高强预填集料混凝土灌浆料制备与灌注效果评价  

Preparation and evaluation of perfusion effect of grouting material for high-strength preplaced aggregate concrete

作　　者：苏雷 龚佳丽 周孝军[2,3] 丁庆军 谢琳 SU Lei;GONG Jiali;ZHOU Xiaojun;DING Qingjun;XIE Lin(Zibo Construction Engineering Quality,Safety and Environmental Protection Supervision Station,Zibo 255000,China;School of Architecture and Civil Engineering,Xihua University,Chengdu 610039,China;Sichuan Steel Tube Concrete Bridge Engineering Technology Research Center,Chengdu 610041,China;School of Material Science and Engineering,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]淄博市建筑工程质量安全环保监督站,山东淄博255000 [2]西华大学建筑与土木工程学院,四川成都610039 [3]四川省钢管混凝土桥梁工程技术研究中心,四川成都610041 [4]武汉理工大学材料科学与工程学院,湖北武汉430070

出　　处：《混凝土》2024年第4期171-177,共7页Concrete

摘　　要：预填集料混凝土是在模板内预铺粗集料,然后注入灌浆料填充集料间隙而形成的一种新型混凝土。作为预填集料混凝土的重要组成部分,灌浆料的性能与灌注质量直接影响预填集料混凝土的整体性能,但现有灌浆料因流动度或强度不足,难以满足高强预填集料混凝土的灌注要求。设计正交试验,探究了水胶比、胶砂比和胶凝材料体系对灌浆料工作性能与力学性能的影响规律,提出高强大流态灌浆料的制备方法,并采用重力灌注和泵送灌注进行了预填集料混凝土模拟灌注试验,从试件外观质量、灌注密实度和抗压强度等方面验证了灌浆料的灌注效果。结果表明:水胶比是影响灌浆料综合性能的主要因素,胶砂比主要影响灌浆料的流动性,双掺粉煤灰和硅灰可以协同提升灌浆料的工作性能与力学性能。高强预填集料混凝土采用泵送灌注效果优于重力灌注,相同条件下泵送灌注可达到更高密实度,但利用净浆或流动度较高的砂浆作为灌浆料时,重力灌注法也能达到较好密实灌注效果。采用0.3水胶比、双掺15%的粉煤灰和4%的硅灰,制备出流动度值为35 s的净浆,其28 d抗压强度为70.9 MPa,密实灌注的预填集料混凝土28 d抗压强度可达96.8 MPa。Preplaced aggregate concrete is a new type of concrete formed by pre-paving coarse aggregate in the formwork,then injecting grouting material to fill the aggregate gap.As an important component of preplaced aggregate concrete,the performance of the grouting material and perfusion quality influence the entire performance of the preplaced aggregate concrete directly,but the existing grouting material is difficult to meet the perfusion requirements of the high-strength preplaced aggregate concrete due to the lack of fluidity or strength.The orthogonal test was designed to explore the influence law of water-cement ratio,cement-sand ratio and cementitious material system on the working performance and mechanical properties of the grouting material,the preparation method of high-strength and high-fluidity grouting material was proposed.And simulated flling test of preplaced aggregate concrete was carried out with gravity perfusion and pumping perfusion,the perfusion effect of grouting material was verified from the aspects of appearance quality of test specimens,flling density and compressive strength.The results show that the water-cement ratio is the main factor affecting the comprehensive performance of the grouting material,the cement-sand ratio has a great impact mainly on the fluidity of the grouting material,double adding fly ash and silica fume can synergistically improve the working and mechanical properties of the grouting material.The effect of pumping perfusion used in the high-strength preplaced aggregate concrete is better than that of gravity perfusion,which can achieve higher compactness under the same conditions,but gravity perfusion can also reach a good perfusion density when using net slurry or higher-fluidity mortar as grouting material.With water-cement ratio of 0.3,double adding 15%fly ash and 4%silica fume,the net slurry with 35 sfluidity value was prepared,and its 28 d compressivestrength value was 70.9 MPa,the28 d compressive strength ofthe preplaced aggregate concrete with dense perfusion can

关 键 词：预填集料混凝土 灌浆料 正交试验 流动度 密实度 力学性能 

分 类 号：TU528.01[建筑科学—建筑技术科学]