scholarly journals Determinación de las propiedades térmicas de un mortero modificado con sargazo como material alternativo en construcción

2019 ◽  
pp. 1-9
Author(s):  
Alberto Zavala-Arceo ◽  
Julio César Cruz-Argüello ◽  
Mayra Zyzlila Figueroa-Torres ◽  
Alberto Yeladaqui-Tello
Keyword(s):  
Mechanical Properties ◽  
Construction Industry ◽  
Thermal Load ◽  
Thermal Transfer ◽  
Hardening Process ◽  
Sustainable Materials ◽  
Compression Resistance ◽  
Resistance Tests ◽  
Reducing Energy

In the present work we analyze the properties of a mortar with the addition of treated sargassum algae, replacing the stone aggregate in percentages of 5%, 10%, 15% and 20% in order to reduce the thermal conductivity of the coating and the thermal load of the interior of the buildings, thus reducing energy consumption and implementing sustainable materials to the construction industry. For the purposes of this investigation, a characterization of the components of the mortar was carried out, the stone aggregate and the sargassum treated for its use as an aggregate. Samples were prepared for each percentage and compression resistance tests were performed at 3, 7, 14 and 28 days to analyze the behavior of the mortar during the hardening process. Adhesion tests were performed to determine if the mixtures are efficient for use as a coating. Subsequently, the thermal transfer was evaluated by conduction and convection. The material showed hydrophilic characteristics, therefore, the analysis of the mechanical properties showed as bigger substitution of sargassum, low is the resistance, limiting the efficient percentages to 5 and 10% for its use.

scholarly journals Recycling Construction and Demolition Residues in Clay Bricks

2021 ◽  
Vol 11 (19) ◽  
pp. 8918
Author(s):  
Chiara Zanelli ◽  
Elena Marrocchino ◽  
Guia Guarini ◽  
Alice Toffano ◽  
Carmela Vaccaro ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Environmental Impact ◽  
Construction Industry ◽  
Mineralogical Composition ◽  
Processing Plant ◽  
Fine Grained ◽  
Technical Performance ◽  
Clay Bricks ◽  
Compositional Properties

In recent years, the management of construction and demolition residues (CDRs) has become a major challenge for the construction industry due to the increasing volume of waste produced and its associated environmental impact. The aim of this article is to assess the effect of fine-grained fractions (<0.125 mm–0.6–0.125 mm) of construction and demolition residues, obtained by industrial sorting in a CDR processing plant in Rovigo (Italy), on the technological behavior and technical performance of clay bricks. Simulating the brickmaking process on a laboratory scale, it was appraised whether the CDR additions determined any change in the main properties of both fired and unfired bricks, taking a CDR-free brick body as a reference. The results indicated that the use of CDR is technologically feasible. It is possible to obtain, through proper crushing and sorting operations, grain-sized fractions with quite homogenous chemical and mineralogical composition. The residues did affect the compositional properties, porosity and water absorption of the clay bricks. Nevertheless, the characterization of the residual-added semi-finished and fired products highlighted their good technological and mechanical properties, which allowed them to provide performances similar to those of standard bricks manufactured with raw natural materials.

scholarly journals Influence of the Cooling Rate on the Morphology of Spheroidic Graphite Obtained by the CO2 Process

2013 ◽  
Vol 8 (22) ◽  
pp. 37
Author(s):  
Mauro Carlos Souza ◽  
Antonio Carlos de Araújo Santos ◽  
Wilma Clemente de Lima Pinto ◽  
Mila Rosendal Avelino
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Chemical Analysis ◽  
Cooling Rate ◽  
Processing Parameters ◽  
Mechanical Resistance ◽  
Metallic Materials ◽  
Metallurgical Processing ◽  
Resistance Tests

The mechanical properties of cast metallic materials are strongly influenced by processing parameters, such as percentage of silicate, sand granulometry, and metallurgical processing. The ductile iron cast produced by the CO2 process depends on variables that determine the behavior of the material in service, such as the cooling rate and chemical composition. This study evaluated the influence of the cooling rate on the spheroidic graphite. In order to determine this effect, a simulation was performed in specimens with 20, 25, and 30 mm in thickness, through the characterization of type, measurement of nodule size, and distribution of nodules. Chemical analysis and mechanical resistance tests were performed. The 25 mm thick specimen showed the best behavior among the three thicknesses evaluated, presenting the formation of many small nodules and a small amount of larger nodules in the center.

MECHANICAL PROPERTIES OF HYBRID FIBRES REINFORCED POLYMER MODIFIED MORTAR IN PROMOTING SUSTAINABLE MATERIALS IN CONSTRUCTION

2020 ◽  
Vol 6 (1) ◽  
pp. 1
Author(s):  
Azamuddin Husin ◽  
Mahyuddin Mahyuddin ◽  
Cheah Chee Ban
Keyword(s):  
Mechanical Properties ◽  
Construction Industry ◽  
Natural Fibre ◽  
Reinforced Polymer ◽  
Hybrid Fibre ◽  
Fibre Reinforced Polymer ◽  
Sustainable Materials ◽  
Curing Regimes ◽  
Durability Performance ◽  
Significant Increment

Fibre reinforced polymer modified mortar (PMM) was widely accepted for multipurpose application in construction industry. However the use of natural fibre in cementitious material in terms of durability performance was not encouraging. This paper aims to investigate the mechanical properties of the hybrid fibre namely kenaf, polypropylene and bar chip in polymer modified mortar with a low water-cement ratio. The results concluded that the hybridisation of 0.4% kenaf, 0.6% polypropylene and 0.6% bar chip (G sample) exhibited the significant increment of compressive and flexural strength for both curing regimes.

Effect of Curing Age on the Compressive Strength of Petrovege Blocks

2014 ◽  
Vol 980 ◽  
pp. 91-96
Author(s):  
O.A. Johnson ◽  
Napiah Madzlan ◽  
Ibrahim B. Kamaruddin
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Construction Industry ◽  
Construction Materials ◽  
Sustainable Construction ◽  
Liquid Content ◽  
Minimum Requirements ◽  
Sustainable Materials ◽  
Crude Oil Sludge ◽  
Curing Age

In the recent years there has been an intensification of policies on sustainable construction materials in the construction industry. This environmental policy has brought about development of various sustainable materials in which Petrovege blocks is one of the outstanding products. This paper investigates the effect of curing age on the compressive strength of the product. Block samples were prepared by adding 8%, 9%, 10%, 11%, 12%, and 13% liquid content of the mixture of vegetable oil and crude oil sludge as a binder after the optimum liquid content has been established. The specimens were cured at different period of time of 48hrs, 72hrs, 96hrs, and 120hrs. Mechanical properties of the products were evaluated. Compressive strength of Petrovege samples varies from 5.31 N/mm2to 18.88 N/mm2indicating that the compressive strength increases with increase in curing age, while decrease in porosity leads to increased compressive strength for the stipulated curing ages. All samples satisfied the minimum requirements in terms of compressive strength, in accordance with all available standards.

scholarly journals Influence of the Cooling Rate on the Morphology of Spheroidic Graphite Obtained by the CO2 Process

2013 ◽  
Vol 8 (22) ◽  
pp. 37-41
Author(s):  
Mauro Carlos Souza ◽  
Antonio Carlos de Araújo Santos ◽  
Wilma Clemente de Lima Pinto ◽  
Mila Rosendal Avelino
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Chemical Analysis ◽  
Cooling Rate ◽  
Processing Parameters ◽  
Mechanical Resistance ◽  
Metallic Materials ◽  
Metallurgical Processing ◽  
Resistance Tests

The mechanical properties of cast metallic materials are strongly influenced by processing parameters, such as percentage of silicate, sand granulometry, and metallurgical processing. The ductile iron cast produced by the CO2 process depends on variables that determine the behavior of the material in service, such as the cooling rate and chemical composition. This study evaluated the influence of the cooling rate on the spheroidic graphite. In order to determine this effect, a simulation was performed in specimens with 20, 25, and 30 mm in thickness, through the characterization of type, measurement of nodule size, and distribution of nodules. Chemical analysis and mechanical resistance tests were performed. The 25 mm thick specimen showed the best behavior among the three thicknesses evaluated, presenting the formation of many small nodules and a small amount of larger nodules in the center.

Evaluation of Incorporation of a Leather Waste Powder in Mortars for Construction Industry

2015 ◽  
Vol 820 ◽  
pp. 558-563
Author(s):  
Victor Roberto Verga Mendes ◽  
Rita de Cássia S. Sant’ana Alvarenga ◽  
Charles Luis da Silva ◽  
José Maria Franco de Carvalho ◽  
Ana Augusta Passos Rezende ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Construction Industry ◽  
Alkaline Solution ◽  
Hydrated Lime ◽  
Technical Feasibility ◽  
Flow Table ◽  
Resistance Tests ◽  
Adherence Strength ◽  
Processed Waste

This paper has the objective to evaluate the technical feasibility of incorporation of leather powder in mortars. First a physical characterization of aggregate was carried and then preceded to the dissolution of the leather powder in alkaline solution, in the proportion of 1:1:1 of waste, alkaline solution and water respectively, obtaining the processed waste. In the next step, it has been molded specimen using two reference recipes in terms of mass, 1:3 of cement and sand, and 1:1:6 of cement, hydrated lime and sand respectively, keeping constant the flow table consistency of 130 ±10 mm and 220±10 mm, for each respectively recipe. Two groups of mortars were produced: one without processed waste, one with 5% and one with 10% in ratio to the cement mass. Tests had been carried such as compressive strength to axial compression, tensile strength to diametrical compression, and adherence strength on surfaces. The resistance tests performed; also the analyses of the leachate and solubilized extracts confirmed the feasibility of incorporation of leather powder in mortars.

Microstructural and fractographic characterization of B4C-Al cermets tested under dynamic and static loading

1989 ◽  
Vol 47 ◽  
pp. 562-563
Author(s):  
Gyeung Ho Kim ◽  
Mehmet Sarikaya ◽  
D. L. Milius ◽  
I. A. Aksay
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Fracture Toughness ◽  
Static Loading ◽  
Carbon Deposition ◽  
Full Density ◽  
Unique Combination ◽  
Strong Component ◽  
Reaction Products

Cermets are designed to optimize the mechanical properties of ceramics (hard and strong component) and metals (ductile and tough component) into one system. However, the processing of such systems is a problem in obtaining fully dense composite without deleterious reaction products. In the lightweight (2.65 g/cc) B4C-Al cermet, many of the processing problems have been circumvented. It is now possible to process fully dense B4C-Al cermet with tailored microstructures and achieve unique combination of mechanical properties (fracture strength of over 600 MPa and fracture toughness of 12 MPa-m1/2). In this paper, microstructure and fractography of B4C-Al cermets, tested under dynamic and static loading conditions, are described.The cermet is prepared by infiltration of Al at 1150°C into partially sintered B4C compact under vacuum to full density. Fracture surface replicas were prepared by using cellulose acetate and thin-film carbon deposition. Samples were observed with a Philips 3000 at 100 kV.

Characterization of interfaces in CVD-coated nicalon fiber-reinforced SiC

1989 ◽  
Vol 47 ◽  
pp. 556-557
Author(s):  
K.L. More ◽  
R.A. Lowden
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Chemical Vapor ◽  
Chemical Vapor Infiltration ◽  
Frictional Stress ◽  
Fiber Reinforced ◽  
Pull Out ◽  
Carbon Coated ◽  
Fiber Matrix

The mechanical properties of fiber-reinforced composites are directly related to the nature of the fiber-matrix bond. Fracture toughness is improved when debonding, crack deflection, and fiber pull-out occur which in turn depend on a weak interfacial bond. The interfacial characteristics of fiber-reinforced ceramics can be altered by applying thin coatings to the fibers prior to composite fabrication. In a previous study, Lowden and co-workers coated Nicalon fibers (Nippon Carbon Company) with silicon and carbon prior to chemical vapor infiltration with SiC and determined the influence of interfacial frictional stress on fracture phenomena. They found that the silicon-coated Nicalon fiber-reinforced SiC had low flexure strengths and brittle fracture whereas the composites containing carbon coated fibers exhibited improved strength and fracture toughness. In this study, coatings of boron or BN were applied to Nicalon fibers via chemical vapor deposition (CVD) and the fibers were subsequently incorporated in a SiC matrix. The fiber-matrix interfaces were characterized using transmission and scanning electron microscopy (TEM and SEM). Mechanical properties were determined and compared to those obtained for uncoated Nicalon fiber-reinforced SiC.

PREPARATION AND CHARACTERIZATION OF REPROCESSED COMPOSITES OF POLYPROPYLENE REINFORCED BY WOOD FIBERS: PHYSICAL AND MECHANICAL PROPERTIES

2017 ◽  
Author(s):  
Thais Helena Sydenstricker Flores-Sahagun ◽  
Kelly Priscila Agapito ◽  
ROSA MARIA JIMENEZ AMEZCUA ◽  
Felipe Jedyn
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Wood Fibers
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