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预填集料高强混凝土抗压强度影响因素研究
引用本文:周孝军,谢琳,牟廷敏,彭建秋,范碧琨. 预填集料高强混凝土抗压强度影响因素研究[J]. 西华大学学报(自然科学版), 2022, 41(3): 99-105. DOI: 10.12198/j.issn.1673-159X.4007
作者姓名:周孝军  谢琳  牟廷敏  彭建秋  范碧琨
作者单位:西华大学建筑与土木工程学院, 四川 成都 610039;四川省钢管混凝土桥梁工程技术研究中心, 四川 成都 610041;西华大学建筑与土木工程学院, 四川 成都 610039;四川省公路规划勘察设计研究院有限公司, 四川 成都 610041;四川省钢管混凝土桥梁工程技术研究中心, 四川 成都 610041
基金项目:四川交通科技项目(2014C-3);西华大学自然科学基金重点项目(Z1420603);西华大学研究生创新基金(SA2000002938)
摘    要:当前工程应用的预填集料混凝土其集料粒径大且组成单一,混凝土强度偏低,应用范围受限.为提高预填集料混凝土抗压强度,本文试验研究制备方式、浆体材料类型、粗集料级配组成等对预填集料混凝土抗压强度的影响.结果表明:分层填筑、振动灌浆比自填充灌浆更有利于提高预填集料混凝土抗压强度;粗集料堆积程度越紧密、空隙率越小,预填集料混凝土...

关 键 词:预填集料混凝土  抗压强度  高强混凝土  浆体流动度  粗集料级配
收稿时间:2021-04-18

Influencing Factors of Compressive Strength of Preplaced Aggregated High Strength Concrete
ZHOU Xiaojun,XIE Lin,MOU Tingmin,PENG Jianqiu,FAN Bikun. Influencing Factors of Compressive Strength of Preplaced Aggregated High Strength Concrete[J]. Journal of Xihua University(Natural Science Edition), 2022, 41(3): 99-105. DOI: 10.12198/j.issn.1673-159X.4007
Authors:ZHOU Xiaojun  XIE Lin  MOU Tingmin  PENG Jianqiu  FAN Bikun
Affiliation:1.School of Architecture and Civil Engineering, Xihua University, Chengdu 610039 China
Abstract:The PAC used in the current project has large aggregate size and single composition, and concrete strength is low. Therefore, the engineering application of PAC is limited. In order to improve the compressive strength of prefilled aggregate concrete, the effects of preparation method, slurry material type and coarse aggregate gradation composition on the compressive strength of prefilled aggregate concrete were studied. The results show that vibration grouting and layered grouting contribute more to the strength of concrete than self-filling grouting. The closer the coarse aggregate accumulation degree is, the smaller the voidage is, and the higher the compressive strength of preplaced aggregate concrete is. The strength of PAC made with high fluidity mortar is higher than that made with clean slurry. Using discontinuous graded coarse aggregate (10 ~ 20 mm∶20 ~ 25 mm= 2∶8, voidage 37%) and high-strength and high-fluidity mortar (330 mm expansion, 28 d compressive strength of 72.2 MPa), the preplaced aggregate high-strength concrete with 28 d compressive strength of 69.4 MPa can be prepared by single vibration molding.
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