低速搅拌下高水胶比压浆料的制备及其性能研究

Study on Preparation and Properties of High Water-Binder Duct Grouts Under Low-speed Stirring

研究了低速搅拌、高水胶比下,减水剂、硅灰、粉煤灰及膨胀剂对压浆料的流动性、泌水率以及抗压强度等性能的影响规律,在此基础上优化了配合比,制备了普通低速搅拌下高水胶比压浆料。试验结果表明,在转速低于300 r/min、0.42高水胶比情况下,可以制备出初始流动度为25.5 s、不泌水、各项性能均满足实际工程应用要求的预应力孔道压浆材料。该制备技术在简化施工工艺的同时降低材料成本约231元/吨,对促进预应力孔道压浆材料的技术改进具有重要的意义。

The effects of high water-binder ratio,water reducing agent,silica fume,fly ash and expansion agent on the flowability,water bleeding rate and compressive strength of duct grouts under low-speed stirring were studied.On this basis,the mix proportion was optimized to prepare a high water-binder ratio duct grouts under ordinary low-speed stirring.The results show that under low-speed stirring at a speed lower than 300 r/min and a high water-binder ratio of 0.42,a prestressed channel grouting material with an initial fluidity of 25.5 s,no bleeding and performance that meets the requirements of practical engineering applications can be prepared.This preparation technology reduces the material cost by about 231 yuan/t while simplifying the construction process,which is of great significance to the technical improvement of the prestressed channel grouting material.