混凝土导热系数试验与分析.pdf

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第13卷第1期
建筑材料学报
2010年2月
JOURNAL OF BUILDING MATERIALS
Feb.,2010
文章编号:3007-9629(2010)01-0017-05
混凝土导热系数试验与分析
肖建庄12,宋志文,张枫
(1.同济大学建筑工程系,上海20002;2.同济大学先进土木工程材料教育部重点实验室,上海200092)
摘要:为了研究基于现代施工工艺制成的混疑土导热系数,通过稳态平板导热仪对多种混凝土(包
括普通混凝土、高强混凝土、再生混凝土以及配筋混凝土)试件进行了导热系数试验,考察了包括骨
料体积分数、水灰比、骨料类型、外掺料掺量、温度、千湿状态及钢筋体积分数等因素对混凝土导热
系数的影响;进一步考察了再生粗骨料取代率对再生混凝土导热系数的影响,通过这些因素的显著
性分析,得到了各因素对混凝土导热系数影响的显著性大小依次为:干湿状态、再生粗骨料取代率
温度、骨料体积分数、骨料类型、钢筋体积分数、水灰比、掺和料种类
关键词:导热系数;再生粗骨料;显著性分析
中图分类号:TU528.01
文献标志码:A
doi:10.3969/j.issn.1007-9629.2010.01.004
An Experimental Study on Thermal Conductivity of Concrete
XIAO Jian-zhuangl, SONG Zhi-wen, ZHANG Feng
(1. Department of Building Engineering, Tongii University, Shanghai 200092, Chinag
2. Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai 200092, China
Abstract: In order to study thermal conductivity of concrete produced by modern construction technology
influencing factors on thermal conductivity of normal strength concrete, high performance concrete, recy
cled concrete as well as reinforced concrete were quantitativcly investigated by the stable plate thermal con-
ductivity meter. Seven testing variables, including the aggregate volume content, water-cement ratio(m/
m), types of aggregate, admixture content, temperature, moisture of specimen and reinforcement volume
content were considered in this test. With regard to recycled concrete, recycled aggregate replacement per
centage was also considered. These main influence factors on the thermal conductivity of concrete were i
vestigated by the outstanding analysis. The results show that the significance of these factors is as follows
from greatest to least: moisture, recycled coarse aggregate replacement ratio, temperature, volume frac
tions of aggregates, types of aggregate, volume ratios of reinforcement, m/m. and types of admixtures
Key words: thermal conductivity; recycled coarse aggregate; outstanding analysis
研究表明:骨料类型、孔隙率、于湿状态对混凝研究[6?,影响混凝土导热系数的主要因素有骨料的
土导热系数的影响最大的.文献[5]最早对混凝土矿物学特征和混凝土拌和物中的含水量
热工参数(包括导热系数)进行了系统的研究,它给
由于现代混凝土在水泥用量、外掺料(如大掺量
出了混凝土导热系数和比热容的计算方法.但是,这粉煤灰、磨细矿渣等)、骨料规格(粒径与压碎指标)
些方法本质上是纯经验的,计算中的自变量主要是与施工工艺(大流动性等)等方面与以前的混凝土存
混凝土配合比和骨料的岩石成分.根据国内的相关在较大差异,这勢必导致混凝土的热力学性能与以
收稿日期:2009-01-09;修订日期:2009-07-06
基金项目:上海市青年科技启明星计划(跟踪)项目(06QH14012);国家科技支撑计划项目(2008BAK48B03)
第一作者:肖建庄(1968-),男,山东沂南人,同济大学教授,博士生导师,博士.E-mail:jizx@tongji.edu.cn