文章信息/Info

Title:

Experimental Study and Orthogonal Analysis of Strength Size Effect of High Toughness Cementitious Composite

作者:

李雪陽1; 江世永2; 飛渭1; 姚未來1

后勤工程學院 1.軍事土木工程系;2.訓練部,重慶 401311)

Author(s):

LI Xue-yang1; J IANG Shi-yong2;  FEI Wei1;  YAO Wei-lai1

(1.Department of Military Civil Engineering; 2.Department of Training; Logistical Engineering University, Chongqing 401311, China)

關鍵詞:

尺寸效應; 高韌性水泥基復合材料; 配合比; 抗壓試驗; 正交分析

Keywords:

size effect;  high toughness cementitious composite;  mixture ratio;  compressive test;  orthogonal analysis

DOI:

10.7502/j.issn.1674-3962.2017.06.12

摘要:

尺寸效應是水泥基材料的固有特性，它與材料的配合比、強度以及結構組成等因素有關。高韌性水泥基復合材料是一種新型復合材料，具有優異的韌性，但同時其結構組成與普通混凝土相比也具有較大差異。然而，目前針對尺寸效應的研究大多限于普通混凝土和高強混凝土，并且尚無相關標準對高韌性水泥基復合材料尺寸效應的處理作出規范。為了探究該種復合材料的抗壓強度尺寸效應，本文采用兩種不同尺寸的立方體試件，對16組不同配合比的高韌性水泥基復合材料進行了單軸抗壓試驗和正交分析，研究了纖維摻量、水膠比、粉煤灰摻量和砂膠比這四個因素對材料強度尺寸效應的影響情況。試驗結果表明：與普通混凝土相比，高韌性水泥基復合材料的脆性特征明顯減小；諸因素對尺寸效應影響的主次順序為水膠比＞纖維摻量＞粉煤灰摻量＞砂膠比，其中水膠比和纖維摻量的影響均非常顯著，而砂膠比對尺寸效應影響甚微。

Abstract:

Size effect is the inherent characteristic of cementitious materials, which is related to the factors such as mixture ratio, strength and structure composition. The High toughness cementitious composite is a new type of composite material with excellent toughness, but at the same time the structure of it is quite different from that of ordinary concrete. However, most of the current studies on size effects are limited to ordinary concrete and high-strength concrete, and there is no relevant standard to regulate the size effect of high toughness cementitious composite. In order to explore the compressive strength size effect of high toughness cementitious composite, the uniaxial compressive tests and orthogonal analysis on 16 groups of high toughness cementitious composites with different ratios and two sizes of cube specimens were carried out to study the influence of four factors including fiber content, water-binder ratio, fly ash content and sand-binder ratio on the compressive strength size effect of this material. The test results show that the brittleness of high toughness cementitious composite is obviously reduced compared with ordinary concrete. The primary and secondary order of the influence of this four factors on size effect is water-binder ratio > fiber content > fly ash content > sand-binder ratio; the influence of water-binder ratio and fiber content is highly significant, while sand-binder ratio has little effect on the size effect