钢纤维喷射砂浆力学性能与流动度多因素正交试验分析  

Multi-Factor Orthogonal Test Analysis of Mechanical Properties and Fluidity of Steel Fiber Sprayed Mortar

作　　者：潘慧敏[1] 张昊[1] 李梦谊 谢少康 赵庆新[1] PAN Huimin;ZHANG Hao;LI Mengyi;XIE Shaokang;ZHAO Qingxin(Hebei Province Engineering Research Center for Harmless Synergistic Treatment and Recycling of Municipal Solid Waste,Yanshan University,Qinhuangdao 066004,China)

机构地区：[1]燕山大学,城市固废无害化协同处置及利用河北省工程研究中心,秦皇岛066004

出　　处：《硅酸盐通报》2024年第2期466-477,共12页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51608469,52078450)。

摘　　要：为探究基体因素对钢纤维喷射砂浆力学性能和流动度的影响,基于正交试验方法对砂浆试件进行了力学性能和流动度测试。结果表明:砂胶比(A)对劈裂抗拉强度的影响较大,对7 d抗压强度有一定的影响,对后期抗折强度影响特别显著;钢纤维掺量(B)对劈裂抗拉强度、前期抗折强度和前中期抗压强度的影响分别为特别显著、显著和不显著;速凝剂掺量(C)对7 d前抗压强度、中后期劈裂抗拉强度影响显著;粉煤灰掺量(D)仅对后期抗压强度的影响显著;前述四种因素掺量对流动度的影响均不显著。由层次分析法得到对抗压强度、抗折强度、劈裂抗拉强度和流动度改善效果最佳的配合比分别为A1B3C3D1、A3B3C1D2、A3B3C3D1、A2B1C1D3,由功效系数法得到综合最佳配合比为A2B3C1D2。钢纤维在基体中起桥接与锚固加强的作用,速凝剂在水化过程中消耗大量的Ca(OH)_(2)并生成钙矾石,促使喷射砂浆早期强度迅速提升。In order to explore the influence of matrix factors on the mechanical properties and fluidity of steel fiber sprayed mortar,the mechanical properties and fluidity of mortar specimens were tested based on orthogonal test method.The results show that the ratio of sand to cement(A)has a great influence on the splitting tensile strength,and has a certain influence on 7 d compressive strength,and has a particularly significant effect on later flexural strength.The influence of steel fiber content(B)on splitting tensile strength,early flexural strength and early and middle compressive strength is particularly significant,significant and insignificant,respectively.The content of accelerator(C)has a significant effect on compressive strength before 7 d and the splitting tensile strength in middle and late stages.The content of fly ash(D)has significant influence on compressive strength in late stage.The four factors have no significant influence on fluidity.The optimal mix ratio of compressive strength,flexural strength,splitting tensile strength and fluidity are obtained by analytic hierarchy process as A 1B 3C 3D 1,A 3B 3C 1D 2,A 3B 3C 3D 1,A 2B 1C 1D 3,and the optimal mix ratio is obtained by efficiency coefficient method as A 2B 3C 1D 2.The steel fiber plays a bridging and anchoring strengthening role in matrix.During the hydration process,the accelerator consumes a large amount of Ca(OH)_(2) and generates ettringite,which is the main reason for the rapid increase in early strength of sprayed mortar.

关 键 词：喷射砂浆 钢纤维 正交试验 功效系数法 微观分析 

分 类 号：TU528.58[建筑科学—建筑技术科学]