振动拌和工艺下混凝土的各项性能研究  

Research on Various Properties of Concrete under Vibration Mixing Process

作　　者：田毅 朱世栋 周力强 田鑫新 TIAN Yi;ZHU Shidong;ZHOU Liqiang;TIAN Xinxin(Gansu Province Highway Traffic Construction Group Co.Ltd.,Lanzhou 730000,China;Gansu Road&Bridge Construction Group,Lanzhou 730000,China;Gansu Province Transportation Research Institute Group Co.Ltd.,Lanzhou 730000,China)

机构地区：[1]甘肃省公路交通建设集团有限公司,甘肃兰州730000 [2]甘肃路桥建设集团有限公司,甘肃兰州730000 [3]甘肃省交通科学研究院集团有限公司,甘肃兰州730000

出　　处：《工业技术创新》2022年第6期111-116,共6页Industrial Technology Innovation

摘　　要：为了研究振动拌和方式对混凝土的各项性能的影响,以具体工程为依托,以控制变量法为研究准则,对混凝土开展试验;以试验数据为研究依据,考察振动拌和工艺对混凝土工作性能、力学性能以及耐久(抗冻)性能的影响,以及相比普通拌和方式的提升效果。研究发现,在振动拌和方式下混凝土的各项性能比普通拌和方式均有明显的提升。在振动拌和工艺下,不同配合比混凝土的流动性能均有增加,坍落度的总体差异在10~15 mm范围内;振动拌和工艺有益于提高不同型号配合比混凝土的抗压强度,C35普通混凝土抗压强度增大11.7%,C40普通混凝土抗压强度增大10.8%,C50普通混凝土抗压强度增大8.5%,总体增益效果在10%左右;两种拌和工艺下,随着冻融循环次数的增加,C40普通混凝土的质量损失率和抗压强度变化率均呈增大趋势,当冻融循环次数达到75次后,振动拌和工艺的增益效果可达到50%左右。因此,在实际工程应用中,建议优选振动拌和技术,提升混凝土的工程质量。In order to study the influences of vibration mixing method on various properties of concretes,the concretes were tested based on the actual project and by taking the control variable method as the research criterion.Based on the experimental data,the influences of vibration mixing process on the workability,mechanical properties and durability(frost resistance)of concrete,as well as the improving effect compared with common mixing method,were investigated.It is found that the performances of concretes by vibration mixing method are obviously improved compared with that by common mixing method.Under the vibration mixing process,the fluidities of concretes with different mix ratios all increase,and the overall slump difference is in the range of 10~15 mm;the vibration mixing process is beneficial to improve the compressive strength of different types of concretes,with compressive strength of C35 ordinary concrete increases by 11.7%,of C40 ordinary concrete increases by 10.8%,of C50ordinary concrete increases by 8.5%,and the overall gaining effect of about 10%.Under the two mixing processes,with the increase of freeze-thaw cycles,the mass loss rate and the change rate of compressive strength of C40 ordinary concrete show an increasing trend.When the freeze-thaw cycles reach 75 times,the gaining effect of vibration mixing process can reach about 50%.Therefore,in practical engineering applications,it is suggested to select the vibration mixing technology as the optimal scheme to improve the engineering quality of concretes.

关 键 词：振动拌和 混凝土 工作性能 力学性能 抗冻性能 坍落度 冻融循环 

分 类 号：TU528[建筑科学—建筑技术科学]