No abstract

DRUGG-Digitalni repozitorij UL FGG http://drugg.fgg.uni-lj.si/ Ta članek je avtorjeva zadnja recenzirana različica, kot je bila sprejeta po opravljeni recenziji. Prosimo, da se pri navajanju sklicujete na bibliografske podatke, kot je navedeno:

In the paper a new setup for measuring setting and hardening process of cementitious materials, using a non-destructive ultrasonic shear wave reflection technique and designed with the objective to be easily used in-situ, is described. Using the developed setup, the measurements can be performed by slight deepening of a measuring head into a paste in a mold or by placing the paste into a mold fixed on a measuring head. To test the proposed methodology, cement pastes with different compositions were prepared and exposed to different curing temperatures. Significant differences in the evolution of a change of a shear wave reflection coefficient Δr in time were observed, indicating ability of the method to monitor setting process of cement pastes. Moreover, some interesting phenomena in the solidification process of the materials can be identified. A linear relationship between development of the Δr and penetration resistance d P values in time was found, allowing development of a simplified procedure to determine both initial and final setting times of the material.

No abstract