Research on the influence of mud content of machine-made sand on concrete bubble parameters.

By controlling the mud content of manufactured sand to 0-10%, the effects of the mud content of manufactured sand on the air content of ready-mixed concrete, the loss rate of air content over time, the bubble spacing coefficient and the distribution of pores on the hardened appearance were studied by using the concrete air content meter and the bubble parameter analysis system. The results show that: when the mud content of the manufactured sand is lower than 6%, the air content of concrete and the loss rate over time increase with the increase of the mud content of the sand; when the mud content is higher than 6%, the air content and loss rate of concrete show a downward trend with the increase of the mud content of the sand. When the mud content of manufactured sand is lower than 4%, the concrete bubble spacing coefficient decreases with the increase of mud content of sand, and the number of pores on the appearance of hardened concrete increases with the increase of mud content. When the mud content is higher than 4%, the bubble spacing coefficient of the concrete increases with the increase of the mud content of the sand, and the number of pores on the hardened appearance of concrete decreases with the increase of mud content. [ABSTRACT FROM AUTHOR]