砂浆流变参数的Marsh筒法和微坍法测定  

Determination of Rheological Parameters of Mortar by Using Marsh Cone Method and Mini-slump Method

作　　者：李京军 谭德林[1] 牛建刚 LI Jingjun;TAN Delin;NIU Jiangang(School of Civil Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China;College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;Inner Mongolia Autonomous Region Key Laboratory of Civil Engineering Safety and Durability,Baotou 014010,Inner Mongolia,China)

机构地区：[1]内蒙古科技大学土木工程学院,内蒙古包头014010 [2]重庆大学材料科学与工程学院,重庆400044 [3]内蒙古自治区土木工程安全与耐久重点实验室,内蒙古包头014010

出　　处：《材料导报》2022年第9期98-104,共7页Materials Reports

基　　金：国家自然科学基金(51968058);内蒙古自治区自然科学基金(2020BS05020,2021MS05058);内蒙古自治区高等学校科学技术研究项目(NJZY20097);内蒙古科技大学建筑科学研究所开放基金(JYSJJ-2021Q04);内蒙古科技大学创新基金(2019QDL-B50);内蒙古科技大学攀登计划(XZ-TJ-01)。

摘　　要：流变仪常被用于测定砂浆的流变参数,但因设备、试验参数等差异,不同设备的测试结果不具可比性。基于此,本工作提出了两种简便且实用的砂浆流变参数测定方法,即Marsh筒法和微坍法,并对比分析了这两种方法的适用性。结果表明,砂浆流变模型的选取与测试方法有关,对于Marsh筒法,宜选用H-B模型;对于微坍法,宜选用宾汉姆模型。Marsh筒法的试验结果受砂浆自身重力和惯性力的影响作用较大,导致砂浆的塑性粘度离散性大;而微坍法的试验结果离散性小,可重复性高,可有效减小砂浆自身重力和惯性力的影响作用,更适用于测试砂浆流变参数。Rheometer was often used to determine the rheological parameters of mortar,but due to the differences in equipment and test parameters,the test results of different equipment were not comparable.Based on this,this work put forward two simple and practical methods for measu-ring the rheological parameters of mortar,i.e.,marsh cone method and mini-slump method,and compared and analyzed the applicability of these two methods.The results showed that the selection of rheological model was related to the test method,and the H-B model was suitable for the marsh cone method and the Bingham model for the mini-slump method.The test results of marsh cone method were greatly affected by the gravity and inertia force of mortar,which led to the large discreteness of mortar plastic viscosity.However,the test results measured by using mini-slump method had small discreteness and high repeatability,which could effectively reduce influence of mortar gravity and inertial force,and this method was more suitable for testing mortar rheological parameters.

关 键 词：流变参数 砂浆 MARSH筒法 微坍法 

分 类 号：TU528.01[建筑科学—建筑技术科学]