scholarly journals Developing a Polypropylene Fabric, Silica Fume, and Redispersible Emulsion Powder Cementitious Composite for Dynamic Water Environment

Polymers ◽  
2018 ◽  
Vol 11 (1) ◽  
pp. 47 ◽  
Author(s):  
Jinquan Liu ◽  
Xiaofei Li ◽  
Pooya Saffari ◽  
Qichao Liang ◽  
Ling Li ◽  
...  
Keyword(s):  
Silica Fume ◽  
Retention Rate ◽  
Water Environment ◽  
Polypropylene Fiber ◽  
Low Flow ◽  
Cementitious Composite ◽  
Cement Slurry ◽  
Gel Time ◽  
Bleeding Rate ◽  
Composite Slurry

In the dynamic water environment, grouting requires a material with higher strength and anti-washout performance to prevent groundwater inrush. This study aims to develop a dynamic water slurry by mixing polypropylene fiber (PP fiber), silica fume (SF) and the polymer material of redispersible emulsion powder (REP) to the Portland cement. Towards this aim, a series of tests, including strength, gel time, bleeding rate, fluidity, and anti-washout, were conducted to evaluate the effects of SF, PP fiber, and REP on the slurry properties. The test results show that: (1) SF displays significant effects on strength, gel time, fluidity, and bleeding rate of cement slurry. Differently, PP fiber mainly affects the stress–strain behavior of the slurry and can improve the ductility significantly. (2) By mixing SF and fiber simultaneously, the slurry strength can increase by about 30%, and its strain can extend by more than 70%. Meanwhile, the composite slurry possesses great anti-washout properties at a low flow velocity (v ≤ 0.4 m/s), and the grouting retention rate (GRR) can reach up to 98.7%. However, the GRR decreases to a maximum value of 31.3% when v = 0.6 m/s. (3) By mixing the REP into the fiber-SF composite slurry, the GRR can further increase, reaching more than 60% even when v = 0.6 m/s. As a result, the developed fiber-SF cementitious composite slurry, which when mixed with REP, presents a favorable performance in the dynamic water environment.

scholarly journals Properties of Degraded Waste PET-Modified Styrene-Acrylic Emulsions for Cement Slurry Materials

2019 ◽  
Vol 2019 ◽  
pp. 1-14
Author(s):  
Jinxi Dou ◽  
Guijin Zhang ◽  
Sufang Li ◽  
Chengyu Tian ◽  
Cunlu Ji ◽  
...  
Keyword(s):  
Water Consumption ◽  
Water Retention ◽  
Retention Rate ◽  
Setting Time ◽  
Reduction Rate ◽  
Cement Slurry ◽  
Acrylic Emulsion ◽  
Water Reduction ◽  
Setting Times ◽  
Lower Permeability

The properties of a modified cement slurry based on degraded waste PET-modified styrene-acrylic emulsions are studied. The effects of the modified styrene-acrylic emulsion on water consumption, setting time, retarding effect, water retention, impermeability, and mechanical properties of the cement slurry are comprehensively studied. The results show that the modified styrene-acrylic emulsion has the following impacts on the cement slurry: it significantly reduces the water consumption required to reach a standard consistency, slows down the initial and final setting times, and greatly improves the water retention rate and water reduction rate. When the content of modified styrene-acrylic emulsion is 7.5%, the water reduction rate is 36% and the water retention rate is 97%. The solidified cement slurry with a modified styrene-acrylic emulsion content less than 7.5% has lower permeability and higher flexural strength than a common cement slurry. The compressive strength is reduced but can still reach required values. According to SEM observations, the modified styrene-acrylic emulsion can enhance the bonding strength between the cement particles, reduce the porosity of the structure, and improve the performance of cement-based composites.

The Performance Evaluation of New Low Temperature early Strength Agent ZL-1

2013 ◽  
Vol 470 ◽  
pp. 842-846
Author(s):  
Ji Gang Wang ◽  
An Qi Tong ◽  
Zhen Zhong Fan ◽  
Qing Wang Liu
Keyword(s):  
Performance Evaluation ◽  
Low Temperature ◽  
Silica Fume ◽  
Cement Paste ◽  
Cement Slurry ◽  
Hydration Rate ◽  
Anionic Polymers ◽  
Temperature Conditions ◽  
Chlorine Ions ◽  
Early Strength

Low temperature early strength cement slurry is a slurry in order to meet the well cementation in low-temperature conditions. Daqing weather is characterized by the silica fume, solid alcohols, amines and anionic polymers prepared a certain proportion, got a new low temperature early strength agent, It can greatly accelerate the hydration rate of cement and promote the formation of the cement paste early strength; and no chlorine ions, able to overcome the problem caused by traditional chlorine early strength agent casing corrosion.

scholarly journals Effect of Undensified Silica Fume on the Dispersion of Carbon Nanotubes within a Cementitious Composite

2017 ◽  
Vol 829 ◽  
pp. 012011 ◽  
Author(s):  
S. Alrekabi ◽  
A. Cundy ◽  
Raymond L.D. Whitby ◽  
A. Lampropoulos ◽  
I. Savina
Keyword(s):  
Carbon Nanotubes ◽  
Silica Fume ◽  
Cementitious Composite

Effect of Polypropylene Fiber on Strength and Flexural Properties of Concrete Containing Silica Fume

2011 ◽  
Vol 346 ◽  
pp. 30-33
Author(s):  
Hong Wei Wang
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Silica Fume ◽  
Modulus Of Elasticity ◽  
Fiber Volume Fraction ◽  
Volume Fraction ◽  
Flexural Modulus ◽  
Polypropylene Fiber ◽  
Flexural Properties ◽  
Fiber Volume

A designed experimental study has been conducted to investigate the effect of polypropylene fiber on the compressive strength and flexural properties of concrete containing silica fume, a large number of experiments have been carried out in this study. The flexural properties include flexural strength and flexural modulus of elasticity. On the basis of the experimental results of the specimens of six sets of mix proportions, the mechanism of action of polypropylene fiber on compressive strength, flexural strength and flexural modulus of elasticity has been analyzed in details. The results indicate that there is a tendency of increase in the compressive strength and flexural strength, and the flexural modulus of elasticity of concrete containing silica fume decrease gradually with the increase of fiber volume fraction.

scholarly journals Analyzing Cement Rheological Properties Using Different Additive Schemes at High Pressure and High Temperature Conditions

2020 ◽  
Vol 39 (3) ◽  
pp. 466-474
Author(s):  
Khalil Rehman Memon ◽  
Aftab Ahmed Mahesar ◽  
Shahzad Ali Baladi ◽  
Muhannad Talib Sukar
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Rheological Properties ◽  
Silica Fume ◽  
Gel Strength ◽  
Water Quantity ◽  
Fluid Loss ◽  
Cement Slurry ◽  
Three Samples ◽  
Loss Control

The experimental study was conducted on rheological properties in laboratory to measure the integrity of cement slurry. Three samples were used and analyzed at different parameters to check the elasticity of cement slurry. Additives with various concentrations, i.e. silica fume % BWOC (Present by Weight on Cement) (15, 17, 19 and 21), dispersant % Wt (Percent Weight) (0.21, 0.26 and 0.31) and additional 1; % Wt of fluid losscontrol were used to improve the performance of the cement slurry at the temperature of 123oC. The results have shown that increase in the concentration of dispersants that have caused to decrease in the Plastic Viscosity (PV), Yield Point (YP) and GS (Gel Strength). The rheological properties of cement were improved with the addition of fluid loss control additive in 21 % BWOC (Present by Weight on Cement) silica fume increase the water quantity in cement slurry that improve its durability and to reduce the strength retrogression in High Temperature High Pressure (HTHP) environment. Results were achieved through HTHP OFITE Viscometer (Model 1100).

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