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   （北京市建筑工程研究院有限責(zé)任公司，北京100039）

[摘要]  鉆芯法作為檢測混凝土抗壓強(qiáng)度的直接方法被廣泛應(yīng)用。隨著實(shí)際工作對檢測要求的提高，現(xiàn)有鉆芯技術(shù)已不能完全滿足。目前對直徑為50mm的超小芯樣應(yīng)用上的主要障礙是小芯樣的尺寸效應(yīng)及離散性問題。分析了國內(nèi)外大量的研究資料,并制作了230個芯樣進(jìn)行不同直徑芯樣間的強(qiáng)度比對。泵送混凝土50mm直徑的小芯樣抗壓強(qiáng)度值服從正態(tài)分布，可以運(yùn)用統(tǒng)計學(xué)中的知識進(jìn)行分析統(tǒng)計。通過統(tǒng)計學(xué)中顯著性假設(shè)檢驗(yàn)，泵送混凝土抗壓強(qiáng)度用50mm直徑的小芯樣測得的平均值與用標(biāo)準(zhǔn)試件測得的平均值沒有顯著差異。

[關(guān)鍵詞]  混凝土抗壓強(qiáng)度；50mm直徑超小芯樣；尺寸效應(yīng)；離散性

中圖分類號：TU528   文獻(xiàn)標(biāo)識碼：A  文章編號：    

作者簡介：李翀，碩士，高級工程師，Email:lichong0608@qq.com。

Research on testing compressive strength of concrete by the ultra-small diameter concrete core

Li Chong，Fan Jun，Zhang Jianyong

(Beijing Building Construction Research Institute, Beijing 100039, China)

Abstract: As a direct method to test concrete compression strength, core-drill method is widely used. With the increasingly strict testing requirements in practical work, the existing core-drill method can't fully meet the demands. Now the main difficult of using 50mm small diameter core is due to the size effect of small core sample and discreteness in statistics. Available literatures at home and abroad were analyzed. 230 specimens were made so that comparision among strengths from cores with different diameters. The compressive strength values of pumped concrete 50mm small core samples follow normal distribution, and can be carried on analytic statistics with the knowledge of statistics. The examination of significant hypothesis in statistics shows that there is no obvious difference in the average of compression strength of pumped concrete, no matter it is tested by the 50mm core sample or the standard test specimen.

Keywords: compressive strength of concrete; 50mm-diameter ultra-small cores; size effect; discreteness

參 考 文 獻(xiàn)

[1] 金維芬, 李為杜. 鉆芯法檢測結(jié)構(gòu)混凝土的抗壓強(qiáng)度[J]. 工程質(zhì)量, 2007(19)：48~50

[2] 張立軍, 安明喆. 混凝土強(qiáng)度的尺寸效應(yīng)評述[J]. 煤炭工程, 2005（10）:51-52.

[3] 賈俊平, 金勇進(jìn). 統(tǒng)計學(xué)[M]. 北京: 中國人民大學(xué)出版社, 2004:128-305.

[4] 張明軒. 框架結(jié)構(gòu)外觀缺陷和尺寸偏差的統(tǒng)計分析[J].工程質(zhì)量, 2004(5),:38-41