scholarly journals Use of polypropylene fiber and silica fume modified concrete as a repair material

2018 ◽  
Vol 199 ◽  
pp. 07008
Author(s):  
Jing Liu ◽  
Wen Liu ◽  
Shugang Guan ◽  
Chao Guo ◽  
and Xinguo Zheng
Keyword(s):  
Compressive Strength ◽  
Silica Fume ◽  
Cement Paste ◽  
Polypropylene Fiber ◽  
Repair Material ◽  
Chloride Permeability ◽  
Cracking Resistance ◽  
Transition Zones ◽  
Concrete Properties ◽  
Fiber Matrix

Polypropylene fiber and silica fume were used to get high impermeability and cracking resistance concrete as a repair material. Results showed just incorporating fiber (without silica fume) had no obvious improvement on strength and impermeability of concrete. The usage of polypropylene fiber and silica fume together in concrete increased the compressive strength and caused a significant reduction in chloride permeability. The improvement of fiber and silica fume on concrete properties was attributed to both the anti-cracking effect from polypropylene fiber and densification reinforcement action to the interfacial transition zones of both fiber —matrix and aggregate—cement paste from silica fume. These properties made them suitable for certain applications such as concrete repairs.

The Reasonable Amount of Polypropylene Fiber on Low-Intensity Manufactured Sand Concrete in the Case of Fixed Powder Paste

2014 ◽  
Vol 1065-1069 ◽  
pp. 2005-2010
Author(s):  
Hao Lu ◽  
Gu Hua Li ◽  
Jia Wei Yang ◽  
Liang Zhang ◽  
Ze Jiang Sun ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Cement Paste ◽  
Polypropylene Fiber ◽  
Particle Type ◽  
River Sand ◽  
Manufactured Sand ◽  
Low Intensity ◽  
Reasonable Amount

Compared with the river sand, manufactured sand’s particle type and gradation is relatively poor and the surface is mat .The manufactured sand also has a big effect on the workability of concrete. In this paper,the Equivalent powder paste’s volume of manufactured sand concrete was determined according to Mehta and Aitcin’s ideas for the preparation of HPC,at the same time,the equivalent powder paste volume is assumed as the cement paste volume in the experiment. The influence of polypropylene fiber on Manufactured sand concrete’s workability and Compressive strength were researched in the case of fixed powder paste .

scholarly journals SEM Image Analysis in Permeable Recycled Concretes with Silica Fume. A Quantitative Comparison of Porosity and the ITZ

Materials ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2201 ◽  
Author(s):  
Manuel J. Chinchillas-Chinchillas ◽  
Carlos A. Rosas-Casarez ◽  
Susana P. Arredondo-Rea ◽  
José M. Gómez-Soberón ◽  
Ramón Corral-Higuera
Keyword(s):  
Image Analysis ◽  
Silica Fume ◽  
Cement Paste ◽  
Chemical Elements ◽  
Energy Dispersive Spectrometer ◽  
Recycled Aggregates ◽  
Porous Network ◽  
Transition Zones ◽  
Sem Image ◽  
Coarse Aggregates

Recycled aggregates (RA) from construction and demolition can be used in permeable concretes (PC), improving the environment. PCs have a significant porous network, their cement paste and the interaction between the paste and the RA establishing their strength. Therefore, it is important to evaluate the porosity in the interfacial transition zones. The porosity of the cement paste, the aggregate and the interfacial transitional zones (ITZ) of a PC with recycled coarse aggregates (RCA) and silica fume (SF) is measured by means of image analysis–scanning electron microscope (IA)-(SEM) and by mapping the chemical elements with an SEM-EDS (energy dispersive spectrometer) detector microanalysis linked to the SEM and, as a contrast, the mercury intrusion porosimetry technique (MIP). In the IA process, a “mask” was created for the aggregate and another for the paste, which determined the porosity percentage (for the anhydrous material and the products of hydration). The results showed that using SF caused a reduction (32%) in the cement paste porosity in comparison with the PC with RA. The use of RA in the PC led to a significant increase (190%) in the porosity at different thicknesses of ITZ compared with the reference PC. Finally, the MIP study shows that the use of SF caused a decrease in the micropores, mesopores and macropores.

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.

Producing High Strength Hollow Core Reinforced Concrete Slab with Silica Fume and Polypropylene Fibers

2016 ◽  
Vol 866 ◽  
pp. 143-147
Author(s):  
Evalyn Joy M. Castil ◽  
Nathaniel C. Tarranza
Keyword(s):  
Compressive Strength ◽  
Reinforced Concrete ◽  
Flexural Strength ◽  
Silica Fume ◽  
Concrete Slab ◽  
Polypropylene Fiber ◽  
Optimum Combination ◽  
Hollow Core ◽  
Reinforced Concrete Slab ◽  
Concrete Mix

The compressive strength and workability of concrete mixes with the same proportion of cement, sand, gravel and water but with different amounts of silica fume and polypropylene fiber admixtures were investigated. The same concrete mixes were used for producing hollow core reinforced concrete (HCRC) slab-strip samples tested for flexural strength under third-point loading. The HCRC slab-strip samples were reinforced with the same number and size of reinforcing bars. Silica fume content of 0%, 5%, 10%, 15% and 20% by weight of cement, in combination with polypropylene fiber at 0 kg , 0.40 kg , 0.60 kg and 0.80 kg per cubic meter of concrete, were added into the concrete mix. Tests demonstrate that there is an optimum combination of silica fume and polypropylene fiber for maximum gain in concrete compressive strength of the concrete mix, and another optimum combination of the same admixtures for optimal gain in flexural strength of the HCRC slab-strip samples produced using the concrete mix.

Dry Shrinkage and Compressive Strength of Blended Cement Pastes with Fly Ash and Silica Fume

2012 ◽  
Vol 535-537 ◽  
pp. 1735-1738 ◽  
Author(s):  
Yan Li ◽  
Dao Sheng Sun ◽  
Xiu Sheng Wu ◽  
Ai Guo Wang ◽  
Wei Xu ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Silica Fume ◽  
Cement Paste ◽  
Blended Cement ◽  
Drying Shrinkage ◽  
Cementitious Material ◽  
Strength Increase ◽  
Cement Pastes ◽  
Dry Shrinkage

This paper reports the drying shrinkage and compressive strength results of cement pastes with fly ash and silica fume. In this study, Portland cement (PC) was used as the basic cementitious material. Fly ash (FA) and silica fume (SF) were used as cement replacement materials at levels of 0%, 5%, 10%, and 15% , 40%, 35%, 25%, and 15% by weight of the total cementitious material, respectively. The water/cement (PC + FA + SF) ratios (w/c) was 0.28 by weight. The samples produced from fresh pastes were demoulded after a day; then they were cured at 20 ±1°C with 50 ± 3% relative humidity (RH) until the samples were used for drying shrinkage and compressive strength measurement at various ages. The results show that drying shrinkage and compressive strength increase with increasing SF content, and the optimum composition of blended cement pastes is the cement paste with 30% fly ash and 10% silica fume, which possesses lower drying shrinkage values than that of plain cement paste and higher early age strength than that of blended cement pastes with fly ash. Furthermore, a linear relationship is established between compressive strength and drying shrinkage. By comparing the development of compressive strength and the drying shrinkage deformations, it appears possible to predict the drying shrinkage according to the acquired compressive strength.

Incorporation of graphene oxide and silica fume into cement paste: A study of dispersion and compressive strength

2016 ◽  
Vol 123 ◽  
pp. 327-335 ◽  
Author(s):  
Xiangyu Li ◽  
Asghar Habibnejad Korayem ◽  
Chenyang Li ◽  
Yanming Liu ◽  
Hongsen He ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Graphene Oxide ◽  
Silica Fume ◽  
Cement Paste

scholarly journals Concrete Properties using Treated Recycled EPS

2021 ◽  
Vol 877 (1) ◽  
pp. 012028
Author(s):  
Hasan Jasim Mohammed ◽  
Yasir Gaib Hussein
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Silica Fume ◽  
Coarse Aggregate ◽  
Splitting Tensile Strength ◽  
The Other ◽  
Modulus Of Rupture ◽  
Normal Concrete ◽  
Concrete Properties

Abstract The study explores the mechanical properties of treated recycled extended polystyrene (TEPS) concrete, treated by two methods, one by heating, and the other by immersed recycled EPS in cement neat. By substituting 0 %, 15 %, 25 %, and 35 % of the coarse aggregate volume with treated recycled EPS, (for both method). Treated recycled TEPS concrete ratios are experimentally prepared, while the cement is substituted thru 10 % silica fume (SF). Tests were carried out, like compressive strength, splitting tensile strength, modulus of rupture, and density. The outcomes display the decreasing of the compressive strength, tensile strength and modulus of rupture of TEPS concretes with rise TEPS percentage around 26 %, 17 % and 32 %, respectively (35% TEPS) related to standard concrete. They also show that TEPS concrete density decrease about 30 % of normal concrete. The TEPS is suitable in concrete and meets provisions.

scholarly journals Experimental Investigation on Rcc by Using Multiple Admixtures

2018 ◽  
Vol 7 (3.3) ◽  
pp. 14 ◽  
Author(s):  
Professor P.Venkatreddy ◽  
A Siva Krishna ◽  
G SwamyYadav
Keyword(s):  
Mechanical Properties ◽  
Experimental Investigation ◽  
Compressive Strength ◽  
Silica Fume ◽  
Research Work ◽  
Copper Slag ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Flexure Strength ◽  
Concrete Properties

In this article, the effect of replacing cement with silica fume and fine aggregate with copper slag has been investigated. For this research work, concrete of M40 grade is prepared and evaluated for fresh and harden concrete properties such as compressive strength, tensile strength and flexural strength. Further, the cement is replaced with silica fume at 0, 2, 4, 6, 8 and 10 % and fine aggregate replaced with copper slag at 0, 10, 20, 30, 40 and 50 %. Compressive strength, strength and Flexure strength have been tested. It is observed from the results that the use of silica fume and copper slag as partial replacement material improves mechanical properties of the concrete. Concrete with 40 % copper slag and 8 % silica fume shows better performance among all the mixes.  

HYDRATION KINETICS OF CEMENT PASTE WITH SILICA FUME AND FLY ASH

2016 ◽  
Vol 3 (1) ◽  
Author(s):  
Miguel Picornell ◽  
Sameer Hamoush ◽  
Taher Abu-Lebdeh
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Silica Fume ◽  
Cement Paste ◽  
Regional Analysis ◽  
Testing Machine ◽  
Testing System ◽  
Hydration Kinetics ◽  
Curing Conditions ◽  
Water Curing

This research study investigates the effect of fly ash and silica fume on the cement paste hydration. A total of 350 samples of different percentages of each additive were tested and compared with the controlled cement paste without additives. Testing method includes water curing and vacuum curing conditions and involves the use of Forney Universal Testing Machine and MTS Landmark Servohydraulic Testing System (MTS) for compressive strength; Fourier Transfer Infrared Spectroscopy (FTIR) monitored the hydration with spectra; and Scanning Electron Microscope (SEM) generated images for regional analysis. Compressive strength testing demonstrated that silica fume replacement had the highest overall strength under water curing. Replacement of fly ash exhibited the highest overall strength under vacuum curing. The hydration process was monitored with the use of FTIR and SEM. Signatures of CSH which produce most of the concretes’ strength, has been determined and examined from 3 to 56 days. FTIR and SEM testing showed an increase in the change of CSH area with age. SEM testing revealed the formation of pores, CSH, and CH in images at all ages. The area of CSH grows most in early ages and diminishes over time. It is clear that the method of curing makes a difference in hydration. Results indicated that the area at which the possible formation of CSH was determined from each sample, has increased with respect to time; signifying the increase in strength over the course of testing days.

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