The Effect of Normal Adhesion on the Strength of a Cellular Concrete, Including Seismic Input

2020 ◽  
pp. 69-83
Author(s):  
Dmitriy N. Vartanov
Keyword(s):  
Seismic Input ◽  
Normal Adhesion ◽  
Cellular Concrete

Increasing the Monolithic Nature of Masonry Made of Cellular Concrete Blocks by Using Polyurethane Foam Glue as a Masonry Mortar

2020 ◽  
Vol 786 (11) ◽  
pp. 4-9
Author(s):  
DZHAMUEV B.K. ◽  
Keyword(s):  
Compressive Strength ◽  
Polyurethane Foam ◽  
Research University ◽  
The Body ◽  
Axial Tension ◽  
Reinforced Masonry ◽  
Concrete Blocks ◽  
Normal Adhesion ◽  
Axial Stretching ◽  
Cellular Concrete

This study is a continuation of previously published work [1]. The results of experimental determination of the strength of normal adhesion (under axial tension) in masonry made of autoclave–hardened cellular concrete blocks of compressive strength classes B1,5-B3,5 on cement mortars and polyurethane foam adhesives are presented. The tests were carried out in the laboratory of the Department “Reinforced Concrete and Stone Structures” of the Moscow State University of Civil Engineering (National Research University). The experiment was carried out on samples-cubes with a size of 150x150x150 mm, which were cut out of cellular concrete blocks, fastened (glued) together using masonry (binding) compositions. In the course of the study, it was found that when using various polyurethane foam glue compositions in masonry made of cellular concrete blocks of compressive strength classes B1,5–B3,5, the resistance to axial stretching over an unbound section (normal adhesion) of the masonry increases by approximately 9–25%. It was also found that the nature of the destruction of samples made on polyurethane foam adhesives (destruction occurs along the body of concrete), indicates the monolithic nature of the masonry. The analysis of the results obtained makes it possible to conclude that the resistance to axial tension along the unbound section of the masonry depends on the strength of the material from which the block is made, and not on the compressive strength of the masonry (binder) mortar used, as indicated in table 11 of SP 15.13330.2012 “Stone and reinforced masonry structures”. This factor must be taken into account when calculating masonry from autoclave-hardened cellular concrete blocks on polyurethane foam compositions.

Technological features of manufacturing of dispersion-reinforced cellular concrete

2020 ◽  
pp. 118-131
Author(s):  
Valeriy Strotskiy ◽  
◽  
Sergey Zimin ◽  
Aleksey Krokhin ◽  
Valentina Stepanova ◽  
...  
Keyword(s):  
Cellular Concrete

scholarly journals Characteristics of Lightweight Cellular Concrete and Effects on Mechanical Properties

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2678 ◽  
Author(s):  
Wei Yu ◽  
Xu Liang ◽  
Frank Mi-Way Ni ◽  
Abimbola Grace Oyeyi ◽  
Susan Tighe
Keyword(s):  
Mechanical Properties ◽  
Pore Structure ◽  
High Definition ◽  
Pore Characteristics ◽  
Software Applications ◽  
Solid Part ◽  
Electron Microscopes ◽  
Lab Test ◽  
Scanning Electron Microscopes ◽  
Cellular Concrete

This study investigated the pore structure and its effects on mechanical properties of lightweight cellular concrete (LCC) in order to understand more and detailed characteristics of such structure. As part of investigation, environment scanning electron microscopes (ESEM) and industrial high-definition (HD) macro photography camera were separately used to capture and compare images of specimens. Physical properties of the pore structure, including pore area, size, perimeter, fit ellipse, and shape descriptors, were studied based on the image processing technology and software applications. Specimens with three different densities (400, 475, and 600 kg/m3) were prepared in the laboratory. Firstly, the effects of density on the characteristics of pore structure were investigated; furthermore, mechanical properties (compressive strength, modulus of elasticity and Poisson’s ratio, flexural strength and splitting tensile strength of LCC) were tested. The relationships among pore characteristics, density, and mechanical properties were analyzed. Based on the results obtained from the lab test—comparisons made between specimens with high-densities and those with low-densities—it was found significant variability in bubble size, thickness, and irregularity of pores. Furthermore, the increase of density is accompanied by better mechanical properties, and the main influencing factors are the thickness of the solid part and the shape of the bubble. The thicker of solid part and more regular pores of LCC has, the better mechanical properties are.

scholarly journals The extracellular matrix gene Frem1 is essential for the normal adhesion of the embryonic epidermis

2004 ◽  
Vol 101 (37) ◽  
pp. 13560-13565 ◽  
Author(s):  
I. Smyth ◽  
X. Du ◽  
M. S. Taylor ◽  
M. J. Justice ◽  
B. Beutler ◽  
...  
Keyword(s):  
Extracellular Matrix ◽  
Matrix Gene ◽  
Normal Adhesion

Development of a new class of precast concrete pipes - an experimental evaluation

2007 ◽  
Vol 34 (7) ◽  
pp. 885-889 ◽  
Author(s):  
H El Naggar ◽  
E N Allouche ◽  
M H. El Naggar
Keyword(s):  
Experimental Evaluation ◽  
Solid Wall ◽  
Research Effort ◽  
Precast Concrete ◽  
Load Test ◽  
Added Value ◽  
Structural Performance ◽  
Concrete Pipes ◽  
Concrete Pipe ◽  
Cellular Concrete

Concrete pipes represent the backbone of the municipal storm and wastewater collection systems of Ontario, Canada. Industry and academia partnered on a research effort that aimed at developing new precast-concrete pipe products that provide added value to the final user in comparison with existing products. This paper describes a full-scale experimental evaluation of the design, manufacturing, and performance aspects of a "cellular" concrete pipe, a precast concrete pipe in which multiple continuous conduits were incorporated within its wall. Two fully-instrumented prototype segments of the proposed cellular concrete pipe were manufactured using standard dry-cast manufacturing procedures. The pipe segments were subjected to a D-load test to evaluate their structural performance. The observed structural performance was found to be comparable to solid-wall specimens, particularly when a four-conduit configuration was used. Of the six materials used as conduits, PVC and aluminum were found to perform the best. The presence of the conduits appears to delay the on-set of major cracks, thus increasing the D-load value. Key words: precast, concrete, pipe, experimental, conduit system, trenchless construction methods.

A method of measuring water contents for cellular concrete and fly ash in an IR dryer

1993 ◽  
Vol 36 (10) ◽  
pp. 1164-1166
Author(s):  
V. P. Ivanov ◽  
S. V. Medvedevskikh ◽  
S. Yu. Koltashev
Keyword(s):  
Fly Ash ◽  
Water Contents ◽  
Cellular Concrete

scholarly journals The potential use of lightweight cellular concrete in pavement application: a review

2020 ◽  
Vol 13 (6) ◽  
pp. 686-696
Author(s):  
Frank Mi-Way Ni ◽  
Abimbola Grace Oyeyi ◽  
Susan Tighe
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ease Of Use ◽  
Potential Candidate ◽  
Actual Performance ◽  
Freeze Thaw ◽  
Lower Weight ◽  
And Performance ◽  
Potential Use ◽  
Cellular Concrete

AbstractProtecting the pavement subgrade to increase the service life of road pavements is an aspect currently being explored. Several alternative pavement subbase materials are being considered, including Lightweight Cellular Concrete (LCC). Due to its lower weight, LCC incorporating industrial by-product, making it sustainable, and ease of use amongst other benefits, is seen as a potential candidate. This paper reports reviewing the potential application of LCC within the pavement structure with a specific application as a subbase. It examines the various properties such as modulus of elasticity, compressive and tensile strength, Water absorption, and freeze-thaw resistance necessary for pavement application. It also assesses its use in the field in Canada considering the design methods utilized. Some limitations and gaps for LCC application in pavements are also established and recommendations on how to further its use and performance. This review concludes that LCC possesses potential as a pavement subbase alternative; however, other mechanical properties like LCC’s fatigue life is essential. A comparative field study is also recommended to monitor actual performance and various factors on performance.

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