scholarly journals The Influence of Lime Solution in Kneading Water Substitution on Cement Roughcast and Mortar Coating

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4174
Author(s):  
André M. Santos ◽  
Ângelo J. Costa e Silva ◽  
João M. F. Mota ◽  
João M. P. Q. Delgado ◽  
Fernando A. N. Silva ◽  
...  
Keyword(s):  
Bond Strength ◽  
Concrete Block ◽  
Tensile Bond Strength ◽  
Water Penetration ◽  
Strength Tests ◽  
Lime Solution ◽  
Concrete Blocks ◽  
Materials Used ◽  
Bonding Systems ◽  
Direct Tensile

The understanding of the mechanical fixation behavior of coatings is crucial for a better comprehension of the bonding systems, especially at the interface between the mortar and the substrate. Physical adherence is related, among other things, to the contents of the materials used in the roughcast and mortar coatings, due to the colloidal water penetration into the pores of the substrate. This work evaluated the influence of different lime solution additions replacing the kneading water in the preparation of roughcast and mortar coatings. Two types of substrates were investigated:ceramic bricks and concrete blocks. Three wall masonry panels were constructed, with dimensions of 220 × 180 cm2, one of concrete block and two of ceramic bricks, followed by the application of roughcast and mortar coating with an average thickness of 5 mm and 20 mm, respectively. Direct tensile bond strength tests were performed and the results, with a 95% confidence level, showed that substrate ceramic and treatment in the roughcast exhibited a better behavior regarding the distribution of the tensile bond strength of the tested specimens. However, no significant differences of the amount of addition used (0%, 5%, 10% and 15%) on the tensile bond strength were observed.

Influence of the Mineralogical and Mortar Components on the Adherence of Some “Granites”

2013 ◽  
Vol 548 ◽  
pp. 267-274 ◽  
Author(s):  
Lizandra Nogami ◽  
Antenor B. Paraguassú ◽  
José E. Rodrigues ◽  
Rogério P. Ribeiro
Keyword(s):  
Bond Strength ◽  
Single Crystals ◽  
Rough Surface ◽  
Tensile Bond Strength ◽  
Polished Surface ◽  
Optical Orientation ◽  
Adhesion Bond ◽  
Strength Tests ◽  
Mineral Components ◽  
Traction Test

Rock plate setting can be performed with metal inserts or by mortar adhesion. For mortar setting, the adhesion bond strength values, as a rule, should be above 1 MPa. In the present work, tests with eight types of “granite” tiles were performed to compare the adherence of five types of mortars. The rocks chosen were: Red Brasilia (syenogranite), Black Indian (migmatite), Green Labrador (charnockite), Black Sao Gabriel (hypersthene diorite), Rose Jacaranda (nebulitic migmatite syenogranite), Fantastic Blue (biotite monzogranite megaporphyritic serial gneissified), Grey Swallow (monzogranite) and Yellow Ornamental (garnet porphyroblastic gneiss), which do not have similar petrographic and sawability characteristics, thereby resulting in different initial roughness values of the plates obtained by breaking apart the blocks on the gangsaw machine, which use granulated steel as an abrasive element. The adherence of these rocks with the mortars was determined in the rough surface as well as in the polished surface by the pullout traction test, standardized for ceramics. The results showed that the mortar adhesion is related to roughness, to mineralogy and to the texture of these rocks. To verify this relationship, tensile bond strength tests were performed with the main mineral components of these rocks using single crystals with known optical orientation. Moreover, the microstructure study of the standard substrate/mortar/rock set was also performed.

scholarly journals Study of brazilian structural concrete block conformity

2018 ◽  
Vol 11 (4) ◽  
pp. 652-672
Author(s):  
W. C. SANTIAGO ◽  
A. T. BECK
Keyword(s):  
Compressive Strength ◽  
Dimensional Analysis ◽  
Concrete Block ◽  
Structural Concrete ◽  
Class A ◽  
Masonry Construction ◽  
Strength Tests ◽  
Concrete Blocks

Abstract This paper presents a study of the conformity of structural concrete blocks manufactured and used in masonry construction in Brazil. It is based on compressive strength tests, on dimensional analysis and absorption tests of over six thousand samples from three classes (A, B and C) and two modular sizes (M-15 and M-20). National results show that blocks tend to have an estimated compressive strength higher than specified, except blocks from class A. Regional results show that blocks manufactured in the northeast (NE) are consistently non-conforming, for all block classes. The study also shows that dimensional variations and absorption tests results are within code tolerances.

scholarly journals Imagistic Evaluation of the Orthodontics Interfaces

2013 ◽  
Vol 8-9 ◽  
pp. 317-326
Author(s):  
Cosmin Sinescu ◽  
Adrian Manescu ◽  
Meda Lavinia Negrutiu ◽  
Mihai Rominu ◽  
Liviu Marşavina ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Bond Strength ◽  
Shear Bond Strength ◽  
Tensile Bond Strength ◽  
Scientific Interest ◽  
Surface Conditioning ◽  
Strength Tests ◽  
Artificial Surface ◽  
Bracket Base ◽  
Destructive Methods

In orthodontics, the scientific interest regarding adhesion is focused on optimizing adherents: metallic or aesthetic bracket base conditioning, creating aesthetic brackets with improved mechanical properties, enamel conditioning and artificial surface conditioning (aesthetic veneers and crowns). In order to investigate the interfaces between adherents there are several invasive (destructive) methods such as tensile bond strength tests, shear bond strength tests and microleakage tests.

scholarly journals Studies on tensile bond strength tests for dental cements. Relationship between measurement conditions and tensile bond strength.

1985 ◽  
Vol 27 (1) ◽  
pp. 1-12
Author(s):  
Misaki ANZAI ◽  
Hideharu HIROSE ◽  
Takahiko IMAMURA ◽  
Tatsumasa TAKAHASHI ◽  
Masayoshi OHASHI
Keyword(s):  
Bond Strength ◽  
Tensile Bond Strength ◽  
Strength Tests

scholarly journals Thermal and Mechanical Studies of Perlite Concrete Casing for Chimneys in Residential Buildings

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2011
Author(s):  
Krzysztof Drozdzol
Keyword(s):  
Fire Safety ◽  
Building Materials ◽  
Residential Buildings ◽  
Concrete Block ◽  
Test Results ◽  
Safety Level ◽  
Current Trends ◽  
Concrete Blocks ◽  
High Insulation ◽  
Materials Used

Chimneys are structures designed to convey exhaust gases from heating devices to the outside of buildings. The materials from which they are made have a great impact on their fire safety, as well as on the safety of the whole building. As current trends in the construction industry are moving towards improving the environmental impact and fire safety, changes to building materials are constantly being introduced. This also applies to the development of chimney technology, as there is still a recognised need for new solutions when it comes to materials used in the production of chimney systems. This article presents the findings of tests carried out on a chimney made from innovative perlite concrete blocks. Four different perlite concrete blocks that differed in bulk densities were analysed. The obtained results were then compared with widely used leca (lightweight expanded clay aggregate) concrete blocks. The test results confirmed high insulation properties of the perlite concrete block, from which the innovative chimney casing was made. The fire safety level was maintained even in high temperatures that occur during soot fire (1000 °C). These properties were retained despite there being no additional insulation of the flue duct. Even though the thermal load decreased the compressive strength of the chimney blocks, they still displayed sufficient average strength of 4.03 MPa. Additionally, the test results confirmed the possibility of recovering heat from the chimney with the efficiency of 23–30%, which constitutes a considerable increase compared to chimneys made from leca concrete blocks.

scholarly journals Humidity and specimen preparation procedure: influence on compressive strength of concrete blocks

2021 ◽  
Vol 14 (2) ◽  
Author(s):  
Guilherme Aris Parsekian ◽  
André Luis Christoforo ◽  
Amanda Duarte Escobal Mazzú ◽  
Gláucia Maria Dalfré
Keyword(s):  
Compressive Strength ◽  
Concrete Block ◽  
Block Type ◽  
Specimen Preparation ◽  
Standard Procedures ◽  
Strength Tests ◽  
Concrete Blocks ◽  
Compressive Strength Of Concrete ◽  
Average Block ◽  
Best Fit

abstract: It is extremely important that the quality control of the concrete block used in structural masonry is conducted based on standard procedures that allow reliable estimation of the properties of these components. This work aims to analyze and evaluate the influence of the concrete block moisture on the result of the compression test. Hollow concrete blocks were prepared and subsequently maintained in different environments for various periods of time and under different conditions of temperature and humidity to determine the influence of the type of drying on the relative humidity of the block at the time of testing and consequently on its compressive strength. As a conclusion, it can be stated that, because it is necessary to use water in the process, the grinding rectification of the faces of the blocks led them to have high humidity, above 70%. If tested in this condition, the results of the compressive strength tests will be lower than that of blocks under usual environmental conditions. No differences were found in the average block strength when they were kept dry in the controlled environment of the laboratory during periods of 24 or 48 h. After grinding, it is not necessary to dry the blocks inside an oven at 40ºC before the tests; simply leaving them at a usual room temperature of 23ºC and humidity of 40 ± 5% for 24h is sufficient. The attempt to accelerate drying in an oven at 100ºC is not adequate because this leads to an increase in the compressive strength. From the results, it was possible to determine expressions to correlate the compressive strength as a function of the moisture of the block at the time of the test. The best-fit expressions are distinct for each block type, but the formulations are consistent in indicating a considerable difference in resistance as a function of moisture.

scholarly journals Effect of air abrasion on tensile bond strength of a single-bottle adhesive/indirect composite system to enamel

2007 ◽  
Vol 18 (1) ◽  
pp. 45-48 ◽  
Author(s):  
Paulo César G. Silva ◽  
Mariane Gonçalves ◽  
Telma N. do Nascimento ◽  
André Luiz B. Centola
Keyword(s):  
Phosphoric Acid ◽  
Bond Strength ◽  
Adhesive System ◽  
Tensile Bond Strength ◽  
Air Abrasion ◽  
Human Enamel ◽  
Significant Difference ◽  
Strength Tests ◽  
Indirect Composite ◽  
Phosphoric Acid Etching

This study evaluated the efficiency of air abrasion alone and associated with phosphoric acid etching on tensile bond strength of a single-bottle adhesive/indirect composite restorative system (Bond 1/Alert) to human enamel. Forty enamel surfaces from extracted human third molars were assigned to 4 groups (n= 10). Mach 4.1 (Kreativ Inc.) air abrasion equipment was used for 20 s. A special system of rod pairs aligned in a specific apparatus was used for tensile strength tests, according to ISO/TR 11405 standard (1994) with some modifications. Bond strength means were: G1 (air abrasion + rinsing + condensable composite resin Alert) = 3.46 ± 0.83 MPa; G2 (air abrasion + rinsing + Bond 1 adhesive system + Alert) = 4.00 ± 1.60 MPa; G3 (air abrasion + rinsing + 37% phosphoric acid + rinsing + Bond 1 + Alert) = 20.80 ± 3.95 MPa; and G4 (37% phosphoric acid + rinsing + Bond 1 + Alert) = 17.00 ± 2.74 MPa. The statistical analysis by Kruskal-Wallis test revealed that G1 and G2 presented statistically significant difference (p< 0.05) from G3 and G4 (p<0.01) and G1 and G3 did not differ significantly (p> 0.05) from G2 and G4, respectively.

scholarly journals Tensile Bond Strength and Adaptability of One-bottle One-step Bonding Systems to Dental Hard Tissues Irradiated by Er:YAG Laser

2015 ◽  
Vol 26 (1) ◽  
pp. 17-27
Author(s):  
Naohiro IWATA ◽  
Keita YOKOTA ◽  
Youhei HIROTA ◽  
Kenzo YASUO ◽  
Kazushi YOSHIKAWA ◽  
...  
Keyword(s):  
Bond Strength ◽  
Er:Yag Laser ◽  
Tensile Bond Strength ◽  
Dental Hard Tissues ◽  
Hard Tissues ◽  
One Step ◽  
Bonding Systems

Influence of Lime Solution on the Bonding Strength of a Mortar Coating Base

2019 ◽  
Vol 24 ◽  
pp. 1-10
Author(s):  
A.C. Azevedo ◽  
A.J. Costa e Silva ◽  
J.M.P.Q. Delgado ◽  
F.M. Vieira ◽  
M.T.G. Souza
Keyword(s):  
Bond Strength ◽  
Bonding Strength ◽  
Base Material ◽  
Ceramic Plate ◽  
Decorative Element ◽  
Ornamental Stones ◽  
Lime Solution ◽  
Mechanical Bond ◽  
Direct Tensile ◽  
Covering Systems

Mortar bond covering systems are multilayered and applied to a base, composed of render mortars (stucco, plaster) followed by some decorative element for a finishing touches (paint, ceramic plate, ornamental stones, etc.). In order to homogenize the characteristics of the base material and to increase the bond with the render mortar, it is a common practice to apply some type of preparation, either an even, smooth solution such as wetting the walls, or roughened solution utilizing roughcast. Studies have shown that the presence of calcium ions in ceramic bases results in the formation of a more dense crystalline structure at the interface, which culminates with higher mechanical bond strength. In this light, the present study presents an experimental investigation, the purpose of which is to evaluate, in a comparative way, the direct tensile strength of bond of a mortar coating applied to the same base, preceded in its application by five different preparation techniques. It can be concluded from this study that the preparation of the mortar base is of fundamental importance for bonding strength and, therefore, the addition of a lime solution to the roughcast is economically feasible and a satisfactory alternative in order to obtain positive results in environments where bond strength is critical.

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