The Structure and Properties of Sulfo-Butylated Celluluse Ether (SBC) Based Water-Reducing Agents

Abstract

Abandoned cellulose was treated with acid to prepare Micro-Crystalline Cellulose (MCC) holding affirmative polymerization, which was then treated with 1,4–butanesultone (BS) to synthesize water-soluble Sulfo-Butylated Cellulose ether (SBC). The structure of the SBC was characterized by means of FT-IR, 1H NMR, SEM, and XRD, and its relationship to function was investigated based on the polymerization of MCC and Degree of Substitution (DS). SEM images of hardened cement were also studied. The results indicated that when the polymerization of the MCC was smaller than 96 and the DS greater than 0.375, SBC exhibited water-reduction. When sulfonated cellulose was mixed into the cement paste, its retarding effect slowed hydration early in the aging process, so that later the structure of hardened cement paste became more uniform and compact than that of control.

Production of bio‐based concrete water reducers from renewable resources: a review

“…There has recently been growing interest in the development of chemically modified polysaccharides as high‐range water reducing admixtures 110 . Numerous investigations have been reported to modify polysaccharides such as starch and pure cellulose for concrete water reducers 6,36,39,57,117–121 . Tegiacchi and Casu 117 found that superplasticizers with superior properties could be produced by sulfonating polysaccharides with suitable sulfonating agents.…”

“…This work also demonstrated that starch maleate and starch‐sulfobutyl could be potential substitutes for casein as self‐leveling compounds for concrete. Maimaiti and Aerken 57 investigated the structure and properties of sulfo‐butylated cellulose (SBC) ether for use as water reducing agents in cement paste and concrete. The water‐soluble SBC ether was synthesized by reacting micro‐crystalline cellulose (MCC) and 1,4‐butanesultone (BS) and the product structure was characterized by FTIR, 1H NMR, scanning electron microscopy (SEM) and X‐ray diffraction (XRD).…”

“…However, most synthetic water reducers can function as superplasticizer and accelerate the setting time of concrete. 57…”

“…110 Numerous investigations have been reported to modify polysaccharides such as starch and pure cellulose for concrete water reducers. 6,36,39,57,[117][118][119][120][121] Tegiacchi and Casu 117 found that superplasticizers with superior properties could be produced by sulfonating polysaccharides with suitable sulfonating agents. They reported that sulfonating polysaccharides such as starch, cellulose, and hemicellulose with cholorethane sulfonic acid and chloropropane sulfonic acid at a minimum degree of sulfonation of 0.2 could improve cement fluidity.…”

“…They act by reducing the rate of hydration of the cement in concrete thereby increasing the setting time. However, most synthetic water reducers can function as superplasticizer and accelerate the setting time of concrete 57 …”