本文選題：高性能再生混凝土 + 再生粗骨料　； 參考：《福州大學》2014年碩士論文

【摘要】：隨著經濟發(fā)展,巨大的混凝土生產量使資源、能源、環(huán)境以及相關的社會問題越發(fā)突出,可持續(xù)發(fā)展和環(huán)境保護戰(zhàn)略迫切需要有效合理地利用廢棄混凝土,再生混凝土也因此應運而生。近年來國內外開展了大量關于再生混凝土技術的研究,但仍存在許多問題。鑒于此,本文主要針對高性能再生混凝的自生收縮影響因素進行研究。1、通過粗骨料基本性能的研究,分析再生粗骨料與天然粗骨料的差別。試驗結果表明與天然粗骨料相比,再生粗骨料性能較差,具體表現為骨料較粗、表觀密度較低、堆積密度較小、孔隙率較大、吸水率較高以及壓碎指標大。2、參照普通混凝土高性能化的方法,以混凝土工作性能為標準,控制其坍落度在180-220mm,采用凈漿裹石工藝,配制C30強度等級的高性能再生混凝土。試驗結果表明再生粗骨料使混凝土工作性能變差,單摻粉煤灰以及復摻粉煤和礦渣可以改善再生混凝土工作性能。3、通過混凝土基本力學性能試驗,分析再生粗骨料、粉煤灰摻量、粉煤灰和礦渣復摻量對高性能再生混凝土力學性能的影響。試驗結果表明：加入再生粗骨料使混凝土的立方體抗壓強度、彈性模量降低；隨著粉煤灰摻量、粉煤灰和礦渣復摻量增加,混凝土力學性能下降,但是復摻粉煤灰和礦渣的混凝土力學性能下降程度較小。4、通過混凝土自生收縮試驗,分析再生粗骨料、粉煤灰摻量、復摻粉煤灰和礦渣量對高性能再生混凝土自生收縮性能的影響,并分析高性能再生混凝土同普通混凝土、高性能混凝土、自密實混凝土自生收縮的區(qū)別。試驗結果表明,再生粗骨料對控制自生收縮不利,單摻粉煤灰可有效改善自生收縮,復摻粉煤灰和礦渣相比單摻粉煤灰更有利于控制自生收縮,高性能再生混凝土的自生收縮發(fā)展規(guī)律同普通混凝土、高性能混凝土、自密實混凝土一致,但自生收縮值較大。5、分析比較幾個常用的自生收縮計算模型與本文試驗值的區(qū)別,選取較適用的模型作為基準模型,結合本文自生收縮試驗結果提出修正參數,建立適用于高性能再生混凝土的自生收縮預測模型。
[Abstract]:With the development of economy, the huge concrete production has made the resources, energy, environment and related social problems more prominent. Sustainable development and environmental protection strategies urgently need to make effective and rational use of abandoned concrete, Recycled concrete also arises at the historic moment. In recent years, a lot of research on recycled concrete technology has been carried out at home and abroad, but there are still many problems. In view of this, this paper mainly focuses on the factors affecting the autogenous shrinkage of high performance regenerated coagulant. 1. Through the study of the basic properties of coarse aggregate, the difference between regenerated coarse aggregate and natural coarse aggregate is analyzed. The experimental results show that the properties of regenerated coarse aggregate are worse than that of natural coarse aggregate, which are characterized by coarse aggregate, low apparent density, low stacking density and high porosity. According to the method of high performance of ordinary concrete, the slump of concrete is controlled in 180-220 mm, and the C30 strength grade high performance recycled concrete is prepared by using the technology of clean paste and stone wrapping, referring to the method of high performance of ordinary concrete, taking the working performance of concrete as the standard and controlling its slump in 180-220 mm. The test results show that the recycled coarse aggregate makes the working performance of concrete worse, and the working performance of recycled concrete can be improved by adding fly ash, coals and slag. The basic mechanical properties of recycled concrete are analyzed through the tests of the basic mechanical properties of recycled aggregate. The effect of fly ash content, fly ash and slag content on mechanical properties of high performance recycled concrete. The experimental results show that the cube compressive strength and elastic modulus of concrete are decreased by adding recycled coarse aggregate, and the mechanical properties of concrete decrease with the increase of fly ash and slag content. However, the mechanical properties of concrete mixed with fly ash and slag decreased slightly. 4. Through the test of autogenous shrinkage of concrete, the recycled coarse aggregate and the content of fly ash were analyzed. The effect of the amount of fly ash and slag on the autogenous shrinkage of high performance recycled concrete is analyzed, and the difference between high performance recycled concrete and ordinary concrete, high performance concrete and self compacting concrete is analyzed. The test results show that regenerated coarse aggregate is unfavorable to control the autogenous shrinkage, and the addition of fly ash can effectively improve the autogenous shrinkage, and the addition of fly ash and slag is more favorable to control the autogenous shrinkage than the single addition of fly ash. The development law of autogenous shrinkage of high performance recycled concrete is consistent with that of ordinary concrete, high performance concrete and self compacting concrete, but the value of autogenous shrinkage is larger. 5. The differences between several commonly used calculation models of autogenous shrinkage and the experimental values in this paper are analyzed and compared. Taking the more suitable model as the benchmark model and combining with the results of the autogenous shrinkage test in this paper, the modified parameters are proposed, and the prediction model of the autogenous shrinkage suitable for high performance recycled concrete is established.
【學位授予單位】：福州大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU528

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本文編號：2116924