木质素磺酸钠与聚羧酸减水剂复配研究

doi:10.3969/j.issn.0253-2417.2016.04.006

Abstract

Abstract: Sodium lignosulfonate (SLS) was obtained by oxidation and sulfomethylation from pulp black liquor, and the sulfonation degree and weight-average molecular weight (M_w) were 1.023 7 mmol/L and 26 320, respectively. A series of complex superplasticizers(BPCE1,BPCE2,BPCE3 and BPCE4) were prepared by blending SLS and polycarboxylate superplasticizer (PCE) with various ratio. The adsorption layer thickness on cement particle surface and slurry Zeta potential of complex superplasticizer were studied. The results showed that the thickness increased with the SLS content increase. The Zeta potential of slurry showed the greatest absolute value when the mass fraction of SLS was 20%. The cement and concrete was prepared with the complex superplasticizer dosage 0.18% and SLS 1% of the total dosage. The research results of paste fluidity, mortar fluidity, bleeding rate, the water reducing ratio and compressive strength of concrete showed that the optimal performance was realized as the 20% SLS was used in the complex superplasticizer BPCE2.

Key words: black liquor, modification, polycarboxylate, blending

CLC Number:

TQ35

WANG Jin-zhi, WANG Wen-jun, HE Ming, LI Ben-gang, ZHU Li-jun, LUO Zhen-yang. Sodium Ligninsulfonate and Its Blendings with Polycarboxylic Superplasticizer[J]. Chemistry and Industry of Forest Products, 2016, 36(4): 41-48.

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Sodium Ligninsulfonate and Its Blendings with Polycarboxylic Superplasticizer

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