Research on the Influence of Fluctuation of Flocculant Content in Mechanism Sand on Concrete Performance

This article selects anionic polyacrylamide (PAM, molecular weight 2×10⁷ Da), commonly used in the mechanism sand industry as a flocculant, and investigates the effect of the fluctuation of flocculant content in mechanism sand on the performance of different strength grades of concrete. The results show that, under the condition of keeping the concrete mix ratio constant, the flocculant content increases from 0 ‰ to 0.03 ‰, and the slump and expansion of the concrete at the time of discharge decrease, resulting in a deterioration of the workability of the concrete. When the content of flocculant decreases from 0.03 ‰ to 0 ‰, concrete experiences segregation and bleeding problems; and the bleeding rate of C30 concrete is higher than that of C50, which degrades the uniformity of concrete and leads to substandard compressive strength.