摘要
为研究影响再生混凝土抗压强度的因素,把实验室废弃C30混凝土试块加工处理后制成粒径为5~31.5 mm的骨料,并对这种骨料按不同掺量配制的混凝土试样进行抗压强度试验。试验表明,水灰比和龄期相同时,混凝土的抗压强度随着再生骨料掺入量的增加先增大后减小。结合正交试验法,考虑到再生骨料的取代率、水灰比、混凝土的龄期等因素对混凝土抗压强度的影响,同时,也考虑到这些因素之间交互作用的因素对其影响。结合方差分析法建立了影响混凝土抗压强度的影响率及评价方法。研究发现,影响混凝土抗压强度的主要因素是龄期,其次为再生粗骨料的掺入量,最后为水灰比;而交互作用因素中,粗骨料取代率与水灰比交互作用影响最大,龄期与粗骨料取代率的交互作用影响最小,此成果对再生混凝土应用具有重要的理论意义。
In order to study the influence factors of compressive strength on recycled concrete,recycled aggregate in the range of 5 ~ 31.5 mm was obtained from waste samples of C30 in the laboratory through dealing and cube compressive strength test was conducted on recycled coarse aggregate concrete under different conditions.The results indicate that the compressive strength of the concrete decreases greatly with larger blending amount of recycled coarse aggregate in the same water-cement ratio and the age.Orthogonal design is adopted to arrange the test by fully taking into account water-cement ratio,the replacement of recycled coarse aggregate,the age,and the interaction between one factor and the other.The analysis of variance is established and analyzed the influence rate of the compressive strength.It also concludes that order factor affecting the compressive strength of recycled concrete is the age,the replacement of recycled coarse aggregate,and water-cement ratio.The order of the interaction function is as follows： the replacement rate and water-cement ratio,water-cement ratio and the age,the replacement rate and the age.
出处
《河南理工大学学报（自然科学版）》
CAS
北大核心
2016年第5期738-744,共7页
Journal of Henan Polytechnic University（Natural Science）
基金
河南省科技计划重点攻关项目(152102310204
132102310334)
关键词
再生粗骨料混凝土
抗压强度
正交试验
方差分析
recycled coarse aggregate concrete
compressive strength
orthogonal test
the analysis of variance
