scholarly journals Experimental study of the effect of water to cement ratio on mechanical and durability properties of Nano-silica concretes with Polypropylene fibers

2017 ◽  
Vol 0 (0) ◽  
pp. 0-0 ◽  
Author(s):  
Kamal Rahmani ◽  
Mohsen Ghaemian ◽  
Abbas Hosseini
Keyword(s):  
Experimental Study ◽  
Polypropylene Fibers ◽  
Nano Silica ◽  
Cement Ratio ◽  
Durability Properties ◽  
Effect Of Water ◽  
Water To Cement Ratio

Effect of Colloidal Nano-Silica on the Mechanical and Durability Performances of Mortar

2014 ◽  
Vol 629-630 ◽  
pp. 443-448 ◽  
Author(s):  
Hong Jian Du ◽  
Sze Dai Pang
Keyword(s):  
Compressive Strength ◽  
Drying Shrinkage ◽  
Pozzolanic Reaction ◽  
Nano Silica ◽  
Cement Ratio ◽  
Durability Properties ◽  
Cement Mortars ◽  
Water To Cement Ratio ◽  
Water Sorptivity ◽  
Mixing Water

s. The mechanical and durability properties of cement mortars with colloidal nanosilica (CNS) were investigated experimentally. Reference mortar with a low water-to-cement ratio of 0.30 was used in this study. The influence of CNS was evaluated by adding 0.5, 1.0, 1.5 and 2.0% of CNS by weight of cement. CNS was first stirred in the mixing water for 2 minutes before added to cement and sand. Superplasticizer was used to maintain the same flowability. Results showed that the compressive strength consistently increases with higher dosage of CNS at all the curing ages, due to both hydration acceleration and pozzolanic reaction. With the increase in CNS, the migration coefficient and water sorptivity consistently decreased; with 2% of CNS, the migration coefficient and water sorptivity were reduced by 45% and 30% respectively in comparison with the reference mortar. The improved durability could be explained by the reduction and refinement in the porosity, which can be attributed to nanofiller effect and pozzolanic reaction of nanosilica. Furthermore, the addition of CNS could reduce the drying shrinkage by densifying the microstructure in the cement paste, which has not been reported previously.

The Analysis of Influence Factors in Cement Strength Test

2017 ◽  
Vol 726 ◽  
pp. 23-27
Author(s):  
Xiao Bo Yan ◽  
Xu Fang Wang ◽  
Chan Gan Wang
Keyword(s):  
Experimental Study ◽  
Influence Factors ◽  
Strength Test ◽  
Experimental Results ◽  
Test Accuracy ◽  
Cement Ratio ◽  
Water To Cement Ratio ◽  
Vibrating Table ◽  
Cement Strength ◽  
Test Result

A broad experimental study had been carried out to characterize the effects of personnel operation and apparatus on cement strength test in this paper. The experimental results illustrated that wipe method of bowl influenced cement strength test result through changing water to cement ratio. In addition, cement strength results compacted by vibrating table were lower than that compacted by jolting apparatus. Also, it found that the installation way of jolting apparatus and the conditions of clamps had a significant effect on cement strength test result. Moreover, the use of ejector would reduce specimens’ damage in the demolding process, which ensured cement strength test accuracy.

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