The Study On The High Compatibility Grouting Agent

Duct grouting is the last step of Post-tensioned construction, but it is the key step which influences the pre-stressed steel playing its role and protects the pre-stressed steel. The quality of the duct grouting directly affects the safe use of the pre-stressed member. So related national standards strictly control the grouting process, but also put forward more strict requirements about the quality of the grouting agent(material). It is of great practical significance which we developing and mastering grouting agent preparation technology, because the great difficulty of developing it, and less research and high market price.“Technical Specification for Construction of Highway Bridge and Culvert”-JTG/T F50-2011 is issued by Transportation Department. According it in the requirement of grouting agent, the research main tests liquidity, stability, strength, micro-expansion. By conducting a lot of test, the study analyzes of the effect of each composition, then obtain the basic composition: Water reducing dispersion components, stable components, expansion component in plastic phase, expansion components in hardening phase. Analyzing of the effects of the various components on the properties of cement pastes, it determines the suitable dosage range of the various components.After respectively determined the suitable dosage range of each component, four factors three levels orthogonal table is selected, then in the orthogonal experiment the main four performances are surveyed. The function of each composition under the effect of multiple factors is analyzed, then obtain the best matching. By this orthogonal experiment the optimal mixing proportion of grouting agent is obtained, which is plastic expansive agent: water reducing agent: mineral stable component: CSA expansive agent = 1:20:250:300.