Effect of joint mortar on the bonding and chloride ion permeability performance of construction joints
XIA Qiang
CHEN Jian
LIU Xingrong
Abstract：Construction joint is the weak part of engineering structure and is prone to damage like leakage and steel corro-sion.In this paper,a novel polymer modified joint mortar was designed,and the influence of joint mortar on the adhesive splitting tensile strength and chloride ion penetration performance between new and old concrete under different pouring time intervals and different interface states was studied.The results showed that the compressive strength and flexible strength of mortar gradually de-creased with the increase of pure propyl emulsion.And the ratio of compressive strength to flexible strength gradually decreased in-dicating the addition of pure propyl emulsion could improve the toughness of mortar.The roughness of joint interface and the pour-ing time interval between new and old concrete had great influence on the adhesive splitting tensile strength and chloride ion per-meability coefficient.Under the same conditions,the adhesive splitting tensile strength and chloride ion penetration resistance of construction joint interface could be significantly improved by using joint mortar.
Keywords：joint mortarpouring time intervalinterface stateadhesive splitting tensile strengthinterface chloride ion perme-ability coefficient
Publication Date：2023-12-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 38-42 )