Physical Characterization of Cementitious Materials on Casting and Placing Process

Materials

Hong Jae Yim¹ 

[1] Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea; E-Mail:

关键词: cement paste;    particle size;    coagulation;    flocculation;    laser backscattering;   

DOI  :  10.3390/ma7043049

来源: mdpi

【 摘 要 】

Coagulation of cement particles is an inevitable phenomenon of fresh cement-based materials undergoing solidification. Coagulation can be classified into two types, reversible flocculation and irreversible coagulation, wherein microstructural change affects the rheological properties, including shear thinning and thixotropy, and the hydration process. This paper attempts to measure the mechanical property and the coagulation of cement particles according to the mix proportions of cement paste. Experimental setups were proposed for two different types of coagulations using a laser backscattering instrument. Volume fraction and size distribution of coagulated particles were obtained, and their variations were discussed. From the obtained results the microstructural buildup of freshly mixed cement pastes can be divided into three categories: permanent coagulation and strong and weak flocculation.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland