C4A3S对氨基磺酸盐高效减水剂的吸附研究

实验室制备了无水硫铝酸钙（C4A2S）单矿物，采用紫外-可见吸收光谱法测定氨基磺酸盐高效减水剂（简称“AS减水剂”）在C4A3S单矿物及其混合料（C4A3S＋Ca（OH）：＋CaSO4·2H2O）矿物颗粒表面的吸附量，对AS减水剂在水化体系矿物颗粒表面的吸附行为进行了研究。结果表明：C4A3S单矿物和水化混合料对As减水剂的吸附量随初始浓度的增大而增大；对As减水剂的吸附量与极限吸附量随水化时间的延长而增大；在相同吸附时间内，AS减水剂在C4A3S混合料水化体系的吸附量与极限吸附量大于在C4A3S单矿物水化体系的吸附量与极限吸附量。

Study on adsorptive behaviors of aminosulfonic acid-based superplasticizer on calcium sulphoaluminate mineral

Calcium sulphoaluminate （3CaO. 3AhO3·CaSO4, C4A3S） was synthesized with pure chemical reagents. The adsorbed amount of aminosulfonic acid-based superplasticizer （AS） on the surface of C4A3S mineral and the mineral mixture （ C4A3S ＋Ca（OH） 2＋CASO4~ 2H20） were detected by ultraviolet-visible absorption spectrometry. The adsorptive behaviors of AS on the surface of mineral particles in the hydration system were studied. The results showed as follows： the adsorbed amount of AS on C4A3S mineral and the mineral mixture increased with climbing initial concentration; the adsorbed amount and the maximum absorption amount increased with hydration time prolonged; the adsorbed amount and the maximum absorption amount of AS on the mineral mixture was more than those on the C4A3S mineral in the hydration system within the same hydration time.