Study on the effect of silica fume with low calcium geopolymer properties for oil well cementing

2015 ◽  
Author(s):  
M. Sugumaran ◽  
R.R. Suppiah
Keyword(s):  
Silica Fume ◽  
Oil Well ◽  
Low Calcium

scholarly journals Influence of high volumes of silica fume on the rheological behavior of oil well cement pastes

2021 ◽  
Author(s):  
Jedadiah Burroughs ◽  
Jason Weiss ◽  
John Haddock
Keyword(s):  
Silica Fume ◽  
Rheological Behavior ◽  
High Performance ◽  
High Performance Concrete ◽  
Oil Well ◽  
Ultra High Performance Concrete ◽  
Conventional Concrete ◽  
Cement Pastes ◽  
Specific Source ◽  
Well Cement

Specialized classes of concrete, such as ultra-high-performance concrete, use volumes of silica fume in concrete that are higher than those in conventional concrete, resulting in increased water demand and mixing difficulty. This study considered the effects of eight different silica fumes in three dosages (10%, 20%, 30%) with three w/b (0.20, 0.30, 0.45) on rheological behavior as characterized by the Herschel-Bulkley model. Results indicated that the specific source of silica fume used, in addition to dosage and w/b, had a significant effect on the rheological behavior. As such, all silica fumes cannot be treated as equivalent or be directly substituted one for another without modification of the mixture proportion. The rheology of cement pastes is significantly affected by the physical properties of silica fume more so than any chemical effects.

Effects of Fly Ash and Superplasticizers on the Rheology of Cement Slurries

1984 ◽  
Vol 43 ◽  
Author(s):  
Elizabeth L. White ◽  
Maria Lenkei ◽  
Della M. Roy ◽  
Ferenc D. Tamas
Keyword(s):  
Fly Ash ◽  
Partial Substitution ◽  
Oil Well ◽  
Low Calcium ◽  
Chemical Admixture ◽  
High Calcium ◽  
High Calcium Fly Ash ◽  
Oil Well Cement ◽  
Large Particles ◽  
Well Cement

AbstractCementitious slurries composed of an oil well cement, a high calcium fly ash, a low calcium fly ash, and three commercially available superplasticizers (two different sulfonated naphthalene formaldehyde condensates and a sulfonated melamine formaldehyde condensate)were mixed to contrast the two fly ashes and to determine the effectiveness of each of the superplasticizing agents. Most commercial superplasticizers and cements are relatively expansive; therefore a partial substitution by fly ash and other by-products represents a substantial savings in both quantity of chemical admixture required and energy consumption for the manufacture of cement. In the cement/fly ash mixtures of 100/0, 90/10, 60/40, 40/60, and 10/90, with both high calcium fly ash and low calcium fly ash, the mixture containing the low calcium fly ash was consistently less workable. The rheological properties of the high vs. low calcium fly ash mixtures were controlled by the differences in fly ash particle size and the presence of irregular large particles, rather than by the differences in chemistry between the two. The low calcium fly ash was the coarser material.

scholarly journals Towards Ultrahigh Performance Concrete Produced with Aluminum Oxide Nanofibers and Reduced Quantities of Silica Fume

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2291
Author(s):  
Scott Muzenski ◽  
Ismael Flores-Vivian ◽  
Behrouz Farahi ◽  
Konstantin Sobolev
Keyword(s):  
Strain Hardening ◽  
Silica Fume ◽  
Structural Response ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Oil Well ◽  
Type I ◽  
Synthetic Fibers ◽  
Dense Microstructure ◽  
Type V

Ultrahigh performance concrete (UHPC), which is characterized by dense microstructure and strain hardening behavior, provides exceptional durability and a new level of structural response to modern structures. However, the design of the UHPC matrix often requires the use of high quantities of supplementary cementitious materials, such as silica fume, which can significantly increase the cost and elevate the production expenses associated with silica fume handling. This paper demonstrates that a fiber-reinforced composite with properties similar to conventional UHPC can be realized with very low quantities of silica fume, such as 1% by mass of cementitious materials. The proposed UHPC is based on reference Type I cement or Type V Portland cement with very low C3A (<1%) that also complies with Class H oil well cement specification, silica fume, small quantities of Al2O3 nanofibers, and high-density polyethylene or polyvinyl alcohol macro fibers. Previous research has demonstrated that nanofibers act as a seeding agent to promote the formation of compact and nanoreinforced calcium silicate hydrate (C-S-H) clusters within the interparticle and nanofiber spaces, providing a nanoreinforcing effect. This approach produces a denser and stronger matrix. This research expands upon this principle by adding synthetic fibers to ultrahigh strength cement-based composites to form a material with properties approaching that of UHPC. It is indicated that the developed material provides improved strain hardening and compressive strength at the level of 160 MPa.

scholarly journals COMPRESSIVE AND SHEAR BOND STRENGTH OF OIL WELL CEMENT WITH CALCIUM CARBONATE AND SILICA FUME

2017 ◽  
Vol 13 (4) ◽  
pp. 255
Author(s):  
Arnoldus Meidio Adi Prasetyo ◽  
Ade Lisantono
Keyword(s):  
Compressive Strength ◽  
Calcium Carbonate ◽  
Bond Strength ◽  
Silica Fume ◽  
Shear Bond Strength ◽  
Strength Testing ◽  
Oil Well ◽  
Cement Slurry ◽  
Oil Well Cement ◽  
Well Cement

One of the critical factors of cementing process in oil drilling of off-shore-project is designing the cement slurry. For this reason, the slurry properties which have been classified by American Petroleum Institute (API) should be changed so it will match with the requirement of reservoir condition. Changing the slurry properties can be done by adding the additive material into the cement slurry such as Calcium Carbonate and Silica Fume. The research objective is to study the effect of calcium carbonate and silica fume to the compressive and shear bond strength of oil well cement. Fourty five cylinder specimens with the size of (75 x 150) mm were made for compressive strength testing and fourty five cylinder specimens with the size of (25.4 x 50.8) mm were made for shear bond strength testing. Five variants of the specimen were made in this study. The variant were cement slurry with (0% Calcium Carbonate + 0 % Silica Fume) as a reference specimen; (5% Calcium Carbonate + 5 % Silica Fume); (10% Calcium Carbonate + 10 % Silica Fume); (15% Calcium Carbonate + 15 % Silica Fume); (20% Calcium Carbonate + 20 % Silica Fume). The oil well cement specimens were tested in 7, 14, and 28 days. The experimental results show that the compressive strength of oil well cement will decrease when it is added with calcium carbonate and silica fume. The shear bond strength of the oil well cement increases for the specimen with 5 % Calcium Carbonate + 5 % Silica Fume. However, the shear bond strength will decrease when content of the Calcium Carbonate + Silica Fume more than 5 %. Based on the result of this research, the optimum amount of calcium carbonate and silica fume that can be use is 5%, because with 5% of calcium carbonate and 5% of silica fume, the reducing of compressive strength is the smallest and the shear bond strength is increased compare to the others specimen with 10%, 15%, and 20% calcium carbonate and silica fume.

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