ESTUDO DAS RELAÇÕES DE RESISTÊNCIA E CONDUTIVIDADE HIDRÁULICA DO PAVIMENTO PERMEÁVEL ADITIVADO COM POZOLANA

2020 ◽  
Vol 9 (11) ◽  
pp. 1-9
Author(s):  
Adilson Martins de OLIVEIRA JUNIOR ◽  
Cláudia Scoton Antonio MARQUES
Keyword(s):  
Compressive Strength ◽  
Hydraulic Conductivity ◽  
Physical Characteristics ◽  
The Other ◽  
Urban Drainage ◽  
Strength Testing ◽  
Large Cities ◽  
Great Performance ◽  
The Relationship ◽  
Slight Advantage

Com o desenvolvimento dos grandes centros urbanos e o aumento das áreas impermeáveis, surge a necessidade de aumentar as áreas permeáveis, sem abrir mão do pavimento de concreto e ainda assim ajudar na drenagem urbana, tirando a sobrecarga dos sistemas de drenagem tradicionais. Desse modo, o objetivo desta pesquisa é comparar dois traços de concreto permeável com as mesmas características físicas e mesmas compactações, mas tendo como diferença o tipo de cimento a ser empregado que serão o CP II-E e o CP II-Z, ambos com 32 MPa de resistência, com isso serão analisadas quais as mudanças na resistência e na permeabilidade dos corpos de prova que podem ocorrer. Serão moldados em laboratório cerca de 6 corpos de prova para ensaios de resistência à compressão e mais 4 corpos para os ensaios de permeabilidade que seguiram as especificações da NBR 16416 com algumas adaptações e foram cronometrados o tempo que o corpo de prova demorava para absorver certa quantidade de água e usando uma fórmula disponível na mesma norma. Os resultados indicam que não houve diferenças significativas entre os traços comparados, porém a resistência de ambos foram superiores às observadas em outras pesquisas e notou-se que os traços feitos com o CP II-Z tiveram uma ligeira vantagem, mas ainda ficam empatados com o outro traço. No quesito de permeabilidade, ambos têm um ótimo desempenho, pois atendem aos critérios mínimos da NBR 16416. Conclui-se que a comparação entre esses dois cimentos não mostrou tantas diferenças significativas, porém foi observado que a compactação e cura são elementos fundamentais para agregarem resistência aos pavimentos drenantes. Com isso, é possível ampliar o leque de aplicações para que no futuro se possa adotar o pavimento permeável até mesmo em vias públicas e rodovias.   A STUDY OF THE RELATIONSHIP BETWEEN STRENGTH AND HYDRAULIC CONDUCTIVITY OF THE PERMEABLE PAVING ADDED WITH POZZOLAN   ABSTRACT Along with the development of large cities and the increase in impermeable areas, it raises the need for permeable areas expansion without forgoing the concrete paving and after all promoting urban drainage in order to unburden the traditional drainage systems. Accordingly, this study sought to compare two traits of permeable concrete with the same physical characteristics, the same compaction, although they differ in the type of concrete to be applied, they are CP II-E and CP II-Z, both 32 MPa resistant, hence possible changes to occur in strength and permeability of the specimen will be analyzed. In the laboratory, six specimens will be mold for compressive strength testing, and four extra specimens for permeability testing following NBR 16416 standard with some adaptations, we measured the time the specimen takes for absorbing an amount of water, as well as an available formula following the same standards.  The results suggest that there were no significant differences between the traits when compared. However, the strength for both was higher when compared to other studies, it was noticed that traits made with CP II-Z presented a slight advantage, nevertheless, they are similar to the other trait. Regarding permeability, both had a great performance, since they meet the minimum NBR 16416 standards. We concluded that the comparison between those concretes had not presented significant differences, though we observed that compaction and drying are key elements to add strength to draining concrete paving. Hence, it is possible to broaden applications in order to adopt permeable paving even for public roads and highways.   Keywords: Permeable paving. Drainage. Concrete.

scholarly journals The Interiority of Proximity Between Nature and Architecture in Contemporary and Tropically Context with Cases Studies

2019 ◽  
Vol 3 (2) ◽  
pp. 129-144
Author(s):  
Budi Pradono
Keyword(s):  
Information Technology ◽  
Case Studies ◽  
Temperature Difference ◽  
Air Conditioning ◽  
The Other ◽  
Asian Countries ◽  
Tropical Countries ◽  
Large Cities ◽  
Tropical Climates ◽  
The Relationship

The interiority of buildings in tropical countries requires specific characteristics unlike those in countries with four distinct seasons. Buildings in non-tropical climates must protect their inhabitants from extreme weather, meaning that the architecture’s connection with nature is necessarily limited by a boundary which can withstand extreme climatic differences. In tropical countries, on the other hand, the temperature does not fluctuate much throughout the year, so the temperature difference between seasons is not extreme. This characteristic is reflected in traditional Nusantara architecture, which incorporates a breathable wall so that free winds come in, reducing heat. The roof is tilted or saddled-shaped to keep rain water away from the building. The architecture uses organic materials and includes terraces for dialogue with nature. Modern Indonesian architecture, however, particularly in large cities, is mostly closed off, severely limiting the interaction with nature. Since the advent of air conditioning (AC) technology during the 1980’s, architecture has changed to seal the boundaries of the building. Advances in information technology such as Internet and smartphones have made for further changes to architecture in the area; some functional spaces are being discarded, while others are expanded. The relationship between architecture and nature is now constrained by impenetrable materials such as brick, concrete and glass, as opposed to the more traditional, permeable boundary. In contrast to this trend, modern Indonesian society is tempted to form a closer relationship with nature. This paper examines how a relationship between nature and the interior of buildings may be accommodated again, presenting some existing projects by several architects from Europe and Asian countries—including the authors’ own work—as case studies.

Physical Properties and Leachability of MLW Stream Containing Cr, Ni and Cd Immobilized in a Cement Matrix

1988 ◽  
Vol 127 ◽  
Author(s):  
E. Zamorani ◽  
I. A. Sheikh ◽  
M. Della Rossa ◽  
G. Serrini
Keyword(s):  
Compressive Strength ◽  
Physical Properties ◽  
Chloride Ions ◽  
Physical Characteristics ◽  
The Other ◽  
Cement Clinker ◽  
Cement Matrix ◽  
Spent Fuel ◽  
Metal Hydroxides ◽  
Low Concentration

ABSTRACTCement samples containing variable amounts of Cr(III) or Ni(II) or Cd(II) as chloride admixtures present in a MLW stream from reprocessing of spent fuel were prepared under established procedure. Due to the high pH generated in the cement clinker hydration, respective metal hydroxides are formed and improve the physical characteristics of the cement matrix. An increase in the value of the compressive strength was observed when about 7% of the above elements were blended in cement. The increase depends on the nature of the element in the sequence Cr >Ni >Cd.The leach tests confirm the formation of insoluble hydroxide presenting a low concentration in the leachate corresponding to 0.05, 0.004 and 0.052 mg.L−1 for Cr, Ni and Cd, respectively. On the other hand, the hydro-lyzed chloride ions seem to react with calcium with consequent increased degradation of the cement matrix.

scholarly journals The Interiority of Proximity Between Nature and Architecture in Contemporary and Tropically Context with Cases Studies

2019 ◽  
Author(s):  
Arteks Jurnal Teknik Arsitektur
Keyword(s):  
Information Technology ◽  
Case Studies ◽  
Temperature Difference ◽  
Air Conditioning ◽  
The Other ◽  
Asian Countries ◽  
Tropical Countries ◽  
Large Cities ◽  
Tropical Climates ◽  
The Relationship

The interiority of buildings in tropical countries requires specific characteristics unlike those in countries with four distinct seasons. Buildings in non-tropical climates must protect their inhabitants from extreme weather, meaning that the architecture’s connection with nature is necessarily limited by a boundary which can withstand extreme climatic differences. In tropical countries, on the other hand, the temperature does not fluctuate much throughout the year, so the temperature difference between seasons is not extreme. This characteristic is reflected in traditional Nusantara architecture, which incorporates a breathable wall so that free winds come in, reducing heat. The roof is tilted or saddled-shaped to keep rain water away from the building. The architecture uses organic materials and includes terraces for dialogue with nature. Modern Indonesian architecture, however, particularly in large cities, is mostly closed off, severely limiting the interaction with nature. Since the advent of air conditioning (AC) technology during the 1980’s, architecture has changed to seal the boundaries of the building. Advances in information technology such as Internet and smartphones have made for further changes to architecture in the area; some functional spaces are being discarded, while others are expanded. The relationship between architecture and nature is now constrained by impenetrable materials such as brick, concrete and glass, as opposed to the more traditional, permeable boundary. In contrast to this trend, modern Indonesian society is tempted to form a closer relationship with nature. This paper examines how a relationship between nature and the interior of buildings may be accommodated again, presenting some existing projects by several architects from Europe and Asian countries—including the authors’ own work—as case studies.

scholarly journals Studi Awal Pemanfaatan Kanal Jongaya dan Panampu Sebagai Transportasi Air di Kota Makassar

2019 ◽  
Vol 4 (2) ◽  
pp. 122
Author(s):  
Ahmad Dahlan ◽  
Slamet Trisutomo
Keyword(s):  
Swot Analysis ◽  
Urban Infrastructure ◽  
The Other ◽  
Feasibility Analysis ◽  
Transport Sector ◽  
Urban Drainage ◽  
Urban Water ◽  
Traffic Jam ◽  
The Relationship ◽  
The City

Perkembangan jumlah kendaraan yang pesat di kota Makassar tidak diimbangi oleh pembangunan infrastruktur perkotaan khususnya pada sektor transportasi sehingga menimbulkan kemacetan, oleh karena itu dibutuhkan langkah-langkah strategis untuk menyelesaikan permasalahan tersebut salah satunya dengan mengembangkan transportasi alternatif dengan melihat potensi yang ada. Kota Makassar memiliki kanal Jongaya dan Panampu yang letaknya berada ditengah kota, membelah kota Makassar dari utara hingga selatan dan berfungsi sebagai drainase perkotaan. Penelitian ini bertujuan untuk mengungkap potensi dan masalah pada kanal jongaya dan panampu dalam perspektif pemanfaatannya sebagai transportasi air perkotaan, dan juga melihat hubungannya dengan moda transportasi lainnya dengan menentukan titik perhentian atau halte pada jalur kanal. Analisis yang digunakan dalam penelitian ini yaitu analisis kelayakan pelayaran kanal, analisis SWOT untuk kondisi lingkungan kanal, dan analisis penentuan lokasi halte. Dari hasil analisis tersebut dihasilkan beberapa kesimpulan yang akan menjadi rekomendasi atau arahan yang harus dilakukan sebelum melakukan kegiatan perencanaan transportasi pada kanal jongaya dan panampu Kota Makassar.  The rapid growth in the number of vehicles in the city of Makassar is not matched by the development of urban infrastructure especially in the transport sector, causing traffic jam. Therefore, it takes strategic steps to resolve these problems, one of them by developing alternative transportation by seeing the potential that exists. Makassar has Jongaya and Panampu canal that is located in the center of the city, divides the city from north to south and serves as urban drainage. This study aims to uncover the potential and problems of the Panampu and Jongaya canal in perspective of it’s utilization as urban water transport, and also to see the relationship with the other transport modes by defining stop spots on the canal path.  The analysis used in this research are, feasibility analysis of the canal for shipping, SWOT analysis for the environmental contition of the canal, and siting analysis for stops location. From this analysis, produced some conclusions that will become a recommendation or a referral that must be followed prior to the transportation planning activities in Panampu and Jongaya canal in Makassar.

scholarly journals Meshness of sewer networks and its implications for flooding occurrence

2020 ◽  
Vol 81 (1) ◽  
pp. 40-51 ◽  
Author(s):  
Julian David Reyes-Silva ◽  
Björn Helm ◽  
Peter Krebs
Keyword(s):  
The Other ◽  
Urban Drainage ◽  
Sewer System ◽  
Data Set ◽  
Drainage Networks ◽  
Study Case ◽  
The One ◽  
Flooding Events ◽  
The Relationship ◽  
Sewer Networks

Abstract Understanding the factors that affect the occurrence of failures in urban drainage networks (UDNs) is a key concept for developing strategies to improve the reliability of such systems. Although a lot of research has been done in this field, the relationship between UDN structure (i.e. layout) and its functional failures is still unclear. In this context, the present study focuses first on determining which are the most common sewer layout topologies, based on a data set of 118 UDNs, and then on analyzing the relationship between these and the occurrence of node flooding using eight subnetworks of the sewer system of Dresden, Germany, as a study case. A method to ‘quantify’ the topology of a UDN in terms of similarity to a branched or meshed system, referred to as Meshness, is introduced. Results indicate, on the one hand, that most networks have branched or predominantly branched topologies. On the other hand, node flooding events in networks with higher Meshness values are less likely to occur, and have shorter durations and smaller volumes than in predominantly branched systems. Predominantly meshed systems are identified then as more reliable in terms of flooded nodes and flooding volumes.

scholarly journals The Interiority of Proximity Between Nature and Architecture in Contemporary and Tropically Context with Cases Studies

2019 ◽  
Vol 3 (2) ◽  
pp. 129
Author(s):  
Budi Pradono
Keyword(s):  
Information Technology ◽  
Case Studies ◽  
Temperature Difference ◽  
Air Conditioning ◽  
The Other ◽  
Asian Countries ◽  
Tropical Countries ◽  
Large Cities ◽  
Tropical Climates ◽  
The Relationship

The interiority of buildings in tropical countries requires specific characteristics unlike those in countries with four distinct seasons. Buildings in non-tropical climates must protect their inhabitants from extreme weather, meaning that the architecture’s connection with nature is necessarily limited by a boundary which can withstand extreme climatic differences. In tropical countries, on the other hand, the temperature does not fluctuate much throughout the year, so the temperature difference between seasons is not extreme. This characteristic is reflected in traditional Nusantara architecture, which incorporates a breathable wall so that free winds come in, reducing heat. The roof is tilted or saddled-shaped to keep rain water away from the building. The architecture uses organic materials and includes terraces for dialogue with nature. Modern Indonesian architecture, however, particularly in large cities, is mostly closed off, severely limiting the interaction with nature. Since the advent of air conditioning (AC) technology during the 1980’s, architecture has changed to seal the boundaries of the building. Advances in information technology such as Internet and smartphones have made for further changes to architecture in the area; some functional spaces are being discarded, while others are expanded. The relationship between architecture and nature is now constrained by impenetrable materials such as brick, concrete and glass, as opposed to the more traditional, permeable boundary. In contrast to this trend, modern Indonesian society is tempted to form a closer relationship with nature. This paper examines how a relationship between nature and the interior of buildings may be accommodated again, presenting some existing projects by several architects from Europe and Asian countries—including the authors’ own work—as case studies.

scholarly journals Relationships among wood anatomy, hydraulic conductivity, density and shear parallel to the grain in the wood of 24-year-old Handroanthus vellosoi (Bignoniaceae)

Rodriguésia ◽  
2017 ◽  
Vol 68 (4) ◽  
pp. 1217-1224
Author(s):  
Eduardo Luiz Longui ◽  
Ivanka Rosada de Oliveira ◽  
Ryan Combs Graebner ◽  
Miguel Luiz Menezes Freitas ◽  
Sandra Monteiro Borges Florsheim ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hydraulic Conductivity ◽  
Water Transport ◽  
Wood Anatomy ◽  
The Other ◽  
Mechanical Resistance ◽  
Water Conductivity ◽  
Trade Offs ◽  
Thick Disks ◽  
The Relationship

Abstract We studied the relationships among wood anatomy, hydraulic conductivity, density and shear parallel to the grain in the stem of Handroanthus vellosoi trees with the goal to identify possible trade-offs between hydraulic conductivity and mechanical properties. For this study we felled 12 trees with 24-year-old and cut 10-cm-thick disks at three heights: base of the trunk, one meter in height, and two meters in height. We propose that the relationship between hydraulic conductivity and mechanical resistance found along the H. vellosoi trunk indicates greater mechanical investment in the wood at the base of the trunk compared with the other two heights (1 and 2 meters). Anatomically, this would be represented by smaller diameter vessels and fibers with thicker walls. Consequently, strength investment implies lower water conductivity at the stem base. However, more studies are needed to determine whether this lower value with respect to 1 and 2 meters represents a significant effect on water transport along the stem.

Non-Destructive Tests for the Assessment of R.C. Buildings

2021 ◽  
Author(s):  
Mariella Diaferio ◽  
Michele Vitti
Keyword(s):  
Compressive Strength ◽  
The Other ◽  
Compression Tests ◽  
Concrete Compressive Strength ◽  
Building Stock ◽  
Safety Level ◽  
Calibration Process ◽  
The Relationship ◽  
Non Destructive ◽  
Test Scenarios

Abstract During the recent decades, the use of non-destructive tests has reached greater attention due to its high versatility and the possibility of extending the investigations on a great number of points. On the other side, the existence of a wide building stock realized in reinforced concrete, which is reaching the end of its service life, has increased the research on the assessment of their safety level. In this field, one of the most important parameters for r.c. structure is the concrete compressive strength, which “classically” is evaluated by means of compression tests on drilled cores. However, usually the extension of such procedure to a high number of points is quite difficult due to logistic and economic reasons. The use of non-destructive tests may overcome these limits, but still needs further investigations to improve the calibration process of the relationship between the acquired data and the compressive strength. The present paper deals with this issue and discusses the results of the investigations on r.c. buildings in Bari (Italy) which make use of both destructive and non-destructive tests. The data are analyzed by considering several test scenarios and by evaluating the variability of parameters related to the calibration process.

scholarly journals Wood hydraulic characteristics of pioneers/early secondary and non-pioneer species

2021 ◽  
Vol 14 (7) ◽  
pp. 45-52
Author(s):  
Ana Tereza Durão Galão ◽  
Diego Romeiro ◽  
Luís Alberto Bucci ◽  
Guillermo Angeles ◽  
Eduardo Luiz Longui
Keyword(s):  
Regression Analysis ◽  
Hydraulic Conductivity ◽  
Moisture Content ◽  
Wood Density ◽  
The Other ◽  
Pioneer Species ◽  
Hydraulic Characteristics ◽  
Cariniana Legalis ◽  
Guazuma Ulmifolia ◽  
The Relationship

We aimed to determine any differences in hydraulic conductivity between pioneer species/early secondary and non-pioneers. To make this determination, we measured maximum vessel length (Mvl), specific hydraulic conductivity (Ks), percentage of embolized vessels (Pev), leaf hydraulic conductivity (Kl) and wood density at equilibrium moisture content-12% (Wd12). The pioneer/early secondary species we examined were Guazuma ulmifolia, Inga marginata and Maclura tinctoria. The non-pioneers we examined were Paubrasilia echinata, Cariniana legalis and Myroxylon peruiferum. The results were submitted to statistical analyses, including multiple comparison tests and t test, to verify differences between successional groups and regression analysis to verify the relationship between Ks and the other variables. Pioneer species had higher Ks than non-pioneers. Non-pioneers had a higher percentage of embolized vessels and wood density. Successional groups did not differ in Mvl, which is positively related to hydraulic conductivity in both successional groups since the percentage of embolized vessels was related negatively. Wood density is positively related to Ks in non-pioneer species, while a negative correlation was observed between Ks and Kl in the pioneer species.

scholarly journals Properties of the northern red oak (Quercus rubra L.) wood determined by fractometric measurements - preliminary results

2021 ◽  
pp. 125-136
Author(s):  
Ivana Zivanovic ◽  
Filip Jovanovic ◽  
Nenad Surjanac ◽  
Nebojsa Todorovic ◽  
Goran Milic
Keyword(s):  
Compressive Strength ◽  
Multiple Regression ◽  
Bending Strength ◽  
The Other ◽  
Red Oak ◽  
Northern Red Oak ◽  
Oak Wood ◽  
Preliminary Results ◽  
The Core ◽  
The Relationship

This study presents preliminary results of the basic properties of the northern red oak wood as well as the relationship between the properties of the core samples obtained on the live tree and the tested properties. The core samples 5 mm in diameter were extracted from the tree and used for determining the fractometer properties: compressive strength parallel to grain, radial bending strength and braking angle. Using descriptive statistics and multiple regression, the relationship between fractometric parameters and basic physical and mechanical properties of wood determined by destructive methods (wood density, compressive strength in parallel with fibers and bending properties (bending strength and modulus of elasticity). The obtained values of the examined properties of northern red oak are within the limits of the literature data. Statistical analysis has shown that radial bending strength cannot be used as a reliable fractometric parameter in assessing wood quality. On the other hand, the obtained results suggest that the relationship between the other two parameters (compressive strength parallel to grain and fracture angle) and the properties of the northern red oak wood can be successfully described using the multiple regression models (coefficient of determination ranged from 0.945 to 0.990).

Sign in / Sign up

Export Citation Format

Share Document