The relationship between cellulose nanocrystal dispersion and strength

被引：143

作者：

Cao, Yizheng ^{[1
]}

Zavattieri, Pablo ^{[2
]}

Youngblood, Jeffrey ^{[1
]}

Moon, Robert ^{[3
]}

Weiss, Jason ^{[4
]}

机构：

[1] Purdue Univ, Sch Mat Engn, W Lafayette, IN 47907 USA

[2] Purdue Univ, Lyles Sch Civil Engn, W Lafayette, IN 47907 USA

[3] US Forest Serv, Forest Prod Lab, Madison, WI 53726 USA

[4] Oregon State Univ, Sch Civil & Construct Engn, Corvallis, OR 97331 USA

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2016年 / 119卷

基金：

美国国家科学基金会;

关键词：

Cellulose nanocrystal; Agglomeration; Ultrasonication; Flexural strength; Short circuit diffusion; PERCOLATION-THRESHOLD; CARBON; AGGLOMERATION; PERFORMANCE; PHASES; FIBER;

D O I：

10.1016/j.conbuildmat.2016.03.077

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This paper studies the agglomeration of cellulose nanocrystals (CNCs) and uses ultrasonication to disperse CNCs in cement pastes in an attempt to improve strength. Rheological measurements show that when the concentration of CNCs exceeds 1.35% by volume in deionized water, agglomerates start to develop. This experimental finding is comparable to the value obtained from a geometrical percolation model (1.38% by volume). When the matrix phase (deionized water) is replaced with a simulated cement paste pore solution, the CNCs begin to agglomerate at a lower concentration (approximately 0.18% by volume). The CNC concentration of 0.18% corresponds to the concentration of CNCs in cement paste where the maximum strength is reached. Tip ultrasonication was found to effectively disperse the CNCs and the cement pastes obtained strength improvements of up to 50%, which is significantly better than the strength improvement of raw CNCs alone (20-30%). (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：71 / 79

页数：9

共 41 条

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