| 摘要: |
| 基于压入法原理，提出了1种混凝土超早期弹性模量的测试方法. 采用数值分析方法设计试件尺寸，选用30°球锥形压头作为混凝土超早期弹性模量的测试压头，优化压入深度为5 mm. 通过改变混凝土的水胶比和粉煤灰掺量，并与超声波法相对比，对该方法进行验证. 以初凝时刻的弹性模量0值为起点，传统应力-应变方法最早测得的弹性模量为终点，用这2点之间的连线预测混凝土超早期弹性模量.该预测法与压入法试验结果相比，误差均在30%以内. |
| 关键词: 混凝土 弹性模量 超早期 压入法 压头 |
| DOI：10.3969/j.issn.1007-9629.2023.11.012 |
| 分类号:TU528.01 |
| 基金项目:国家自然科学基金资助项目（52078450）；河北省自然科学基金资助项目（E2021107004）；深圳市科技研发资金资助项目（JSGG20210802152541012） |
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| Determination of Elastic Modulus of Concrete at Ultra-early Age by Indentation Technique |
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WANG Dongli1,2, ZHAO Qingxin2, DONG Bingqiang1, YANG Zeyu1, YUAN Lili3
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1.School of Civil Engineering and Architecture， Northeast Petroleum University， Daqing 163318， China;2.Hebei Province Engineering Research Center for Harmless Synergistic Treatment and Recycling of Municipal Solid Waste， Yanshan University， Qinhuangdao 066004， China;3.Shenzhen Guoyi Park Construction Co.， Ltd.， Research and Development Center， Shenzhen 518040， China
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| Abstract: |
| Based on the principle of the indentation method， a test method for the ultra-early elastic modulus of concrete was proposed. The size of the specimen was designed by numerical analysis method， and the spherical conical indenter with a cone angle of 30° was selected as the test indenter for the ultra-early elastic modulus of concrete， the optimal indentation depth was 5 mm. Comparing with the ultrasonic method， the method was verified by changing the water-binder ratio of concrete and the amount of fly ash . The initial setting time is taken as the zero point and the earliest elastic modulus that can be measured by the traditional stress-strain method as the end point， the two-point line is used to predict the super-early elastic modulus of concrete. To compare with the experimentalresults of the indentation method， the errors are all within 30%. |
| Key words: concrete elastic modulus ultra-early age indentation technique indenter |
