What is the impact strength of grouting materials

CGM high-strength non-shrinkage grouting material strength of grouting material strength depends on the grouting material of mortar and interface transition zone between coarse aggregate and intensity. Interface transition zone in CGM high-strength non-shrinkage grouting material is the weakest link, damage was often sends in the interface transition zone, makes the mortar and the strength of the coarse aggregate is not fully shipments. Transitional zone, combined with weak key, on the other hand, the cement hydration and the volume change and grouting material mixing at bleeding and segregation are produced when the interface transition zone is very weak. That is generally considered to be the aggregate surface 50 um thickness range of interface transition zone, transition zone, high porosity and permeability is strong, the main enrichment of orientational calcium hydroxide crystal and a small amount of C - S - H gel and ettringite. When the water cement ratio more than 0. 4 ( Water cement ratio of 10 - my company 13%) , the influence of interface transition zone on grouting material particularly significant. After adding silica fume in the grouting material, particle size distribution more uniform, the cohesive strength between matrix and aggregate stronger, grouting material viscosity change makes the interface transition zone, increase strength, thickness thinning. Common grouting material stress damage occur on the boundary between aggregate and cement, because these areas there are often many pores, gap and potential micro structure defects such as cracks, water is the weakest link in grouting material. The cement strength grade and the influence of water-cement ratio on strength of grouting material. Cement grouting material of active component, the strength of a direct impact on the size of the strength of grouting material. Jade wall building materials surface; Used in the case of the same mixture ratio, the higher the concrete strength grade, and the higher the strength of the grouting material; In cement varieties, at constant level, the strength of the grouting material mainly depends on water cement ratio. The combined water necessary for cement hydration, generally accounts for only about 23% of the cement quality, but when mixing grouting material mixing content, in order to obtain the necessary liquidity, often need more water, water to cement ratio is larger. When grouting material hardening, excess water residue in the grouting material, form blisters or waterway, evaporation with grouting material hardening after leaving the pore, thereby reducing the real effective area of the grouting material loading, and grouting material stress, may cause stress concentration around the pore. Therefore, in the cement strength grade of the same circumstances, the greater the water cement ratio, the more excess water, strength of grouting material is lower; Whereas the higher the strength of grouting material. But it must be pointed out that if too little water mixing things too hard, under the condition of a certain construction, there is no guarantee that grouting material can be fully compacted, grouting material will appear more cellular, holes, has led to the decrease of the strength of grouting material seriously.