Influence and Mechanism of NO2-LDH on Effect of Superplasticizer
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.
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