Experimental Study Of The Damp Disease For Masonry Building

Masonry building has a long history, large variety and wide geographical distribution. Due to the impact of building climate environment, technique of masonry, human and biological activities, a lot of masonry buildings have varied degrees of damp disease phenomenon. Damp diseases evidently affect the appearance of the building, interferes with the comfort of the users and occupants, shortens the life of the building, and also may be a threat to the preservation of heritage buildings and related artifacts. Therefore, research on damp disease for masonry building is urgent.The experimental method is an effective technique to explore disease mechanism for building damp. The main experiment of this study consist of the basic experiment and comprehensive experiment. The basic experiment to the sintered clay brick and lime-sand brick as the main object of the study, records the characteristics of damp and efflorescence disease of the both in the laboratory environment. The main object of comprehensive experiment are brick walls which are consist of lime mortar and cement mortar build with sintered clay brick respectively. It records the characteristics of damp and efflorescence disease of the brick walls. Through the experimental studies, this paper try to explore the mechanism for damp disease and the role of different building mortar in damp disease.This paper can be divided into seven chapters:The first chapter introduces the motivation of the study, the study’s purpose and meaning, object and scope, methods and steps as well as research of the field in China and abroad. Provide background and theoretical support for the follow-up research.The second chapter introduces the basic theory and field research on building damp disease problem. It illustrates the water sources of building and damp disease types, introduces the damp disease research method and classification system, puts Zhaiyage Stadium and Residential of No.6, Yiyuan Road as field research object. And these can provide an important reference for subsequent experimental design.The third chapter through effective experimental design and experimental process, Qualitative analyses experimental phenomena of clay brick and lime-sand brick. And than it quantitative analyses the moisture content changes and the surface temperature distribution of the bricks. And a comparative analysis of the two bricks damp.The fourth chapter through further experimental design and experimental process, Qualitative analyze experimental phenomenas of lime clay brick wall and cement clay brick wall. Quantitative analyze the moisture content changes of the walls. Based on this, it draws a comparative analysis of damp process and the surface temperature distribution of the two masonry brick walls.The fifth chapter base on the basic experiment and the comprehensive experiment, discusses on mechanism of damp for masonry buildings, explores the role played of the building mortar in damp disease problems in the masonry brick wall. It compare the damp and efflorescence degree of the lime clay brick wall and cement clay brick wall in laboratory environmental conditions. Then it analyses damp rates of the clay bricks and sand-lime brick, and the growth mode of efflorescence of sand-lime brick.The sixth chapter links theory with practice, on the basis of the experimental study conclusions, explores moisture-proof strategy on the directions of impermeable moisture-proof and cavity ventilation.The main achievement of this study is that it explores the role played of the building mortar in damp buildings, achieves the growth mode of efflorescence, perfects field investigation procedures and methods. It provides a reference for the selection of building materials, and provides theoretical reference and technical support for works of resistance to moisture.