再生粗骨料品质和取代率对再生混凝土力学性能的影响

发布时间：2018-03-05 17:09

本文选题：再生粗骨料　切入点：整形　出处：《青岛理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：进入21世纪,我国的城市化进程日益加快。一方面,新建建筑消耗着大量的自然资源;另一方面,大量旧建筑被拆迁造成的建筑垃圾大有包围城市的趋势。再生混凝土技术完美解决了建筑材料的资源短缺和建筑垃圾的污染环境问题。但由于再生骨料的性能较差,严重限制了再生混凝土的应用。许多专家学者研究了物理强化法和化学强化法对再生骨料品质的改善作用,不同的制备技术和强化方法所制备的再生粗骨料的品质不同,而再生粗骨料的品质和取代率对再生混凝土性能的影响很大。因此,有必要研究再生粗骨料的品质和取代率、胶凝材料用量等对再生混凝土性能的影响。在国家自然科学基金(51378270,51208272)的资助下,本文进行了以下研究工作:1.依照当前比较有效的再生粗骨料强化方法,制备六种不同品质的再生粗骨料,分别为简单破碎再生粗骨料(JP)、一次颗粒整形再生粗骨料(YK)、二次颗粒整形再生粗骨料(EK)、简单破碎化学强化再生粗骨料(JPH)、一次颗粒整形化学强化再生粗骨料(YKH)和二次颗粒整形化学强化再生粗骨料(EKH)。2.研究再生粗骨料品质和取代率、胶凝材料用量对再生混凝土工作性能与力学性能的影响,并基于试验研究结果建立了再生混凝土的强度公式。3.在混凝土配合比一定的条件下,胶凝材料的强度等级对混凝土的强度影响显著,为了研究胶凝材料强度对再生混凝土力学性能的影响,试验分别在P.O 52.5水泥、P.O 42.5水泥和P.O 32.5水泥中,掺入不同比例的粉煤灰(10%、20%、30%、40%)来改变胶凝材料的强度,研究胶凝材料用量对再生混凝土抗压强度的影响。研究表明,物理和化学强化后再生混凝土的性能得到明显提升。以胶凝材料用量400kg/m3为例,取代率为100%时,与普通混凝土相比,JP再生混凝土的用水量增加了11.1%,28d抗压强度降低了19.7%;JPH再生混凝土的用水量增加了8.6%,28d抗压强度降低了24.5%;YK再生混凝土的用水量增加了6.6%,28d抗压强度降低了9.8%;YKH再生混凝土的用水量增加了4.6%,28d抗压强度降低了15.6%;EK再生混凝土的用水量增加了6.1%,28d抗压强度降低了1.4%;EKH再生混凝土的用水量增加了2.5%,28d抗压强度降低了14.4%。经过物理强化后的EK再生混凝土的力学性能最好。物理化学复合强化后的EKH再生混凝土28d抗压强度略有降低,但其工作性能最优,孔隙结构及抗渗耐久性能得到改善,所以其综合性能最佳。通过试验分析,将再生混凝土28d抗压强度设置为因变量Y,灰水比(C/W)与再生粗骨料取代率((?)%)设置为自变量(X1、X2)。可得JP再生混凝土的28d抗压强度公式为：再生混凝土的28d抗压强度公式为：再生混凝土的28d抗压强度公式为：再生混凝土的28d抗压强度公式为：再生混凝土的28d抗压强度公式为再生混凝土的28d抗压强度公式为：由强度公式(?)的系数可知,再生粗骨料品质对再生混凝土力学性能的不利影响大小为：JPH再生粗骨料YKH再生粗骨料JP再生粗骨料=EKH再生粗骨料YK再生粗骨料EK再生粗骨料。胶凝材料强度对再生混凝土力学性能的影响显著,试验结果表明,普通硅酸盐水泥掺入粉煤灰(0%、10%、20%、30%、40%),可以配置强度等级在C10～C60的再生混凝土。
[Abstract]:In twenty-first Century, the city is accelerating the process of China's new buildings. On the one hand, consuming large amounts of natural resources; on the other hand, a lot of old building demolition caused by construction waste is surrounded by the city. The trend of recycled concrete technology has solved the problem of environmental pollution and the resource shortage of building materials and construction waste. But because of the poor performance of the recycled aggregate, severely limits the application of recycled concrete. Many experts and scholars have studied the physical and chemical strengthening reinforcement effect on improving the quality of recycled aggregates, different preparation techniques of different methods and strengthen the preparation of recycled coarse aggregate quality, and recycled coarse aggregate replace rate and quality effect on performance of recycled concrete. Therefore, it is necessary to study the rate of substitution of recycled coarse aggregate quality and effect of cementitious materials on the properties of recycled concrete in the country since. Natural Science Fund (5137827051208272) funding, this paper carried out the following research work: 1. in accordance with the recycled coarse aggregate effective strengthening method, the preparation of six different quality of recycled coarse aggregate, were simply crushed recycled coarse aggregate (JP), a particle shaping recycled coarse aggregate (YK), two particle shaping recycled coarse aggregate (EK), chemical enhanced simple crushing recycled coarse aggregate (JPH), a chemical enhanced particle shaping recycled coarse aggregate (YKH) and two chemical enhanced particle shaping recycled coarse aggregate (EKH).2. of recycled coarse aggregate replacement rate and quality, affect the amount of cementitious materials on the performance and the mechanical performance of recycled concrete, and the test results is established based on the strength of recycled concrete formula.3. in concrete mix ratio under certain conditions, impact strength of cementitious materials on the strength grade of concrete significantly, in order to study the glue Effect of strength of cementitious materials on the mechanical properties of recycled concrete, cement test respectively in P.O 52.5, P.O 42.5 and P.O 32.5 in cement cement, mixing different proportions of fly ash (10%, 20%, 30%, 40%) to change the strength of the cement, the amount of cementitious materials mixed effects on the compressive strength of concrete regeneration. The study shows that the performance of recycled concrete after reinforcement of physics and chemistry have been improved significantly. The content of cementitious materials 400kg/m3 for example, substitution rate was 100%, compared with ordinary concrete, the recycled concrete with JP content increased by 11.1%, 28d compressive strength decreased by 19.7%; the JPH of recycled concrete water consumption increased by 8.6% 28d, the compressive strength decreased by 24.5%; the YK of recycled concrete water consumption increased by 6.6%, 28d compressive strength decreased by 9.8%; the YKH of recycled concrete water consumption increased by 4.6%, 28d compressive strength decreased by 15.6%; the EK of recycled concrete water consumption increase With 6.1%, 28d compressive strength decreased by 1.4%; the EKH of recycled concrete with water increased 2.5%, compressive strength of 28d 14.4%. decreased after EK mechanical properties of recycled concrete after reinforcement. The best physical physical and chemical composite strengthened EKH compressive strength of recycled concrete 28d decreased slightly, but its performance is optimal, pore structure durability and impermeability is improved, so the best comprehensive performance. Through experimental analysis, the concrete compressive strength of 28d regeneration as the dependent variable Y, cement water ratio (C/W) and the replacement ratio of recycled coarse aggregate ((?)%) set as independent variables (X1, X2). The formula of compressive strength of 28d JP recycled concrete: 28d formula of the compressive strength of recycled concrete: 28d formula of the compressive strength of recycled concrete: 28d formula of the compressive strength of recycled concrete: 28d formula of the compressive strength of recycled concrete as recycled concrete 28d The compressive strength of the formula: by strength formula (?) the coefficient of the recycled coarse aggregate quality adverse effects on the mechanical properties of recycled concrete size: JPH YKH recycled coarse aggregate of recycled coarse aggregate JP recycled coarse aggregate of recycled coarse aggregate =EKH YK EK recycled coarse aggregate of recycled coarse aggregate. Effects of cementitious materials on the mechanical strength of recycled concrete the performance is remarkable, test results show that the ordinary portland cement mixed with fly ash (0%, 10%, 20%, 30%, 40%), you can configure the strength of recycled concrete in C60 ~ C10.

【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528

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