期刊
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
卷 145, 期 2, 页码 -出版社
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)GT.1943-5606.0002008
关键词
Kaolinite; Fly ash; Polymers; Biopolymers; Fabric; Critical state; Shear strength; Friction angle; Polymer bridging; Charge
资金
- National Natural Science Foundation of China [51779219]
- One-Thousand-Young-Talents Program of the Organization Department of the CPC Central Committee
Polymers have gained gradual attention in soil stabilization as a sustainable alternative to inorganic counterparts such as cement. However, the effects of polymers on the strength of soils and soil-waste mixtures are still unclear. Meanwhile, waste recycling has been important in fostering a sustainable environment in recent decades. To solve the deficiency in knowledge, large-strain strength of polymer-modified kaolinite (KA) and Class-F fly ash-kaolinite mixtures (FAKAs) was investigated with isotropically consolidated undrained triaxial compression tests. Both synthetic polymer (polyethylene oxide, PEO) and naturally occurring biopolymers (chitosan and xanthan gum) were used. An interface model was also proposed to account for interfaces of KA, FAKA, and fly ash. Experimental results suggested that (1)polymers induce preexisting fabrics to render dilative behavior to KA and FAKA; (2)normal consolidation lines (NCLs) and critical state lines (CSLs) for polymer-modified KA were nearly parallel to each other, while the CSLs were steeper than NCLs for polymer-modified FAKA, possibly due to kaolinite filling the voids of crushed fly ash cenospheres; (3)the critical state friction angle (phi cs) of kaolinite increased from 19.7 degrees to 24.1 degrees and 22.3 degrees with the addition of PEO and chitosan via mechanisms of polymer bridging and charge neutralization, respectively; xanthan gum decreased the phi cs of kaolinite to 19.1 degrees via Coulombic repulsion; and (4)the just mentioned mechanisms held for polymer-modified FAKA to a lesser extent due to other complicated interactions, such as polymer crosslinking or entanglement and ion-dipole interactions.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据