本文選題：再生混凝土 + 高性能��； 參考：《福州大學(xué)》2013年碩士論文

【摘要】：隨著建筑業(yè)的發(fā)展,再生混凝土的研究與應(yīng)用已經(jīng)成為土木工程中一個重要的發(fā)展方向。目前,國內(nèi)對于再生混凝土已經(jīng)有了較深入的研究,但對高性能再生混凝土的研究較少,特別是對高性能再生混凝土的自生收縮性能的研究還少見報道。由于再生粗骨料的特性,再生混凝土的自生收縮有別于普通混凝土。因此,本文開展了對高性能再生混凝土自生收縮性能的試驗研究,旨在優(yōu)化高性能再生混凝土的自生收縮性能。主要工作與結(jié)論如下：1、利用平均強度C30的廢棄混凝土生產(chǎn)再生粗骨料,參考普通混凝土高性能化的途徑,通過試驗配制出C40等級的高性能再生混凝土,其坍落度在200mmm左右,滿足現(xiàn)代商品混凝土的泵送要求。進行了高性能再生混凝土基本力學(xué)性能試驗,其結(jié)果表明,隨著再生粗骨料取代率的增加,再生混凝土的抗壓強度、彈性模量有不同程度的降低。預(yù)濕法、凈漿裹石工藝、摻加硅灰的凈漿裹石工藝都不同程度提高了再生混凝土的抗壓強度、彈性模量。2、采用非接觸法測量高性能再生混凝土的自生收縮。其整機一體化的設(shè)置和非接觸的測定方式提高了試驗結(jié)果的準確性及可靠性。自生收縮試件早期出現(xiàn)了膨脹現(xiàn)象,在混凝土的膨脹達到峰值后,混凝土開始產(chǎn)生自生收縮變形。因此,本文選擇混凝土的膨脹峰值點作為自生收縮的起點,以便更好地指導(dǎo)工程實踐。3、通過自生收縮試驗研究了不同再生粗骨料取代率、不同的再生粗骨料強化預(yù)處理方法對高性能再生混凝土自生收縮的影響。試驗結(jié)果表明,隨著再生粗骨料取代率的增加,再生混凝土的自生收縮也隨著增大。在相同條件下,再生混凝土的自生收縮比普通混凝土更大,特別是混凝土的早期自生收縮。預(yù)濕法能夠很好地改善再生混凝土的自生收縮性能,凈漿裹石工藝較好地改善了其自生收縮性能,而摻加硅灰的凈漿裹石工藝則增加了再生混凝土的自生收縮。4、分析比較了各普通高性能混凝土的自生收縮預(yù)測模型的優(yōu)缺點及與本文試驗結(jié)果的差異。選取歐洲規(guī)范BS EN模型為參考,通過參數(shù)修正提出適用于高性能再生混凝土自生收縮的預(yù)測模型。
[Abstract]:With the development of construction industry, the research and application of recycled concrete has become an important development direction in civil engineering. At present, there has been more in-depth research on recycled concrete in China, but there are few researches on high performance recycled concrete, especially on the in-situ shrinkage of high performance recycled concrete. Due to the characteristics of recycled coarse aggregate, the self-growth shrinkage of recycled concrete is different from that of ordinary concrete. Therefore, an experimental study on the autogenous shrinkage of high performance recycled concrete is carried out in order to optimize the autogenous shrinkage of high performance recycled concrete. The main work and conclusions are as follows: 1. The recycled coarse aggregate is produced by using the waste concrete with average strength of C30. The slump of the recycled concrete of C40 grade is about 200mmm through the experiment, referring to the way of high performance of ordinary concrete. Meet the pumping requirements of modern commercial concrete. The basic mechanical properties of high performance recycled concrete were tested. The results showed that the compressive strength and elastic modulus of recycled concrete decreased in varying degrees with the increase of the replacement ratio of recycled coarse aggregate. The compressive strength and elastic modulus of recycled concrete were improved to some extent by pre-wetting method, paste and stone wrapping process and adding silica fume. The non-contact method was used to measure the autogenous shrinkage of high performance recycled concrete. The accuracy and reliability of the test results are improved by the integrative setting of the whole machine and the non-contact measurement method. When the expansion of concrete reaches its peak value, the concrete begins to produce autogenous shrinkage deformation. Therefore, in this paper, the expansion peak point of concrete is chosen as the starting point of autogenous shrinkage, in order to guide engineering practice better. The replacement rate of different recycled coarse aggregate is studied through the test of autogenous shrinkage. The effect of different recycled coarse aggregate strengthening pretreatment methods on the autogenous shrinkage of high performance recycled concrete. The experimental results show that the autogenous shrinkage of recycled concrete increases with the increase of the replacement ratio of recycled coarse aggregate. Under the same conditions, the autogenous shrinkage of recycled concrete is greater than that of ordinary concrete, especially the early autogenous shrinkage of concrete. The prewetting method can improve the in-situ shrinkage of recycled concrete, and the self-growing shrinkage of recycled concrete can be improved by the process of clean paste and stone wrapping. On the other hand, the self-growing shrinkage of recycled concrete is increased with the addition of silica fume. The advantages and disadvantages of the prediction models of the autogenous shrinkage of ordinary high performance concrete and the difference between the experimental results and the experimental results are analyzed and compared. Based on the reference of the European Standard BS en model, a prediction model for the autogenous shrinkage of high performance recycled concrete is proposed by modifying the parameters.
【學(xué)位授予單位】：福州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU528

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