Seawater erosion epoxy grout

Can resist erosion of epoxy grout high-strength non-shrinkage epoxy grout epoxy grout 'sea workers', is a kind of can resist various salts in seawater erosion of epoxy grout material, mainly used in harbor, wharf, bridge approach, prevent contact with seawater and sea dike construction projects in the epoxy grout artifacts. Water of the main damage of epoxy grout water contains more soluble salts, the main salt with NaCl and Na2SO4, MgSO4. The presence of these salts of epoxy grout contact with the sea will have the following two kinds of damage. Sulphate corrosion effect of Na2SO4, MgSO4 sulfate and the hydration products of cement in the epoxy grout Ca ( 哦) 2 generate CaSO4 reaction. And CaSO4 rapidly with the solid hydrated calcium aluminate cement ( Such as 4 cao, Al2O3, 12 h2o) Type and generate high sulphur hydrated calcium sulphoaluminate ( The ettringite) 。 Generate ettringite, solid phase volume is the original one. More than 5 times, because it is in the curing of epoxy grout reaction, thus formed by epoxy grout epoxy grout structure caused by the expansion stress damage. Chlorine salt corrosion in the seawater NaCl, MgCl2 and the hydration products of cement Ca ( 哦) 2, generated CaCl2, Mg ( 哦) 2, etc. Due to the solubility of CaCl2 than Ca ( 哦) 2, generated CaCl2 quickly dissolved in sea water, the reaction may be to generate CaCl2 direction. Combined with the generated Mg ( 哦) 2, is a kind of gel material so that also can make epoxy grout structure damage. Cl - in the sea Such as seeping into the internal contact with the reinforcement of reinforced epoxy grout will cause the serious erosion of steel not only reduces the reinforced epoxy grout to strengthen, reinforcement corrosion generated after Fe ( 哦) 2, FeCl3 product will also damage due to the expansion of epoxy grout structure. 3. Water level fluctuation area of epoxy grout freeze-thaw damage, water scouring abrasion of epoxy grout component, epoxy grout in the cement hydration products in the seawater corrosion is has a great influence for the durability of epoxy grout. Seawater epoxy grout technology requirements 1. Corrosion resistance ( 1) The resistance to sulfate corrosion ( 2) Resistance to chlorine ion corrosion 2. The frost resistance of 3. Marine reinforced epoxy grout reinforced protective layer thickness in 4. Seawater epoxy grout in the maximum allowable crack epoxy grout once appear larger crack, even if the epoxy grout coating is very compact, H2O, O2, Cl - in the sea water Erosion medium also can smoothly reach the surface of the reinforcement of cracks, the crack of steel bar corrosion intensifies, the coagulation - concrete cracks Reinforcement corrosion - Epoxy grout cracking 'cycle will be more serious, flake epoxy grout, is bound to cause crack epoxy grout with a lower compressive force of steel. Thus endanger the durability and safety of the structure. Marine epoxy grout material selection, 1) Cement is the key to the preparation of seawater epoxy grout materials. Should choose as far as possible in the hydration products Ca ( 哦) 2, less hydration aluminate cement. If it is in the water level change, consider frost resistance, abrasion resistance and shrinkage of cement stone. Comprehensive above requirement, can choose C3A content less than 6% of heat or DAMS low-heat Portland cement or Portland cement dam. Optional also choose slag content is not less than 50% of the slag Portland cement. Content is not less than 50% of the slag silicate cement DAMS have stronger resistance to corrosion, sulfate and chloride salt can be used in the water below the surface, but the frost resistance is poorer, unfavorable change at in the water area. （ 2) Aggregate should be hard aggregate, cleaning, grading is good. Special attention should be paid to is, preparation of seawater epoxy grout coarse aggregate shall not contain active SiO2, in order to prevent the alkali aggregate reaction and. （ 3) Mixing water cannot be prepared with water as seawater epoxy grout mixing water, and should adopt the river water, groundwater, or urban water supply system. （ 4) Admixtures can need according to engineering using water reducing agent, early strength agent and antifreeze additive, etc.