粉煤灰中铵离子含量对混凝土减水剂掺量及吸附特性影响

研究了粉煤灰中铵离子含量对新拌混凝土流动性、混凝土中减水剂掺量及混凝土性能的影响，并采用TOC实验分析了粉煤灰铵离子含量对减水剂吸附量影响。结果表明:随着粉煤灰中铵离子含量的增加，新拌混凝土流动性逐渐降低；混凝土达到相近流动性时，随着粉煤灰中铵离子含量增加，混凝土中减水剂的掺量逐渐增大，混凝土强度均逐渐降低；TOC实验表明粉煤灰中铵离子含量越高对减水剂的饱和吸附量越大。 

Effect of Ammonium Ion Content on Superplasticizer Dosage and Adsorption Property

Effects of ammonium ion content in fly ash on the fluidity of fresh concrete, the superplasticizer dosage in concrete and the properties of concrete were studied, and the effect of adsorption on superplasticizer was analyzed by TOC test. Results show that as the content of ammonium ion in fly ash increases, the fluidity of fresh concrete decreases. When maintaining the close fluidity, as the content of ammonium ion in fly ash increases, the superplasticizer dosage in concrete increases, and the strength of concrete decreases. TOC test shows that the higher content of ammonium ion is, the greater adsorption of superplasticizer will be.