Influences of polymers on the properties of cement-sodium silicate grouts with a high water-binder ratio
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This study investigates the influence of redispersible latex powder and hydroxy propyl methyl cellulose on the physical andmechanical properties of cement-sodium silicate grouts with a high W/B ratio. The rheological properties, setting time,compressive strength, autogenous shrinkage sulfate attack resistance and permeability of the grouts were assessed andcompared. The microstructures were investigated in terms of crack development. The results show that satisfactory propertiesand durability, such as an initial setting time extension of 20~55%, an autogenous shrinkage reduction of 0.332~1.21‰, anda permeability addition of 0.1–0.4 MPa, were obtained in cement-sodium silicate grouts with the addition of two polymers. Theflexural strength of cement-sodium silicate grouts with redispersible latex powder was improved after curing in water andsulfate attack by 3 wt% sodium sulfate. However, the addition of two polymers reduced the compressive strength of all groutsexcept for the redispersible latex powder content of 3%. These research results can provide a technical reference for groutingmaterial selection and mixing ratio adjustment.
Abstract
This study investigates the influence of redispersible latex powder and hydroxy propyl methyl cellulose on the physical andmechanical properties of cement-sodium silicate grouts with a high W/B ratio. The rheological properties, setting time,compressive strength, autogenous shrinkage sulfate attack resistance and permeability of the grouts were assessed andcompared. The microstructures were investigated in terms of crack development. The results show that satisfactory propertiesand durability, such as an initial setting time extension of 20~55%, an autogenous shrinkage reduction of 0.332~1.21‰, anda permeability addition of 0.1–0.4 MPa, were obtained in cement-sodium silicate grouts with the addition of two polymers. Theflexural strength of cement-sodium silicate grouts with redispersible latex powder was improved after curing in water andsulfate attack by 3 wt% sodium sulfate. However, the addition of two polymers reduced the compressive strength of all groutsexcept for the redispersible latex powder content of 3%. These research results can provide a technical reference for groutingmaterial selection and mixing ratio adjustment.
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