Portland cement hydration and early setting of cement stone intended for efficient paving materials

Energy Management of Municipal Transportation Facilities and Transport - EMMFT 2017

Grishina, A.^1

Moscow State University of Civil Engineering, Nanomaterials and Nanotechnology Research and Educational Center, Yaroslavskoye hw. 26, Moscow

129337, Russia^1

关键词: Cement hydration;    Degree of hydration;    Hydration process;    Hydration products;    Induction periods;    Portland cement concretes;    Transportation engineering;    Tricalcium silicate;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/90/1/012006/pdf
DOI  :  10.1088/1755-1315/90/1/012006

来源: IOP

【 摘 要 】

Due to the growth of load on automotive roads, modern transportation engineering is in need of efficient paving materials. Runways and most advanced highways require Portland cement concretes. This makes important the studies directed to improvement of binders for such concretes. In the present work some peculiarities of the process of Portland cement hydration and early setting of cement stone with barium hydrosilicate sol were examined. It was found that the admixture of said sol leads to a shift in the induction period to later times without significant change in its duration. The admixture of a modifier with nanoscale barium hydrosilicates increases the degree of hydration of the cement clinker minerals and changes the phase composition of the hydration products; in particular, the content of portlandite and tricalcium silicate decreases, while the amount of ettringite increases. Changes in the hydration processes of Portland cement and early setting of cement stone that are caused by the nanoscale barium hydrosilicates, allow to forecast positive technological effects both at the stage of manufacturing and at the stage of operation. In particular, the formwork age can be reduced, turnover of molds can be increased, formation of secondary ettringite and corrosion of the first type can be eliminated.