scholarly journals Prediction of Drying Shrinkage Cracks of Steel Chip Reinforced Polymer Cement Mortar

2016 ◽  
Vol 14 (12) ◽  
pp. 739-752 ◽  
Author(s):  
Yuika Ida ◽  
Sunhee Hong ◽  
Shinya Kimura ◽  
Yuichi Sato ◽  
Yoshio Kaneko
Keyword(s):  
Cement Mortar ◽  
Drying Shrinkage ◽  
Shrinkage Cracks ◽  
Reinforced Polymer ◽  
Steel Chip

Experimental Study on Bond Behavior of GFRP-to-Cement Mortar

2011 ◽  
Vol 94-96 ◽  
pp. 543-546
Author(s):  
Ning Zhang ◽  
Ai Zhong Lu ◽  
Yun Qian Xu ◽  
Pan Cui
Keyword(s):  
Aluminium Alloy ◽  
Cement Mortar ◽  
Bond Stress ◽  
Reinforcing Bars ◽  
Bond Performance ◽  
Gfrp Bars ◽  
Pull Out ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Average Bond

Direct pull-out tests were performed to evaluate the bond performance of glass fiber-reinforced polymer (GFRP) reinforcing bars in cement mortar. Specimens with different bar diameters and different grouted lengths (i.e., 5d, 10d and 15d, d is the diameter of bars) are prepared for the pull-out tests. For comparison, specimens with plain aluminium alloy bars (AAB) were tested as well. The result shows that the average bond stress between plain aluminium alloy bars and cement is much smaller than that between the deformed GFRP bars and cement; thin GFRP bars tended to have larger average bond stress; the shorter the grouted length, the smaller the maximum average bond stress. Only part of grouted length undertakes the bond stress and the length depends on the shear modulus of GFRP and the surrounding material.

Effects of triethanolamine on autogenous shrinkage and drying shrinkage of cement mortar

2021 ◽  
Vol 304 ◽  
pp. 124620
Author(s):  
Hui Liu ◽  
Hui Lin ◽  
Xiaoyong Liu ◽  
Jian Wang ◽  
Xiaofan Pang ◽  
...  
Keyword(s):  
Cement Mortar ◽  
Autogenous Shrinkage ◽  
Drying Shrinkage

Research on Polymer Latex Modify Comprehensive Properties of Cement Mortar

2011 ◽  
Vol 225-226 ◽  
pp. 457-460
Author(s):  
Wei Li
Keyword(s):  
Mechanical Properties ◽  
Cement Mortar ◽  
Drying Shrinkage ◽  
Mix Design ◽  
Cement Ratio ◽  
Comprehensive Properties ◽  
Before And After ◽  
Overall Performance ◽  
Styrene Butadiene ◽  
Polymer Latex

Aimed for current situation that most scholars concerned with mechanics, deformation, flow performance of modified cement mortar, the paper selected carboxyl styrene-butadiene latex as the modified material, researched on cement mortar’ water reducing effect, wear resistance, corrosion resistance-mechanical properties, drying shrinkage before modifing and after modifing. Compared cement fine mortar’s properties with cement mechine-made mortar’s properties before and after modification. Research results showed that the addition of carboxyl SB latex, the overall performance of cement mortar is greatly improved, and with the increase of polymer cement ratio, this improvement trend is more obvious, those changes especially are suitable for extra-fine cement mortar. The results clarify the properties variation law of cement mortar before and after modification, this provides scientific guidance for polymer latex modified cement mortar mix design.

scholarly journals SIZE EFFECT ON THE ULTIMATE DRYING SHRINKAGE OF CEMENT MORTAR: 1-YEAR EXPERIMENT AND NUMERICAL MODELING

2021 ◽  
Vol 30 ◽  
pp. 1-6
Author(s):  
Lenka Dohnalová ◽  
Petr Havlásek ◽  
Vít Šmilauer ◽  
Pavel Reiterman ◽  
Vendula Davidová
Keyword(s):  
Size Effect ◽  
Cement Mortar ◽  
Drying Shrinkage ◽  
Small Scale ◽  
First Year ◽  
Design Codes ◽  
Laboratory Measurements ◽  
Short Term ◽  
Dependent Behavior ◽  
Creep And Shrinkage

The magnitude and time evolution of shrinkage are influenced by numerous factors which are implemented in the design codes often in a different way. The time-dependent behavior of concrete in structures sensitive to creep and shrinkage should be verified by means of short-term laboratory measurements. Extrapolation of drying shrinkage from short-term measurements is an illposed problem. The process is extremely slow but can be accelerated by reducing the specimen size. The knowledge of the size-effect on drying shrinkage is a necessity to establish the transition from the laboratory to the structural size. In the literature, the experimental data on such size-effect are insufficient. For this reason a new experiment was developed to study this phenomenon on small-scale specimens made of cement mortar and the results from the first year are summarized in this paper. The measured data are validated by coupled FEM hygro-mechanical simulations.

scholarly journals Predicting the drying shrinkage behavior of high strength portland cement mortar under the combined influence of fine aggregate and steel micro fiber

2017 ◽  
Vol 67 (326) ◽  
pp. 119 ◽  
Author(s):  
Zhengqi Li
Keyword(s):  
Compressive Strength ◽  
Portland Cement ◽  
Cement Mortar ◽  
Drying Shrinkage ◽  
High Strength ◽  
Fiber Content ◽  
Fine Aggregate ◽  
Aggregate Content ◽  
Normal Strength ◽  
Gardner Model

The workability, 28-day compressive strength and free drying shrinkage of a very high strength (121-142 MPa) steel micro fiber reinforced portland cement mortar were studied under a combined influence of fine aggregate content and fiber content. The test results showed that an increase in the fine aggregate content resulted in decreases in the workability, 28-day compressive strength and drying shrinkage of mortar at a fixed fiber content. An increase in the fiber content resulted in decreases in the workability and drying shrinkage of mortar, but an increase in the 28-day compressive strength of mortar at a fixed fine aggregate content. The modified Gardner model most accurately predicted the drying shrinkage development of the high strength mortars, followed by the Ross model and the ACI 209R-92 model. The Gardner model gave the least accurate prediction for it was developed based on a database of normal strength concrete.

scholarly journals Prediction of Drying Shrinkage Cracking of Steel Chip Reinforced Cementitious Composite Considering Tensile Creep

2015 ◽  
Vol 64 (8) ◽  
pp. 628-633
Author(s):  
Shinya KIMURA ◽  
Sunhee HONG ◽  
Daiki TANAKA ◽  
Yuichi SATO ◽  
Yoshio KANEKO
Keyword(s):  
Drying Shrinkage ◽  
Tensile Creep ◽  
Cementitious Composite ◽  
Shrinkage Cracking ◽  
Steel Chip

Study on the Properties of Fiber Reinforced Sulphoaluminate Cement Mortar

2012 ◽  
Vol 446-449 ◽  
pp. 1071-1075
Author(s):  
Zheng Mao Ye ◽  
Qin Yi Wu ◽  
Peng Du ◽  
Xin Cheng
Keyword(s):  
Compressive Strength ◽  
Mass Fraction ◽  
Mechanical Performance ◽  
Cement Mortar ◽  
Wood Fiber ◽  
Polypropylene Fiber ◽  
Drying Shrinkage ◽  
Moisture Loss ◽  
Shrinkage Ratio ◽  
Sulphoaluminate Cement

The effects of wood fiber and polypropylene fiber on the mechanical performance, drying shrinkage and moisture loss of sulphoaluminate cement (SAC) mortar were studied. The experimental results show that wood fiber and polypropylene fiber can both improve the flexural strength of the mortar and reduce drying shrinkage ratio and moisture loss at different ages. Polypropylene fiber can also improve the late compressive strength of the mortar. Adding 0.3% mass fraction of wood fiber, the drying shrinkage ratio and moisture loss of the motar reach minimum values. The drying shrinkage ratio reduces to 0.029% at 28d. Moisture loss reduces to 0.4%. Adding 0.5% mass fraction of polypropylene fiber, the drying shrinkage ratio and moisture loss of the motar also reach minimum values. The drying shrinkage ratio reduces to 0.03% at 28d and moisture loss reduces to 0.39%.

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