Microsilica Concrete

The objective of this study is to analyse the performance of Microsilica and Fly Ash in concrete when it is mixed in cement concrete for workability and strength of concrete using OPC 53 grade. Efforts are to improve and develop high performance concrete with the help of past years result which suggests that by the use of cement replacement materials for some determined percentage along with admixtures can help to increase the strength and consistency characteristics of concrete. This study analyzes the performance of concrete mix for compressive strength of cubes at 7 and 28 days and flexural strength of beams for 28 days respectively for M-25 grade concrete. To analyse these properties of concrete, the total investigation was conducted into three groups. The first beam will be a normal beam (Type N); in second beam we replace aggregate by microsilica and fly ash in tension zone (Type NT); in third beam we will replace aggregate in whole beam by fly ash and microsilica (Type NA). Super plasticizer was used to increase the workability at water-cement ratio of 0.43 for all combinations. On the basis of past result the replacement of cement by Microsilica and Fly Ash was found to increase in strength.

For the construction industry there is a place for the development and implementation of resource-and energy-efficient building materials, innovative technologies for their production. So, in modern monolithic construction, high-tech concrete mixes are increasingly being used, capable of filling formwork (form), including densely reinforced and with complex geometry, while maintaining cohesion and homogeneity-self-compacting concrete (SCC) without the use of any external mechanical impact. Along with high workability such concretes are characterized by rapid rates of curing, high physical and mechanical characteristics.

For the construction industry there is a place for the development and implementation of resource-and energy-efficient building materials, innovative technologies for their production. So, in modern monolithic construction, high-tech concrete mixes are increasingly being used, capable of filling formwork (form), including densely reinforced and with complex geometry, while maintaining cohesion and homogeneity-self-compacting concrete (SCC) without the use of any external mechanical impact. Along with high workability such concretes are characterized by rapid rates of curing, high physical and mechanical characteristics.

O objetivo deste trabalho foi avaliar o efeito da adição de microssílica em três porcentagens (0, 20 e 30%) sobre as propriedades físicas e mecânicas de painéis cimento-madeira de Eucalyptus urophylla compostos por três relações madeira:casca (100:0, 95:5 e 90:10). Os resultados mostraram que o efeito mais significativo do aditivo sobre os painéis produzidos ocorreu naqueles que continham casca, e que a adição de 20% do aditivo foi mais eficiente sobre as propriedades físicas e mecânicas.

O objetivo deste trabalho foi avaliar o efeito da adição de microssílica em três porcentagens (0, 20 e 30%) sobre as propriedades físicas e mecânicas de painéis cimento-madeira de Eucalyptus urophylla compostos por três relações madeira:casca (100:0, 95:5 e 90:10). Os resultados mostraram que o efeito mais significativo do aditivo sobre os painéis produzidos ocorreu naqueles que continham casca, e que a adição de 20% do aditivo foi mais eficiente sobre as propriedades físicas e mecânicas.

This article reviews the manufacturing nanotechnologies of modern refractory concretes and some other cementitious materials. The main part of the article focuses on the results obtained by the authors who analyzed the application of nanotechnology for manufacturing refractory concretes and examined the influence of nanostructure formation in the binding material on the properties of refractory concretes. In one case, investigations were carried out using two‐component (sodium silicate solution mixed with dicalcium silicate) and three‐component (sodium silicate solution mixed with dicalcium silicate plus calcium aluminate cement) binding materials, whereas in other case, multi‐component material, middle cement refractory concrete with mullite aggregates, microsilica and additives of single and hybrid deflocculant (polycarboxylate ether Castament FS20 and sodium tripolyphosphate) were researched. Preliminary investigations showed that the three‐component binding material under develo...

A brief description about how the Engineering design and Quality Control on the Metallurgical Silicon Industry is important to increase the benefits of the downstream effects of Silicon in Chemical Industry and micro Silica in the Construction industry.

Abstract — in the past decades, the Metallurgical Silicon Industry has facing a very strong development with more applications for the final product (Silicon) and mainly the by-product Microsilica. The metallurgical silicon demand, even considering the crisis period of 2008 has faced a very strong increase comparing the last decade of +60% of world demand. This increase is reflected in a strong development of photovoltaics industry worldwide (TCS – Trichlorosilane), the Silicones (MCS – Methylchorosilane) industry growth also has impact on the total Silicon demand and last, but not least, the Aluminium industry development for the past decade. In other hand, with the increase of the construction industry, the requirement of cements and the quality development of this product is also impacting the need of the process development and quality levels. In parallel, the Ferroalloys and Silicon industry have facing more environmental restrictiveness in their production process, that generate huge volumes of carbon dioxide and micro silica particulates. This by-product of the Silicon industry, the Micro Silica had aggregate value to the concrete industry in terms of quality. The main objective of this article is to highlight the most important methods, procedures and innovative developments that once appropriately used in the Quality Control and Engineering design of the metallurgical Silicon plant and further process operations, can bring values to the final product Silicon and also to the by-product microsilica that will be well perceived in the downstream related to the Concrete and Chemical Supply Chain. (241 words).

Keywords — Metallurgical Silicon, Micro Silica, Concrete, Polysilicon, Silicones, Trichlorosilane, Methylchlorosilane, Quality Control, Innovation, Atomization, Interface Risks, Front End Loading, Process Design, casting, refining of Silicon, off gas system design.