The Research On Polymer Modified Mortars For Waterproof And Anticorrosive

Polymer modified cement (PMC) mortars have been used widely to meet the higher special performance requirements of building materials. Polymer modified waterproof mortars take a large proportion in (PMC) mortars. Long-term salt corrosion has rarely been considered in engineering application of waterproof material including waterproof polymer modified mortars. It is necessary to modify mortar with higher physical performance, more compact and corrosion resistance through the formation of interpenetrating network structure between cement mortar and emulsion.In this paper, the performance of C3styrene-acrylic emulsion modified waterproof mortar has been studied. The main results are as follows.1. A kind of polymer modified waterproof and anticorrosive mortar, that is, C3styrene-acrylic emulsion modified42.5sulphoaluminate cement mortar, is prepared. This product can be used in waterproof and anticorrosive engineer which contacts water with high mineralization, such as, water containing lot of SO42-、Na+、NO3-、NH4+、Cl-、CO32-ions.2. The water reducing rate of C3emulsion increases with the increase of C3emulsion content from0-40%.40x40mm stretching adhesive strength, compressive strength, impermeability pressure,70×70mm shear adhesive strength increase firstly and then decrease with the increases of C3content. The suitable quantity of C3emulsion in anhydrous calcium aluminosulphate is25%and C3emulsion modified anhydrous calcium aluminosulphate will lead to a dense structure. The C3pH can affect physical performance of cement mortar. When C3pH varies from4.13to7.30, initial setting time and final setting time decrease firstly and then increase, while compressive and flexure strengths density and flowability of sulphoaluminate cement mortar increase firstly and then decrease. The results show that5.04is the most suitable C3pH.3. Impermeability pressure of C3styrene-acrylic emulsion modified cement mortar increases with the increase of defoaming agent content from0to0.6%and decreases with the increase of emulsifier content. Compressive strength decreases and flexure strength increase firstly and then decrease with the increase of C3content when C3content varies from20%to40%. Setting time decreases and flowability increases with the increase of C3content. Appropriate sand gradient can favor the compressive and flexure strengths of C3emulsion modified sulphoaluminate cement mortars.4. Impermeability pressure, density, compressive and flexure strengths decrease with the increase of water addition when water addition vary from0.14to0.22. The suitable water addition is0.16.The stirring rate can influence the strength of C3emulsion modified cement mortar. With the decreases of stirring rate, the compressive and Flexure strengths of mortar increase. Stirring method can affect physical performance of modified cement mortar. Compared with3min stirring method,3+3min stirring method can increase compressive and flexure strengths, density and flowability. Multiple coating help to improve mortar performance. Initial setting time and final setting time decrease with the increase of construction temperature.5. Density method is firstly created in this paper to measure relative air capacity of polymer modified cement mortar. Compared with hydraulic pressure method and air pressure method, there are many advantages such as no demand of special equipment, easy process and little sample in density method, which is suitable to be applied in test of formula optimization.