The water reducer in concrete additives has been developed for many years. From the original lignosulfuric acid series, to the naphthalene series, and then to the current polycarboxylic acid series. Until now, naphthalene series and polycarboxylic acid series are more commonly used, but polycarboxylic acid series are gradually replacing naphthalene series
The water-reducing rate of polycarboxylate superplasticizer is significantly higher than that of naphthalene-based water-reducing agent. When the same water-reducing rate is reached, the amount of polycarboxylate superplasticizer is much lower than that of naphthalene-based water-reducing agent.
Compared with naphthalene series, polycarboxylic acid series have the following advantages
The polycarboxylate water-reducing agent is obviously superior to the naphthalene-based water-reducing agent, and the large-flow concrete prepared with the polycarboxylic acid water-reducing agent can still reach the pumping requirement after 1h;
With the increase of the dosage, the limit water reduction rate of the polycarboxylate superplasticizer is much higher than that of the naphthalene series, and the naphthalene type water reducing agent dosage is 2. When the O% is about to reach the limit, it indicates that the polycarboxylate water reducing agent is more suitable for formulating low water-cement ratio high-strength concrete. Moreover, the polycarboxylic acid water reducing agent is non-toxic, non-corrosive, and has no pollution to the environment.
Polycarboxylate water reducing agent is a new generation of water reducing agent than naphthalene water reducing agent. With the advancement of technology, polycarboxylate water reducer is gradually replacing the old generation of naphthalene water reducer with its advantages.