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Abstract
The physical structure of cement is of pivotal importance in the study of volumetric stability and cracking of concrete. While most of efforts in the category of crack mitigation of concrete have been devoted to the incorporation of sophisticated chemical admixtures into concrete mixtures, less attention has been paid to the fact that the modification of cement structure can be considered as a sustainable solution to this problem. This study aims to investigate the effect of the modification of the physical structure of cement on workability, early-age strength and autogenous shrinkage of cement pastes. The results show that the modification of cement physical structure can be used as a sustainable route to reduce shrinkage of cementitious materials.
Highlights
Concrete is by far, the most widely-used construction material on our planet
In spite of the fact that the addition chemical admixtures can help to alleviate cracking in concrete, less attention has been paid to the physical structure of cement as a measure to control both hydration kinetics and pore structure in order to prevent tensile stresses induced by cement hydration just from the beginning
It should be noted that increasing the fineness of cement particles to the values smaller than 1 μm, leads to higher inter-particulate adhesive forces which can lead to agglomeration [16]
Summary
The most widely-used construction material on our planet. This high consumption rate has led to a significant demand for cement since it constitutes almost one-third of the volume of concrete. Realizing and modifying multi-scale processes resulting in shrinkage of concrete can be a crucial step toward improving this shortcoming. This approach has received great attention in recent years. Extensive multi-phase studies have been done on shrinkage reducing admixtures (SRA) such as monoalcohols [1], [2], glycols [2]–[6], polyoxyalkylene glycol alkyl ethers [7], or other nonionic surfactant structures [8] to control capillary pressure within pores and decrease the volume change in concrete. The physical structure of cement is of pivotal importance in the study of volume-change and cracking of concrete and is controlled by final grinding [15]. It should be noted that increasing the fineness of cement particles to the values smaller than 1 μm, leads to higher inter-particulate adhesive forces which can lead to agglomeration [16]
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