884aa四虎影成人精品,99久久国产综合精品女图图等你,97在线观看永久免费视频,久久精品国产精品亚洲38,ⅵdeodesetv性欧美

(1 河北省混凝土質(zhì)量檢測(cè)技術(shù)創(chuàng)新中心, 廊坊 065000;2 廊坊市陽(yáng)光建設(shè)工程質(zhì)量檢測(cè)有限公司, 廊坊 065000)

摘要: 針對(duì)混凝土抗壓強(qiáng)度檢測(cè),提出了一種弧面對(duì)壓法檢測(cè)技術(shù). 在混凝土立方體試塊中鉆取直徑 38mm 的微小芯樣作為弧面對(duì)壓試件,采用自行研制的弧面對(duì)壓儀在試件的兩個(gè)相對(duì)弧形側(cè)面施加壓力,測(cè)得試件破型時(shí)弧面對(duì)壓力值,并計(jì)算得到弧面對(duì)壓試件破型時(shí)的應(yīng)力值. 同時(shí)測(cè)試同批澆筑成型的混凝土標(biāo)準(zhǔn)立方體試塊抗壓強(qiáng)度值. 根據(jù) 7 種不同混凝土強(qiáng)度的 203 組試驗(yàn)數(shù)據(jù),建立了弧面對(duì)壓試件應(yīng)力與混凝土抗壓強(qiáng)度間的相關(guān)關(guān)系,依據(jù)最小二乘法原理進(jìn)行回歸,擬合得到弧面對(duì)壓法測(cè)強(qiáng)曲線. 給出弧面對(duì)壓法檢測(cè)技術(shù)的試驗(yàn)方法和操作要點(diǎn). 最后,在實(shí)體剪力墻結(jié)構(gòu)構(gòu)件上鉆取試件,進(jìn)行了弧面對(duì)壓法與鉆芯法測(cè)試結(jié)果對(duì)比. 結(jié)果表明,弧面對(duì)壓法測(cè)強(qiáng)曲線具有較高的精度. 弧面對(duì)壓法檢測(cè)技術(shù)適用于混凝土強(qiáng)度等級(jí) C20 ~ C70 密集配筋現(xiàn)澆結(jié)構(gòu)構(gòu)件與裝配式結(jié)構(gòu)構(gòu)件混凝土抗壓強(qiáng)度檢測(cè).

關(guān)鍵詞: 弧面對(duì)壓法; 混凝土抗壓強(qiáng)度; 測(cè)強(qiáng)曲線; 檢測(cè)技術(shù)中圖分類號(hào):TU528. 1,TU528. 31 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002-848X(2022)03-0089-05

DOI:10. 19701 / j. jzjg. LS210295

Research on technology of detecting concrete compressive strength inspection byopposite arc surface compression method

HAN Chunlei1,2, WANG Dayong1,2

(1 Hebei Concrete Quality Testing Technology Innovation Center, Langfang 065000, China;2 Langfang Yangguang Construction Quality Test Co., Ltd., Langfang 065000, China)

Abstract: Aiming at the detection of concrete compressive strength, an opposite arc surface compression method detectiontechnology was proposed. A micro core sample with diameter of 38mm was drilled from concrete cube as the specimen of theopposite arc surface compression, and the self-developed opposite arc surface compression gauge was used to apply pressureon the two opposite arc sides of the specimen. Opposite arc surface compression value was measured when the specimen isbroken, and the stress value was obtained by calculation when the specimen of the opposite arc surface compression isbroken. Simultaneously, the compressive strength value of the standard cubic block of concrete poured in the same batchwas measured. The relationship between the stress value of the arc surface compression specimens and the compressivestrength of concrete was established by using 203 sets of experiment data on concretes with 7 different strengths. Theopposite arc surface compression strength curve was regressed by the least square method. The test methods and operationalguidelines of the opposite arc surface compression method detection technique were given. Finally, the specimens weredrilled on the structural member of the solid shear wall, and the test results of the opposite arc surface compression methodand the core drilling method were compared. The results show that opposite arc surface compression strength curve has ahigh accuracy. The opposite arc surface compression method detection technique can be used for the quality inspection ofconcrete strength C20 ~ C70 of densely reinforced cast-in-place structural elements and prefabricated buildings.

Keywords: opposite arc surface compression method; compressive strength of concrete; strength curve; detectiontechnology

第一作者:韓春雷,學(xué)士,教授級(jí)高級(jí)工程師,主要從事混凝土質(zhì)量檢測(cè)技術(shù)研究,Email:lfygjchcl@ 163. com.

[引用本文] 韓春雷,王大勇. 弧面對(duì)壓法檢測(cè)混凝土抗壓強(qiáng)度技術(shù)研究 [ J] . 建筑結(jié)構(gòu),2022,52 ( 3) :89-93.HAN Chunlei,WANG Dayong. Research on technology of detecting concrete compressive strength inspection by oppositearc surface compression method[ J] . Building Structure,2022,52(3) :89-93.