Study on macro performance and micro-analysis of high strength grouting material

Abstract

Wind turbine duct put forward higher requirements for the performance of grouting materials. In order to obtain more economical high strength grouting materials (HSG), three kinds of low price main components, cement, quartz sand (QS) and fly ash microspheres (MS) were utilized and developed. Macro performance and micro-analysis of the HSG were conducted. The macro performance tests revealed that the mix proportion of HSG is determined as, cement: QS: MS: superplasticizer: swelling agent=80:10:10:0.3:0.12, When the water binder ratio was lower than 0.26, fluidity loss rapid increased. Thus water binder ratio is determined as 0.26. Compressive and flexural strength of the HSG exceeding 120MPa and 20MPa respectively. The HSG also showed good fluidity and homogeneity. The micro-analysis showed that a complete and continuous micro-structure was formed, interface transition zone could not be observed. XRD ang TG-DSC meant that the amount of AFt increased, on the contrary, Ca(OH)2 decreased. pore diameter of the HSG was mostly 10nm. The addition of swelling agent and MS did not changed the types of hydration products of HSG, but the pore structure was optimized. Due to the cheap components, HSG can generate higher profits at the lower price, and which perform good economic benefits and market competitiveness.