【摘要】：回彈法是現(xiàn)場混凝土質(zhì)量檢測最常用的一種無損檢測方法,其通過回彈值及碳化深度兩個(gè)指標(biāo)推定混凝土抗壓強(qiáng)度,使推定強(qiáng)度的誤差精度保持在允許范圍內(nèi)。在回彈過程中,影響泵送混凝土回彈特性及誤差的因素有很多,其中回彈儀能量、澆筑面及齡期對其影響比較大,對這三個(gè)方面的研究可以有效提高現(xiàn)場檢測的精度,對推廣回彈法在泵送混凝土板類構(gòu)件及長齡期泵送混凝土中的應(yīng)用具有重要的現(xiàn)實(shí)意義。試驗(yàn)直接接取攪拌站泵送混凝土制作成型,采用自然養(yǎng)護(hù)模擬實(shí)際工況,并對到達(dá)齡期的不同強(qiáng)度等級泵送混凝土及預(yù)留的長齡期泵送混凝土進(jìn)行了回彈、抗壓、碳化試驗(yàn),通過對所測數(shù)據(jù)的分析,研究了不同能量回彈儀的回彈特性,給出了不同澆筑面的回彈值修正關(guān)系,并提出了幾種提高長齡期泵送混凝土回彈檢測精度的方法。研究結(jié)果表明:(1)隨著能量的升高,回彈儀適用的泵送混凝土強(qiáng)度不斷升高;2.207J回彈儀的適用范圍為30~60MPa,4.5J回彈儀的適用范圍為40~70MPa,5.5J回彈儀的適用范圍為40~87.4MPa;低齡期時(shí),強(qiáng)度增長是影響回彈值增長的主要因素,隨著齡期的增長,碳化的影響逐漸增大;(2)泵送混凝土抗壓強(qiáng)度的增長對澆筑頂面回彈值的影響最大;隨著水膠比減小、齡期的升高,三個(gè)澆筑面的回彈值差距逐漸縮小;底面回彈值與澆筑側(cè)面回彈值的相關(guān)性較好,可以進(jìn)行回彈值修正增強(qiáng)推定準(zhǔn)確度;(3)長齡期泵送混凝土回彈值的升高主要由碳化引起,即“碳化效應(yīng)”對回彈值增長的影響大于抗壓強(qiáng)度;長齡期泵送混凝土可以通過加深碳化修正深度、重新擬合以及系數(shù)修正地方曲線的方式提高回彈法的檢測精度。
[Abstract]:Springback method is one of the most commonly used nondestructive testing methods in the field of concrete quality testing. The rebound value and carbonation depth are used to predict the compressive strength of concrete so that the error accuracy of the predicted strength is kept within the allowable range. In the springback process, there are many factors that affect the springback characteristics and error of pumping concrete, among which the energy, pouring surface and age of the springback meter have a great influence on it. The research on these three aspects can effectively improve the accuracy of field detection. It has important practical significance for popularizing springback method in pumping concrete slabs and long term pumping concrete. The concrete of mixing station was directly taken in the test to make the concrete, and natural curing was used to simulate the actual working conditions. The springback, compression and carbonization tests of the pumping concrete with different strength grades and the reserved long age pumping concrete were carried out. Based on the analysis of the measured data, the springback characteristics of different energy springback instruments are studied, and the relationship between the springback values of different pouring surfaces is given, and several methods to improve the precision of springback detection of pumping concrete with long age are put forward. The results are as follows: (1) with the increase of energy, the strength of pumping concrete used by the elastometer increases continuously. The suitable range of the resilience instrument is 30 ~ 60MPA ~ (4.5J). The range of application is 40 ~ (70) MPA ~ (5.5J) and the range is 40 ~ 87.4MPa at a young age, and the following results are obtained: (1) with the increase of energy, the range of application of the recoil is 2.207J. The increase of strength is the main factor affecting the increase of springback value. With the increase of age, the influence of carbonization increases gradually. (2) the increase of compressive strength of pumping concrete has the greatest effect on the springback value of the topping surface, and with the decrease of water-binder ratio, the age increases. The difference between springback value of three pouring surfaces was gradually narrowed, the correlation between the springback value of bottom surface and the springback value of pouring side was better, the springback value could be modified to enhance the presumption accuracy; (3) the increase of springback value of long-age pumping concrete was mainly caused by carbonization. That is, "carbonation effect" has more influence on the increase of rebound value than compressive strength, and the precision of springback detection can be improved by means of deepening carbonization correction depth, refitting and coefficient modifying local curve.
【學(xué)位授予單位】：蘭州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU528.53

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