無機聚合物與砂漿黏結特性之實驗與數值探討

Experimental and numerical investigation of adhesion between geopolymer and motar

朱秀雯(Hsiu-Wen Chu)

指導教授 ： 翁祖炘

國立臺北科技大學/工程學院/資源工程研究所/碩士(2009年)

摘要

由於複合材料的組成性質相異，其力學行為與界面黏結力學特性受到各組成材料界面黏結與界面傾角之影響。然材料界面黏結行為複雜，以致複合材料的力學行為常採等值連續體模式考量，忽略其微觀破壞模式與各向互制的特性。
本研究以無機聚合物黏結水泥砂漿所組成的複合材料試體為研究對象。首先進行一系列無機聚合物與水泥砂漿的單軸壓縮試驗，求得材料基本的應力－應變曲線與破壞模式。採用室內試驗與顆粒力學BPM模式探討複合材料界面黏結力學特性，並利用顆粒力學個別元素法進行數值模擬決定材料的微觀參數，分析材料受力反應與破壞模式，比對微觀尺度之力學機制在宏觀尺度下的力學行為，探討材料破壞後裂隙的生長、演化與影響其力學特性的因素，建立顆粒微觀參數與整體材料宏觀參數相互關聯性，決定無機聚合物與水泥砂漿的BPM模式微觀參數。繼而透過模擬含不同黏結界面角度試體單壓試驗的結果，探討破壞模式與應力應變關係，釐清界面黏結力學特性對整體行為之影響。經比較室內試驗結果顯示，BPM模式可有效模擬複合材料的力學特性，並提供描述界面黏結力學行為之參考。

關鍵字

個別元素法 ； 界面黏結力學特性 ； 微觀參數

並列摘要

Originating from different properties of constituted components, the mechanical behavior of a composite is influenced not only by its component parts but also by the adhesion of the interface between these parts and the attitude of the interface to loading direction. The mechanical properties of individual component can be determined by conventional laboratory tests. However, the mechanical parameters for interface of a composite are still difficult to be experimentally measured. While a representative equivalent volume model is employed to describe the mechanical behavior of composites, it cannot help but choose conservative parameters to avoid overestimation for limitedly unfavorable loading condition.
Focusing on a composite composed of geopolymer and mortar, this study carries out a series of laboratory- and numerical uniaxial compressive tests for its individual components to determine their representative parameters. The failure modes and stress-strain relationship are then well simulated by the bonded-particle model of particle flow code. Numerical experiments for composites with different attitudes of interfaces to the loading direction are performed to investigate the adhesive characteristics under various loading conditions. Results show that all the failure modes, i.e. the shear failure and tensile failure of individual components as well as their interface sliding can be simulated, and associated stress-strain curves fit well with those from the laboratory tests. Finally, the factors affecting the adhesive characteristics between geopolymer and mortar and associated mechanical behavior of an integrated composite are discussed and commented.

並列關鍵字

DEM ； adhesion ； micro-parameters ； Numerical experiments

參考文獻

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