The Research On HG Rehabilitating And Improving The Performance Of Cement Mortar

Cement-based Materials are main materials of modern building.However, the performance of a large number of Cement-based Materials descends because of the matter of the raw materials, the mix ratio, molding and curing in course of construction and the factors of weather, construction and use conditions, etc.It influences strictly the use performance and life-span of buildings.So, it is quite significative that the rehabilitation and improvement research on molded buildings and wares made up of Cement-based Materials. In this thesis, several representative samples of cement mortar made in lab and in spot act as research objects.Firstly, the experimentation on their surfaces treated by fluoride-based HG liquid is carried.By comparing treated and untreated mortars, the effect on anti-abrasion and other mechanical strengths such as compressive strength, bending strength and adhesion strength is studied.Secondly, the effect on compressive strength and bending strength of mortars by mixing HG into stuff and the curing effect on mortars using HG liquid as curing agent are studied.Finally, by microcosmic test and analyse such as XRD, SEM and EDAX, the mechanism that HG influences on the performance and the structure of mortars is discussed. The results show that anti-abrasion, compressive strength, bending strength and adhesion strength of mortars treated by HG increase on a certain extent, especially, anti-abrasion and adhesion strength. For instance, the increase percentage of anti-abrasion of mortars with cement sand ratio 1 to 4 and 1 to 5 is about 37 to 42, according as the bulk of grinding dish.The experimentation shows that, mixing proper amount of HG into stuff and using HG as curing agent, the performance of mortars is improved on a certain extent.The microcosmic test and analyze shows that the mechanism that HG influences on the performance and the structure of mortars is chemical reactive strengthening.A number of indiscerbtible resultants come into being in holes of mortars after HG reacts to Ca(OH)2 consisting in mortars.Thus, mortars get close-grained.Naturally, the anti-abrasion and the strength of mortars increase.Moreover, the mortars with close-grained structure are able to reduce evaporation of water in mortar and prevent lye in mortar streaming by holes in mortar.It is favorable to cure mortars and prevent scumming on the surface of mortar. It will provide a convenient, applied and potential measure to rehabilitate and cure buildings and wares made up of Cement-based Materials in architecture.