[1]邱继生,杨占鲁,关 虓,等.煤矸石陶粒混凝土微观孔结构特征及抗压强度[J].西安科技大学学报,2020,(01):110-117.
 QIU Ji-sheng,YANG Zhan-lu,GUAN Xiao,et al.Microscopic pore structure and compressive strength of coal gangue ceramsite concrete[J].Journal of Xi'an University of Science and Technology,2020,(01):110-117.
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煤矸石陶粒混凝土微观孔结构特征及抗压强度(/HTML)
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西安科技大学学报[ISSN:1672-9315/CN:61-1434/N]

卷:
期数:
2020年01期
页码:
110-117
栏目:
出版日期:
2020-02-15

文章信息/Info

Title:
Microscopic pore structure and compressive strength of coal gangue ceramsite concrete
文章编号:
1672-9315(2020)01-0110-08
作者:
邱继生杨占鲁关 虓邢 敏张程华秦 卿
(西安科技大学 建筑与土木工程学院,陕西 西安 710054)
Author(s):
QIU Ji-shengYANG Zhan-luGUAN XiaoXING MinZHANG Cheng-huaQIN Qing
(College of Civil and Architectural Engineering,Xi'an University of Science and Technology,Xi'an 710054,China)
关键词:
低场核磁共振 煤矸石陶粒混凝土 取代率 微观孔结构 抗压强度
Keywords:
low-field nuclear magnetic resonance(NMR) coal gangue ceramsite concrete replacement rate microscopic pore structure compressive strength
分类号:
TU 528
文献标志码:
A
摘要:
为了研究煤矸石陶粒对混凝土微观孔结构特征和抗压强度的影响,基于低场核磁共振(NMR)技术,对煤矸石陶粒体积取代率(0%,20%,40%,60%)的混凝土进行试验,测定煤矸石陶粒混凝土T2弛豫时间谱,进而转化为孔径分布曲线,并计算煤矸石陶粒混凝土孔隙率、最可几孔径和孔级占比等微观孔结构特征,同时通过力学性能试验测试不同取代率煤矸石陶粒混凝土的抗压强度。研究结果表明:煤矸石陶粒掺入混凝土后具有细化孔隙的作用,随着煤矸石陶粒取代率的增加,孔隙率先增大后有所减小,且无害孔占比和少害孔占比增多,有害孔占比和多害孔占比减少,最可几孔径减小,能够有效改善混凝土的微观孔结构特征。此外,随着煤矸石陶粒取代率增大,试件的抗压强度先变小,再由小变大,最后再变小,其中取代率40%时,其抗压强度最优。通过对煤矸石陶粒混凝土孔结构特征的测试,为分析煤矸石陶粒混凝土的耐久性能提供了一定的微观基础。
Abstract:
In order to study the effect of coal gangue ceramsite on the microscopic pore structure and compressive strength of concrete,based on low field nuclear magnetic resonance(NMR)technology,the concrete of coal gangue ceramsite volume replacement rate(0%,20%,40%,60%)are tested to determine the T2 relaxation time spectrum of coal gangue ceramsite concrete.It is then converted into pore size distribution curve,and the microporous structure characteristics such as porosity,most pore size and pore fraction of coal gangue ceramsite concrete are calculated.The mechanical properties test measures the compressive strength of coal gangue ceramsite concrete with different substitution rates.The results show that the gangue ceramsite has the effect of refining pores after being mixed into concrete.With the increase of gangue ceramsite substitution rate,the porosity first increases and then decreases,and the proportion of harmless pore and the proportion of less harmful pores is increased.The proportion of harmful pores and the proportion of harmful pores is reduced,and the pore size is reduced,which can effectively improve the microscopic pore structure of concrete.In addition,with the increase of the replacement rate of coal gangue ceramsite,the compressive strength of the test piece first becomes smaller,then becomes smaller and larger,and finally becomes smaller.When the substitution rate is 40%,the compressive strength is optimal.Through the testing of the pore structure characteristics of coal gangue ceramsite concrete, a certain microscopic foundation is provided for the analysis of the durability of coal gangue ceramsite concrete.

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备注/Memo

备注/Memo:
收稿日期:2019-07-24 责任编辑:李克永
基金项目:国家自然科学基金(41672305); 陕西省重点研发计划(2017ZDXM-SF-082)
通信作者:叶万军(1976-),男,陕西丹凤人,博士,教授,E-mail:63451400@qq.com
更新日期/Last Update: 2020-02-15