采用焙烧还原法制备了亚硝酸根插层水滑石（NO₂-LDH），并研究了其对减水剂吸附分散及增强效果的影响.结果表明：NO₂-LDH的层间距和结晶度较原碳酸根型镁铝水滑石均略有降低；NO₂-LDH与减水剂之间存在阴离子交换，降低了减水剂的吸附分散效果，且减水剂分散效果的降低程度随着NO₂-LDH掺量的增加而增大；NO₂-LDH对掺减水剂砂浆抗折强度的影响不明显，对抗压强度略有提升；NO₂-LDH对萘系高效减水剂分散效果的影响大于对聚羧酸系减水剂的影响.

Nitrite intercalation hydrotalcite（NO₂-LDH） was prepared by roasting and reduction method， and its effect on adsorption， dispersion and enhancement of superplasticizer were studied. The results show that the layer spacing and crystallinity of the NO₂-LDH are slightly lower than that of protocarbonate type Mg-Al hydrotalcite. There is anion exchange between NO₂-LDH and superplasticizer， which reduces the adsorption and dispersion effect of superplasticizer. The decreasing degree of dispersion effect of superplasticizer increases with the increase of NO₂-LDH content. NO₂-LDH has no obvious effect on the flexural strength of mortar mixed with superplasticizer， but the compressive strength is slightly increased. The effect of NO₂-LDH on the dispersion of naphthalene superplasticizer is greater than that of polycarboxylic acid superplasticizer.

TB321

陕西省科研攻关项目（2018SF-367）