超高性能水泥基自流平砂浆的试验研究  

Experimental study on ultra high performance cement based self leveling mortar

作　　者：秦华 陈煊 QIN Hua;CHEN Xuan(Nanning College of Technology,Guilin 541000,China)

机构地区：[1]南宁理工学院,广西桂林541000

出　　处：《混凝土》2024年第7期174-177,185,共5页Concrete

基　　金：广西夏热冬冷地区近零能耗住宅建筑维护结构技术研究(2023KY1720)。

摘　　要：为了改善传统混凝土面层找平应用砂浆带来施工效率低、自流平效果差、流动性低的缺陷,试验研究超高性能水泥基自流平砂浆。通过水胶比试验确定最优水胶比;外加剂单因素试验研究对砂浆流动度、强度、黏度等影响;多元胶凝材料体系研究对砂浆性能综合影响,并确定最佳配合体系。试验结果表明:(1)适宜水胶比能够使浆体稳定性提高,最佳水胶比0.25,初始流动度146 mm,28 d抗折强度6.64 MPa,28 d抗压强度26.97 MPa。(2)保水增稠剂改善砂浆泌水及提高均匀度,最佳掺量0.65 g时,砂浆黏度值为1 275 m Pa·s;乳胶粉决定拉伸黏结强度,最佳掺量4.5 g时,拉伸黏结强度值达到1.56 MPa。(3)最佳胶凝材料体系为水泥∶矿渣粉∶粉煤灰∶石膏=340 g∶30 g∶30 g∶30 g,流动度更高,强度不减弱,综合性能指标更优。In order to improve the shortcomings of low construction efficiency,poor self leveling effect,and low fluidity caused by tradi-tional concrete surface leveling application of mortar,the experimental study focuses on ultra-high performance water mud based self lev-eling mortar.Determine the optimal water cement ratio through water cement ratio testing.Single factor experimental study on the effects of admixtures on the fluidity,strength,viscosity,and other properties of mortar.Research on the comprehensive impact of a multi-component cementitious material system on the performance of mortar and determine the optimal mix system.The experimental results show that(1)An appropriate water cementratio can improve the stability ofthe slurry.The optimal water cement ratio is 0.25,with an initial flowability of 146 mm,a flexural strength of 6.64 MPa at 28 days,and a compressive strength of 26.97 MPa at 28 days.(2)The water retaining thickener improves the bleeding and uniformity of mortar.When the optimal dosage is 0.65 g,the viscosity value of mortar is 1275 mPa's.Latex powder determines the tensile bonding strength,and when the optimal dosage is 4.5 g,the tensile bonding strength value reaches 1.56 MPa.(3)The optimal cementitious material system is cement:mineral powder:fly ash:gypsum=340 g:30 g:30 g:30 g,with higher fluidity,no weakening of strength,and better comprehensive performance indicators.

关 键 词：超高性能 水泥基自流平砂浆 水胶比 外加剂 胶凝材料体系 

分 类 号：TU528.01[建筑科学—建筑技术科学]