mix design for pumpable concrete based on an estimated weight of the concrete per unit volume is described in the paper.
The tables and figures presented are worked out by the author from a wide range of Indian materials.
The method is suitable for normal weight concrete with admixture.
INTRODUCTION Pumped concrete may be defined as concrete that is conveyed by pressure through either rigid pipe or flexible hose and discharged directly into the desired area.
For all major projects, flexural strength of the mix shall be determine by third point loading of flexural beams size 150 mm x 150 mm x 700 mm as per IS: 516.
Determination of flexural strength by correlating with cube strength (compressive strength) shall not be allowed for major projects, as the correlation is not well established.
By the time cube strength results indicate low strength, it is too late to do any remedy for the defective concrete which has already set in the form, Further in whole day of concreting work, cubes are filled from only a few batches of concrete which do not actually represent the strength of the entire concrete mass being used in the construction.
This shows the limitations of cube strength test for the quality control of concrete.