Adding water reducing agents to sulfur deficient cement usually results in poor fluidity, and increasing the dosage of water reducing agents may have certain effects, but it will also increase the bleeding of concrete. The prepared concrete has poor uniformity and fast slump loss, so commonly used water reducing agents are difficult to adapt to, and even doubling the dosage of retarders has no effect.
It is not difficult to see that the fundamental reason for the above-mentioned maladaptive phenomenon in sulfur deficient cement is due to insufficient SO3 in the cement, which reduces the hydration effect of C3A in the cement. The rapid and large adsorption of C3A on external additives also reduces the plasticizing function of the water reducing agent. Therefore, only supplementing soluble alkali (sulfate) is effective in solving the adaptability problem of low alkali and sulfur deficient cement. The commonly used method of increasing the dosage of retarders is not effective.