scholarly journals USE OF SHELL-CONTAINING SOIL IN TRANSPORT CONSTRUCTION

2020 ◽  
pp. 8-15
Author(s):  
M. Vysotskaya ◽  
M. Lashin ◽  
A. Kurlykina
Keyword(s):  
Mechanical Properties ◽  
Mechanical Load ◽  
Physical And Mechanical Properties ◽  
Road Construction ◽  
The Body ◽  
Filtration Coefficient ◽  
Construction Sites ◽  
Maximum Increase ◽  
Input Control ◽  
Partial Remainder

The article deals with the problem of using soils represented by sand with a significant content of shell in the construction of embankments of railways and highways. The review of literature sources on this topic did not yield any results, which aroused interest in the possibility of using this soil. Research has been carried out to determine the main physical and mechanical properties of shell sand. Data showing the dynamics of changes in the physical and mechanical properties of the soil during compaction are obtained. The dependence of the reduction of partial residues from 10 to 0.1 sieves is revealed. The maximum increase in the partial remainder occurs on the screen 0,1. Obviously, these changes are the result of grinding the soil under the influence of a large mechanical load and are one of the factors reducing filtration in this soil. It is found that the value of the filtration coefficient at the input control is 2.58 m/day., after compaction of the same soil in the body of the embankment, the filtration coefficient fell to-1.51 m/day. Thus, there is a decrease in the filtration coefficient after compaction of the soil by 41.5% in comparison with the input tests of the soil. The need for further research to find technological solutions for the use of such soil on road construction sites is justified.

Frost Heaving Soil Road Use Synthetic Adhesive Reinforcement Method

2013 ◽  
Vol 740 ◽  
pp. 759-762
Author(s):  
Hao Zeng Bao
Keyword(s):  
Mechanical Properties ◽  
Industrial Waste ◽  
Construction Materials ◽  
Reference Value ◽  
Physical And Mechanical Properties ◽  
Road Construction ◽  
Experimental Methods ◽  
Frost Heaving ◽  
The World ◽  
Rock And Soil

In many areas, there are still a development road construction materials, traditionally, often use reinforced concrete, asphalt and other adhesive method to strengthen the low strength of rock and soil anti-freeze expansion coefficient; And now all countries in the world are studying how to use industrial production waste development of new composite materials. One of the most development potential, the production of industrial waste - slime. This paper USES the Russian kazan national construction university experimental methods, in the experiment to improve frost heaving soil physical and mechanical properties of the method for the synthesis of adhesive, based on the feasibility and applicability, environmental assessment of research and analysis, for the use of adhesive put forward a lot of reference value.

scholarly journals An African violin – The feasibility of using indigenous wood from southern Africa as tonewood

2021 ◽  
Vol 117 (11/12) ◽  
Author(s):  
Martina Meincken ◽  
Gerhard Roux ◽  
Thomas Niesler
Keyword(s):  
Mechanical Properties ◽  
Southern Africa ◽  
Wood Species ◽  
Physical And Mechanical Properties ◽  
Relative Magnitude ◽  
The Body ◽  
String Instruments ◽  
Classification Schemes ◽  
Wind Instrument ◽  
Audio Recordings

The wood used to make musical instruments needs to have particular properties. Depending on its function, such as a soundboard for string instruments or the body of a wind instrument, different properties are desirable to obtain the best musical quality. Several different classification schemes exist that correlate physical and mechanical properties of wood to define desirable ranges for tonewoods, and to allow suitable wood species to be chosen. The physical and mechanical properties of various wood species indigenous to southern Africa were characterised and then assessed in terms of their suitability for violin construction using these classification schemes. The results of this analysis show that the most suitable of the wood species assessed are yellowwood and sapele. These were subsequently used by a professional luthier to build an ‘African’ violin. The sound quality of this instrument was determined subjectively through performances to an audience and more objectively via spectral analysis of audio recordings. This analysis shows clear differences in the relative magnitude of the harmonics between the violin made from indigenous wood and an instrument made with conventional wood species. Despite the differences, yellowwood and sapele were found to be suitable tonewoods, resulting in an instrument with a unique sound.

Application of New Soil Consolidator in Road-Construction Engineering

2012 ◽  
Vol 238 ◽  
pp. 466-469
Author(s):  
Hong Zhang ◽  
Dong Liang Xun ◽  
Zhao Yang ◽  
Fu Quan Ji
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Physical And Mechanical Properties ◽  
Road Construction ◽  
Point Of View ◽  
Curing Time ◽  
Construction Engineering ◽  
Geological Conditions ◽  
Silt Layer

This paper contrastively analyses the consolidation instances of silt with HEC and HAS soil consolidators, also emphatically discusses the influence regularities of the compressive strength of solidified soil with the following factors: the dose of consolidators and the curing time. Meanwhile, from the point of view of experiment, this paper studies the physical and mechanical properties of solidified soil. Case study shows that HEC and HAS soil consolidators behave as well as cement and lime in road-construction engineering, and even that filling subgrade independently. Also, this paper proposes the appropriate value 6% of HEC and HAS soil consolidators for solidifying silt layer, which can be used as reference for the similar geological conditions.

Incorporation of Coating Plaster Residues in the Formulation of Red Ceramic Mass

2010 ◽  
Vol 636-637 ◽  
pp. 1397-1403 ◽  
Author(s):  
J.B. Silva ◽  
Priscylla Cinthya A. Gondim ◽  
R.M. Nascimento ◽  
U.U. Gomes ◽  
W. Acchar
Keyword(s):  
Mechanical Properties ◽  
Water Absorption ◽  
Construction Industry ◽  
Ceramic Industry ◽  
Physical And Mechanical Properties ◽  
Bending Stress ◽  
Construction Sites ◽  
Domestic Waste ◽  
Plastic Clays ◽  
Eds Microanalysis

Coating plaster residues (CPR) used in the civil construction industry account for a considerable percentage of building debris. The debris generated at construction sites represents 40% of domestic waste in Brazilian municipalities, causing serious environmental problems, given that a large portion of the residue is discarded in inappropriate places. The incorporation of CPR into the mass formulations of red ceramic may be economically and environmentally beneficial. In the present study 5%, 10% and 15% of CPR was added to formulation D, with a 1:1 composition by weight of different medium plastic clays, a composite that showed the best physical and mechanical properties in a study conducted with three formulations of a ceramic industry containing compositions of 1:1, 1:2 and 2:1. The test specimens were compressed uniaxially, oven-dried (110 °C) and sintered at 850 °C, 950 °C and 1050 °C, with constant temperature for two hours. Lineal shrinkage, water absorption, apparent density, bending stress failure and section of fracture micrographs of the sample, with EDS microanalysis, were analyzed.

scholarly journals THE PROSPECTS MANUFACTURE OF RECYCLED HOT MIX ASPHALT WITH FIBER PLASTIC REINFORCEMENT

2017 ◽  
Vol 1 (48) ◽  
pp. 258-264
Author(s):  
V. V. Ilchenko ◽  
V. V. Tymoshevskyi ◽  
R. A. Mishchenko ◽  
D. S. Lyashko ◽  
V. V. Riznyk
Keyword(s):  
Mechanical Properties ◽  
Industrial Waste ◽  
Hot Mix Asphalt ◽  
Experimental Studies ◽  
Physical And Mechanical Properties ◽  
Road Construction ◽  
Preparation Technology ◽  
Fiber Plastic ◽  
Fiber Addition

The most common ways of milled asphalt re-use, what is formed during road topping repair is considered. The results of experimental studies of preparation technology features and physical and mechanical properties of recycled hot mix asphalt determination based on milled asphalt with plastic fiber addition that obtained from industrial waste is presented. Defined regulations correspondence obtained recycled hot mix asphalt and ways of their use in road construction is determined.

Influence of Structural Parameters of Nonwoven Geotextiles on Separation and Filtration in Road Construction

2020 ◽  
Vol 20 (4) ◽  
pp. 449-460
Author(s):  
Špela Bezgovšek ◽  
Dunja Šajn Gorjanc ◽  
Boštjan Pulko ◽  
Stanislav Lenart
Keyword(s):  
Mechanical Properties ◽  
Structural Properties ◽  
Structural Parameters ◽  
Physical And Mechanical Properties ◽  
Road Construction ◽  
Knitted Fabrics ◽  
Compression Creep ◽  
Filtration Properties ◽  
Mechanical Bonding ◽  
Bonding Technique

AbstractNonwoven geotextiles are often used in road construction as a separation layer. They consist of the web of fibers with different orientations. The orientation of fibers has an important influence on physical and mechanical properties of nonwoven geotextiles. The production of nonwoven geotextiles is cheaper in comparison to woven or knitted fabrics which can also be used as separation geotextiles. The purpose of this research was to study the influence of structural properties of nonwoven geotextiles, namely the diameter of fibers and mass and thickness of nonwoven geotextiles, on their mechanical and hydraulic properties. Six types of nonwoven geotextiles were used in the research. They were produced by the drylaid process (carded) using mechanical bonding technique and also with the combination of mechanical and thermal bonding technique. The research confirmed that the bonding technique and structural properties significantly influence the separation and filtration properties of nonwoven geotextiles, such as opening size and water permeability. It was also found that there are no significant differences in mechanical properties, such as viscoelastic properties and compression creep, between the samples in the dry and wet conditions.

scholarly journals Effect of Dehydrothermal Treatment on the Mechanical Properties and Biocompatibility of Plaster of Paris–CaCO3 Hydrogel Loaded With Cinnamaldehyde for Biomedical Purposes

2021 ◽  
Vol 16 (1) ◽  
pp. 1934578X2098460
Author(s):  
Anne Handrini Dewi ◽  
Dedy Kusuma Yulianto ◽  
Widowati Siswomihardjo ◽  
Rochmadi Rochmadi ◽  
Ika Dewi Ana
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Inflammatory Cells ◽  
The Body ◽  
Chemical Agent ◽  
3 Dimensional ◽  
Plaster Of Paris ◽  
Inflammatory Agent ◽  
Anti Inflammatory

CaCO3 hydrogel incorporation into Plaster of Paris (POP) formulations decreased the resorption rate of the POP after implantation in the body. Although an inflammatory process is required as part of wound healing, the accumulation and activation of inflammatory cells in the POP–hydrogel CaCO3 implant area needs to be controlled. Therefore, cinnamaldehyde, as an anti-inflammatory agent with a unique α, β-unsaturated aldehyde, was incorporated into the CaCO3 hydrogel. During the incorporation, both the lipophilic and hydrophilic sides of the cinnamaldehyde molecule can influence the physical and mechanical properties of the CaCO3 hydrogel, in which mechanical properties of a tissue engineering scaffold are important to fine tune cellular activity during implantation. On the other hand, as a 3-dimensional polymeric structure, crosslinking is needed for the CaCO3 hydrogel to stabilize and increase its molecular weight for better mechanical strength, and more resistance to heat, wear, and solvent attack. For that purpose, dehydrothermal treatment (DHT) was applied to the crosslink hydrogel system as a favorable crosslinking method to avoid the use of a chemical agent. In this study, 3 groups of hydrogels of CaCO3, namely DHT crosslinked, loaded with cinnamaldehyde, and loaded with cinnamaldehyde followed by DHT crosslinking were developed before being combined with POP in 50 wt%. To evaluate the effect of DHT to the final POP-cinnamaldehyde-loaded CaCO3 hydrogel properties and biocompatibility, scanning electron microscopy, contact angle, surface roughness, hardness, diametral tensile strength, and in vivo biocompatibility studies were conducted. It was observed that cinnamaldehyde with DHT treatment improved the POP–hydrogel CaCO3 properties and had good biocompatibility. Thus, POP-cinnamaldehyde-loaded CaCO3 hydrogel can be a promising bone substitute containing an anti-inflammatory agent.

Physical and mechanical properties recycled hot mix asphalt based on milled asphalt with the plastic fiber addition

2021 ◽  
Vol 2021 (23) ◽  
pp. 76-85
Author(s):  
Oksana Demchenko ◽  
◽  
Roman Mishchenko ◽  
Volodymyr Ilchenko ◽  
◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hot Mix Asphalt ◽  
Asphalt Pavement ◽  
Physical And Mechanical Properties ◽  
Road Construction ◽  
Household Waste ◽  
Gradual Improvement ◽  
The Road ◽  
The Cost ◽  
Fiber Addition

Introduction. The current state of the network of public roads due to the negative impact of climatic factors and ever-increasing traffic loads characterized by significant amounts of deformation and destruction of the road structure so requires significant material costs for maintenance and gradual improvement of a transport and operational condition according to the operating regulatory requirements.Problem Statement. One of the promising areas to reduce the cost of road construction is manufacturing the recycled hot mix asphalt based on milled asphalt, which is usually formed in scarifying of the road surface layers during repair and construction works, with the plastic fiber addition obtained from household plastic waste. This combination of secondary materials will not only get the economic effect of reducing the cost of purchasing new road construction materials but also improve the environmental situation through the use of household waste.Purpose. Investigation of physical and mechanical properties of recycled hot mix asphalt based on milled asphalt with the plastic fiber addition Materials and Methods. It was established the manufacturing possibility of recycled hot mix asphalt based on milled asphalt with the plastic fiber addition. Test specimens performance measuring was conducted to determine the average density of the material, water saturation, swelling at ultimate compressive strength in the laboratory conditions according to standardized techniques by current regulations.Results. The results of experimental studies regarding the manufacturing features and physical and mechanical properties of recycled hot mix asphalt based on milled asphalt with the addition of plastic fiber obtained from household waste are shown.Conclusion. The correspondence of the manufactured specimens of recycled hot mix asphalt to regulations is established as well as its road construction application options.Keywords: asphalt pavement, recycled hot mix asphalt, hot recycled, milled asphalt, plastic fiber, (RHMA), reclaimed asphalt pavement (RAP).

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