Effects of time-varying liquid bridge forces on rheological properties,and resulting extrudability and constructability of three-dimensional printing mortar  

作　　者：Peng ZHI Yu-Ching WU Timon RABCZUK 

机构地区：[1]Department of Structural Engineering,Tongji University,Shanghai 200092,China [2]Institute of Structural Mechanics,Bauhaus University of Weimar,Weimar 99423,Germany

出　　处：《Frontiers of Structural and Civil Engineering》2023年第9期1295-1309,共15页结构与土木工程前沿（英文版）

基　　金：sponsored by the National Natural Science Foundation of China (Grant Nos.52178299 and 51325802).

摘　　要：Extrudability and constructability are two important,yet contradictory issues pertaining to the construction of three-dimensional(3D)printing concrete.Extrudability is easily achieved when 3D printing cement mortar has a high water content and low cohesion,but the printed structure is easily collapsible.However,a 3D printing cement mortar with a low water content and high cohesion has a relatively stable printed structure although the cement mortar might not be extrudable.This study proposes a particle-based method to simulate 3D printing mortar extrusion and construction as an overall planning tool for building design.First,a discrete element model with time-varying liquid bridge forces is developed to investigate the microscopic effects of these forces on global rheological properties.Next,a series of numerical simulations relevant to 3D printable mortar extrudability and constructability are carried out.The study demonstrates that the effects of time-varying liquid bridge forces on rheological properties and the resulting extrudability and constructability of 3D printing mortar are considerable.Furthermore,an optimized region that satisfies both the extrusion and construction requirements is provided for 3D printing industry as a reference.

关 键 词：particle-based simulation liquid bridge force rheological property 3D printing mortar extrudability CONSTRUCTABILITY 

分 类 号：TU578.1[建筑科学—建筑技术科学]