scholarly journals Experimental Study on Ready-Mix Concrete: Case Study

2018 ◽  
Vol 149 ◽  
pp. 01071
Author(s):  
Dorra Ellouze ◽  
Aida Ghammouri ◽  
Rahma Ben Amar
2018 ◽  
Vol 149 ◽  
pp. 01071
Author(s):  
Dorra Ellouze ◽  
Aida Ghammouri ◽  
Rahma Ben Amar

Ready-mix concrete (RMC) in Tunisia is becoming more and more in demand in the civil engineering sector thanks to its qualities of handling in the fresh state and resistance in the hardened state, this composite material must respect the quality-price ratio. A RMC with a minimal cost is the object of our work. This research is part of the opening of higher education on professional life, where we optimized the formulation of a RMC. This work has 3 axes. In the first place the resources in building materials were characterized, namely various samples of sand, gravel, cement and water. Subsequently, the adjuvant-cement ratio (A/C) was optimized. Finally, the workability of the concrete as well as its mechanical aptitude at various ages 7, 14 and 28 days were characterized. These examinations have resulted in an appropriate formulation for any type of resource that varies according to the provenance of the quarries (gravel and sand), the effect of the plasticizer-water reducer is found for a very interesting A/C ratio, the mechanical tests for different ages are also conclusive.


Water ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 699
Author(s):  
Ruifeng Wang ◽  
Xiong Wu ◽  
Yanliang Zhai ◽  
Yuxuan Su ◽  
Chenhui Liu

Chengde City boasts a wealth of high-quality mineral water resources characterized by a high level of strontium (Sr), a low level of sodium, and low alkalinity. In order to study the mechanism of formation of Sr-bearing mineral water in Chengde and to scientifically guide future mineral water exploration, taking three typical mineral water exploration areas in Chengde as examples, this paper studies the sources of Sr in mineral water and the general rules of its dissolution via a laboratory static leaching experiment and impact experiments, and it provides an analysis of the characteristics of typical rock samples. The research results indicate that the content of Sr in surrounding rock and the characteristics of minerals existing in surrounding rock jointly control the dissolution of Sr in water; that CO2 can promote the formation of mineral water containing Sr; and that temperature increases may boost the dissolution of Sr from carbonate minerals but also inhibit the dissolution of Sr from silicate minerals.


2020 ◽  
Vol 23 ◽  
pp. 36-57
Author(s):  
Iker Fidalgo Alday

El presente artículo parte de un caso de estudio concreto que es la investigación en torno al archivo del colectivo artístico “Fundación Rodríguez” (Vitoria-Gasteiz, 1994-2012). El proceso de investigación estará marcado por todo lo que conlleva enfrentarse a un archivo compuesto por contenido digital y con formatos a punto de la obsolescencia, así como las dificultades para su conservación y mantenimiento. Partiendo de esto, se contextualizará la práctica de “Fundación Rodríguez” y el papel que juega el concepto de archivo en varias de las fases de su producción artística. Para ello analizaremos su posición desde el trabajo colectivo, la disolución del rol del artista y la desmaterialización de la obra artística como los tres frentes principales desde los que se erige su producción. Con todo, podremos valorar desde la actualidad la vigencia y relevancia de su legado, así como la potencia del mismo en el contexto artístico al que pertenece. This article starts from a concrete case study that is the research around the archive of the artistic collective “Fundación Rodríguez” (Vitoria-Gasteiz, 1994-2012). The research process will be marked by all that is involved in dealing with an archive composed of digital content and formats on the verge of obsolescence, as well as the difficulties of preserving and maintaining them. Starting from this, the practice of “Fundación Rodríguez” and the role played by the concept of archive in several of the phases of its artistic production will be contextualized. To do so, we will analyze its position from the perspective of collective work, the dissolution of the role of the artist and the dematerialization of the artistic work as the three main fronts from which its production is built.With all this, we will be able to evaluate from the present time the validity and relevance of his legacy as well as its power in the artistic context to which it belongs.


Author(s):  
Ferdinando Di Martino ◽  
Vincenzo Loia ◽  
Salvatore Sessa ◽  
Michele Giordano
Keyword(s):  

2020 ◽  
Vol 10 (1) ◽  
pp. 1-12
Author(s):  
Noura A. AlSomaikhi ◽  
Zakarya A. Alzamil

Microblogging platforms, such as Twitter, have become a popular interaction media that are used widely for different daily purposes, such as communication and knowledge sharing. Understanding the behaviors and interests of these platforms' users become a challenge that can help in different areas such as recommendation and filtering. In this article, an approach is proposed for classifying Twitter users with respect to their interests based on their Arabic tweets. A Multinomial Naïve Bayes machine learning algorithm is used for such classification. The proposed approach has been developed as a web-based software system that is integrated with Twitter using Twitter API. An experimental study on Arabic tweets has been investigated on the proposed system as a case study.


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