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首页 > 过刊浏览>2024年第27卷第8期 >685-690. DOI:10.3969/j.issn.1007-9629.2024.08.003
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NO2-LDH对减水剂作用效果的影响及机理
作者:
作者单位:

西安建筑科技大学 材料科学与工程学院，陕西 西安 710055

作者简介:

井 雪（1999—），女，陕西渭南人，西安建筑科技大学硕士生. E-mail： 2668192124@qq.com

通讯作者:

宋学锋（1976—），男，河南周口人，西安建筑科技大学教授，博士生导师，博士. E-mail： songxuefeng-2008@163.com

中图分类号:

TB321

基金项目:

陕西省科研攻关项目（2018SF-367）


Influence and Mechanism of NO2-LDH on Effect of Superplasticizer
Author:
Affiliation:

School of Materials Science and Engineering， Xi’an University of Architecture and Technology， Xi’an 710055， China

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    摘要:

    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.

    Abstract:

    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.

    图1 CO3-LDH、CLDH和NO2-LDH的XRD图谱Fig.1 XRD patterns of CO3-LDH， CLDH and NO2-LDH
    图2 CO3-LDH、CLDH和NO2-LDH的FTIR图谱Fig.2 FTIR spectra of CO3-LDH， CLDH and NO2-LDH
    图3 NO2-LDH对掺聚羧酸系减水剂和萘系高效减水剂的净浆流动度影响Fig.3 Effect of NO2-LDH on slurry fluidity of polycarboxylic acid superplasticizer and naphthalene superplasticizer
    图4 NO2-LDH对掺聚羧酸系减水剂和萘系高效减水剂的砂浆抗折强度影响Fig.4 Effect of NO2-LDH on the bending strength of mortar mixed with polycarboxylic acid superplasticizer and naphthalene series superplasticizer
    图5 NO2-LDH对掺聚羧酸系减水剂和萘系高效减水剂的砂浆抗压强度影响Fig.5 Effect of NO2-LDH on compressive strength of mortar mixed with polycarboxylic acid superplasticizer and
    图6 聚羧酸系减水剂和萘系高效减水剂与NO2-LDH的离子交换性能Fig.6 Ion exchange properties of polycarboxylic acid superplasticizer and naphthalene superplasticizer with NO2-LDH
    图7 聚羧酸系减水剂、NO2-LDH、M1及M2的FTIR图谱Fig.7 FTIR spectra of polycarboxylic acid superplasticizer， NO2-LDH， M1 and M2
    图8 M1和M2的XRD图谱Fig.8 XRD patterns of M1 and M2
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井雪,宋学锋.NO2-LDH对减水剂作用效果的影响及机理[J].建筑材料学报,2024,27(8):685-690

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  • 收稿日期:2023-10-23
  • 最后修改日期:2024-01-09
  • 在线发布日期: 2024-09-03
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