Microsilica Concrete: A Technological Breakthrough Commercialized

1984 ◽  
Vol 42 ◽  
Author(s):  
Farrokh F. Radjy ◽  
Kjell E. Loeland
Keyword(s):  
Silica Fume ◽  
High Strength ◽  
Binder Phase ◽  
Conventional Concrete ◽  
Technological Breakthrough ◽  
Micropore Structure ◽  
High Durability ◽  
New Generation ◽  
Condensed Silica Fume ◽  
The U.S

AbstractWith the advent of microsilica concrete, a new generation of high to ultra high strength and high durability concretes have become commercially feasible and are now being specified and used internationally. Microsilica concrete is produced by incorporating microsilica (beneficiated condensed silica fume) additives in conventional concrete mixes, using conventional materials and equipment. Flowing microsilica concretes with strengths as high as 17000 psi have become field realizable, also benefiting by durability improvements expressible by factors, not percents.Properties of microsilica concrete are reviewed, and property improvements qualitatively linked to a much refined micropore structure of the binder phase.Some recent and rapidly developing field and laboratory experience both in the U.S. and overseas are presented.

High strength mortars containing condensed silica fume

1984 ◽  
Vol 14 (5) ◽  
pp. 693-704 ◽  
Author(s):  
M. Buil ◽  
A.M. Paillère ◽  
B. Roussel
Keyword(s):  
Silica Fume ◽  
High Strength ◽  
Condensed Silica Fume

Use of ground coarse fly ash as a replacement of condensed silica fume in producing high-strength concrete

2004 ◽  
Vol 34 (4) ◽  
pp. 549-555 ◽  
Author(s):  
Chai Jaturapitakkul ◽  
Kraiwood Kiattikomol ◽  
Vanchai Sata ◽  
Theerarach Leekeeratikul
Keyword(s):  
Fly Ash ◽  
Silica Fume ◽  
High Strength Concrete ◽  
High Strength ◽  
Strength Concrete ◽  
Condensed Silica Fume

scholarly journals Use of condensed silica fume for making high-strength, self-consolidating concrete

2000 ◽  
Vol 27 (4) ◽  
pp. 620-627 ◽  
Author(s):  
A KH Kwan
Keyword(s):  
Silica Fume ◽  
High Performance ◽  
High Performance Concrete ◽  
Concrete Strength ◽  
High Strength ◽  
Self Consolidating Concrete ◽  
Concrete Mix ◽  
Binder Ratio ◽  
Condensed Silica Fume ◽  
Water Binder Ratio

A high concrete strength can be achieved by lowering the water/binder ratio and a high workability by adding a higher dosage of superplasticizer. However, a high-performance concrete with both high strength and high workability cannot be produced by just these means because lowering the water/binder ratio leads to lower workability and there is a limit to the increase in workability that can be attained by adding superplasticizer. To produce a high-strength, high-workability concrete, the concrete strength needs to be increased without lowering the water/binder ratio. This can be done by adding condensed silica fume. In this study, a series of trial mixing aimed at developing high-strength, self-consolidating concrete (mean cube strength >80 MPa and needs no compaction for consolidation) was carried out. Several mixes suitable for making such high-performance concrete have been developed and it was found that the addition of condensed silica fume may, under favourable conditions, increase not only the strength but also the workability of the concrete mix. Based on the trial mix results, charts for the design of high-strength, high-workability concrete mixes made of the studied constituents are presented.Key words: condensed silica fume, high-strength concrete, self-consolidating concrete.

scholarly journals Effect of Silica fume on Ordinary Portland Cement and Polymer Concrete Made out of M Sand

2019 ◽  
Vol 9 (2S2) ◽  
pp. 42-46
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Silica Fume ◽  
Unsaturated Polyester ◽  
High Strength ◽  
Pozzolanic Reaction ◽  
Maximum Strength ◽  
Polymer Concrete ◽  
Split Tensile Strength ◽  
Conventional Concrete

In this investigation, conventional concrete was made with replacing the sand by 80 % of M-sand and the cement by fillet material silica fume in varying percentages say 5%, 10 % , and 15%, to study the compressive strength, split tensile strength and flexural strength. In order to the maximum strength was attained at 10% of silica fume. The result showed that by increasing the silica fume content, the strength of the M-sand concrete was decreased because higher fineness of silica fume content decreases the strength of the M-sand concrete. Secondly polymer concrete with unsaturated polyester resin with hardener MEKP, Cobalt as the accelerator and silica fume in varying percentages say 0%, 5% and 10% was made to study the compressive strength and split tensile strength of polymer concrete. In improved silica fume content the strength was high. Polymer concrete improved the mechanical properties. Polymer concrete system was mainly useful to fill the micro voids. In this research, the maximum strength was attained at 5% of silica fume filler added with polymer concrete. Thus the high strength of the concrete was obtained due to the pozzolanic reaction with the silica fume.

scholarly journals Production technology of prefabricated structures using fibre cement

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Nikolay Spiridonov ◽  
Azariy Lapidus
Keyword(s):  
Cross Section ◽  
Production Technology ◽  
Raw Materials ◽  
Compressive Force ◽  
High Mobility ◽  
High Strength ◽  
Polymer Fibers ◽  
Conventional Concrete ◽  
The Cross ◽  
New Generation

The article deals with the production technology of prefabricated structures using fiber cement. Studying the properties of these structures, the author points out that the use of fiber cement made of polymer fibers is advisable in the manufacturing process of prefabricated structures, as a result of their use increases crack resistance, impact strength, fracture toughness, wear resistance, frost resistance, cavitation resistance, and also decreases shrinkage and creep Also in the article noted that the use of fiber cement structures without reinforcement is possible, if their primary work is aimed at compression in the case of the location of the longitudinal compressive force within the cross-section of the element or if the longitudinal compressive force is located outside the cross-section of the element and the bend, but it should be borne in mind that their destruction should not create an immediate danger to such objects, the life and health of workers, it is also necessary to control the serviceability and safety of the equipment. The author comes to the conclusion that today there are a number of opportunities to create high-strength fibroblasts of new generation, using domestic raw materials. Modern effective types of fiber make it possible to simplify the process of its introduction and mixing in the concrete mix, as well as make it possible to use technological equipment that is used in the manufacture of conventional concrete. At the same time, it is possible to obtain and use fiber cement mixtures with high mobility.

Special Binding for Refractory Concretes

2019 ◽  
Vol 17 (17) ◽  
pp. 11-16
Author(s):  
Elena Valentina Stoian ◽  
Dan Nicolae Ungureanu ◽  
Florin Toma ◽  
Alexandru Gabriel Colţa ◽  
Daniel Anculescu ◽  
...  
Keyword(s):  
Silica Fume ◽  
Ph Value ◽  
Concrete Structures ◽  
Hydrated Alumina ◽  
Binding System ◽  
Hydraulic Binder ◽  
Aluminous Cement ◽  
Mechanical Strengths ◽  
Condensed Silica Fume ◽  
New System

AbstractThe paper shows data related to coexistence of various binding systems, which could be present during the hardening of special concretes. It is taken into account the Ultra Low Aluminous Cement Concretes additivated with different materials (phosphates and mineral ultra dispersed powders - Condensed Silica Fume, Hydrated Alumina etc). In correlation to the pH-value, these substances can favour the forming of new binding systems besides the hydraulic binder (which is not important in this case). The new system is the coagulation binding form. The coagulation binding system has a very important role in the advanced compactness and in the increasing mechanical strengths of concrete structures.

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