Journal of Concrete Structures and Materials

Journal of Concrete Structures and Materials

Investigating the Effect of Cement Grading on the Characteristics of Concrete and Ctandard Mortar

Document Type : Original Article

Authors
Ali Akbar Kafash Bazari 1
Mohamad Vatani 2
Zivar Nikfal 3
1 Chief of Laboratory of research and development of Tehran cement Co
2 Expert of Laboratory of Tehran cement Co, Tehran, Iran
3 Chief of Laboratory of physic of Tehran cement Co
10.30478/jcsm.2023.368826.1298
Abstract
Grading is one of the most important characteristics of cement, which has a great impact on its performance in fresh and hardened concrete. The most common methods of cement grading monitoring are determination of residue through 200, 90 and 45 micron sieves, fineness test by Blaine method and Laser Grading. Combining the results of these tests is the best way to control cement grading. In this study, it was tried to introduce the main indices of cement grading and its effect and suitale ranges. Therefore, through a laboratory operation, 204 samples of type 2 Portland cement were prepared and their physical characteristics were determined and laser grading was done. Then, by making concrete mixtures with constant workability (slump 8±0.5 cm), the performance of cement samples with various grading in concrete mixtures was investigated. Among the most important results in this extensive study, the clear effect of increasing the amount of 3-30 micron particles and the uniformity coefficient of cement on the compressive strength of concrete and mortar and the presenting of the relationships can be mentioned.The compressive strength of 28-day standard mortar is approximately equal to half of the amount of 3-30 micron particles and constant value o 22 MPa.
Keywords
Grading
PSD
Cement
Mortar
Concrete

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  • Receive Date 07 November 2022
  • Revise Date 09 May 2023
  • Accept Date 01 November 2023