scholarly journals Strength characteristics of foam concrete samples with various additives

2018 ◽  
Vol 245 ◽  
pp. 03015 ◽  
Author(s):  
Vladimir Rybakov ◽  
Anatoly Seliverstov ◽  
Denis Petrov ◽  
Andrei Smirnov ◽  
Anna Volkova
Keyword(s):  
Moisture Content ◽  
Limit Load ◽  
The Other ◽  
Strength Characteristics ◽  
Correction Coefficient ◽  
Building Structures ◽  
Construction Site ◽  
Foam Concrete ◽  
Moisture Index ◽  
Ultimate Limit

The article presents the results of researched moisture indicators and strength characteristics of foam concrete with the various additives using. Foam concrete is produced both in a factory and on a construction site, has a density of 200 kg/m3 and is used in the innovative building structures type lightweight steel concrete structures (LSCS). Diatomite, microsilica, granite, perlite and vermiculite were used in sample production. As a part of the research, tests were carried out under the P-20 pressure to determine the ultimate limit load that the samples withstood. Then they were placed in a drying oven to determine the moisture mass removed from the samples during drying to a completely dry state, after which the moisture content values were set. The dependence between the moisture index and the strength characteristics of foam concrete is shown. It is established that samples of foam concrete with the perlite addition are the most durable. In addition, it is shown that the foam concrete with the vermiculite addition has the lowest moisture. It was determined that only for samples with the vermiculite addition, the correction coefficient depending on the moisture index differs in its value from the coefficients for the other samples, and, therefore, it had the greatest influence on the strength characteristics value of this series.

scholarly journals Light concrete based on foam polyamidbe-tonic composition

2019 ◽  
Vol 7 (1) ◽  
pp. 70-75
Author(s):  
Левон Маилян ◽  
Levon Mailyan ◽  
Татьяна Голова ◽  
Tat'yana Golova
Keyword(s):  
Reinforced Concrete ◽  
Energy Efficient ◽  
Concrete Strength ◽  
Experimental Studies ◽  
Fiber Reinforced Concrete ◽  
Strength Characteristics ◽  
Building Structures ◽  
Optimal Composition ◽  
Foam Concrete ◽  
Layer Structures

One of the most important tasks of construction is the use of energy-efficient sin-gle-layer structures based on foam concrete and an increase in their bearing ca-pacity due to the use of fiber reinforcement, which will significantly improve the performance properties of fiber-reinforced concrete. Strength characteristics of fibro-foam concrete reinforced with polyamide granules with various types of filler and recommendations for its use in building structures were obtained. These experimental studies allow us to recommend the optimal composition of polyam-ide concrete compositions.

scholarly journals Beam-Column Timber Joint Connection Behavior Due to Nail and Modified-Washer Reinforcement Tests

2020 ◽  
Vol 10 (1) ◽  
pp. 6-10
Author(s):  
Yosafat Aji Pranata ◽  
Anang Kristianto ◽  
Olga Pattipawaej
Keyword(s):  
Limit Load ◽  
Building Structures ◽  
Proportional Limit ◽  
Standard Type ◽  
Timber Joint ◽  
Joint Connection ◽  
Column Joint ◽  
Strength And Stiffness ◽  
Partial Connection ◽  
Ultimate Limit

Timber connection capacity, in case of beam-column joint connection provides significant impact on the wooden building structures. Strength and stiffness of timber connections using reinforcement technique of wooden building structures have not been studied intensively. This paper studies the use of nails and modified-washer to improve wood connection’s performance. The experimental tests were conducted in the laboratory by comparing the partial connection between test specimen timber without reinforcement (standard type) and the reinforcement (PRP type). The testing was conducted based on partial connection beam-column joint test using Universal Testing Machine’s with a modified holder. Wood studied includes Meranti (Shorea spp.) and Mersawa (Anisoptera spp.). PRP type connection was using nails and modified-washer strengthening, and standard type connection was using a classic washer. Parameters studied were strength and stiffness of the connection, reviewed both: proportional limit load and ultimate limit load conditions. Result obtained from this research indicates that the use of nails and modified-washer make a positive contribution to improving the performance of the beam- column timber joint connections, in terms of strength capacity (both of proportional limit and ultimate limit loads) and stiffness capacity (displacement ductility ratio). Meranti beam-column timber joint is more brittle than Mersawa beam column timber joint, it has an impact on the results. PRP-type of Mersawa timber connection produces a higher ductility than the standard type, while the PRP-type of Meranti timber connection produces a similar ductility to the standard type.

Pull-Out Performance of T-Stub End Plate Connected To Concrete Filled Thin-Walled Steel Tube (CFTST) using Lindapter Hollo-Bolts

2018 ◽  
Vol 15 (1) ◽  
pp. 59
Author(s):  
NAZRUL AZMI AHMAD ZAMRI ◽  
CLOTILDA PETRUS ◽  
AZMI IBRAHIM ◽  
HANIZAH AB HAMID
Keyword(s):  
Limit Load ◽  
Steel Tube ◽  
Limit States ◽  
End Plate ◽  
Pull Out ◽  
Pullout Load ◽  
Thin Walled ◽  
Stub End ◽  
Concrete Filled Steel Tubes ◽  
Ultimate Limit

The application of concrete filled steel tubes (CFSTs) as composite members has widely been used around the world and is becoming popular day by day for structural application especially in earthquake regions. This paper indicates that an experimental study was conducted to comprehend the behaviour of T-stub end plates connected to concrete filled thin-walled steel tube (CFTST) with different types of bolts and are subjected to pullout load. The bolts used are normal type bolt M20 grade 8.8 and Lindapter Hollo-bolt HB16 and HB20. A series of 10 mm thick T-stub end plates were fastened to 2 mm CFTST of 200 mm x 200 mm in cross-section. All of the specimens were subjected to monotonic pull-out load until failure. Based on test results, the Lidapter Hollo-bolts showed better performance compare to normal bolts. The highest ultimate limit load for T-stub end plate fasten with Lindapter Hollo-bolt is four times higher than with normal bolt although all end plates show similar behaviour and failure mode patterns. It can be concluded that T-stub end plate with Lindapter Hollo-bolt shows a better performance in the service limit and ultimate limit states according to the regulations in the design codes.

The Effect of Sand/Cement Ratio and Cement Grade on the Compressive Strength of Foam Concrete

2013 ◽  
Vol 405-408 ◽  
pp. 2933-2937
Author(s):  
Ji Chuan Geng ◽  
Kun Ni ◽  
Shan Qi Fang ◽  
Yun Xing Shi ◽  
Yi Ning Ding ◽  
...  
Keyword(s):  
Compressive Strength ◽  
The Other ◽  
Foam Concrete ◽  
Cement Ratio ◽  
Series Of Experiments

A series of experiments have been undertaken to investigate the effects, on compressive strength, of variable sand/cement ratios and cement grade. Ten mixtures of different s/c ratios used two kinds of cement were cast and the compressive strength at different curing ages was tested. The results indicate that the compressive strength gets lower as the s/c ratio increases for both 42.5R and 32.5R cement. For the mixtures used 32.5R cement, the 28-day compressive strength is pretty low for the s/c ratios of 1.5 and 2. The specimens used 42.5R cement have higher compressive strength than those with 32.5R cement. The compressive strength decreases from 42.5R to 32.5R cement are significantly smaller for the s/c ratios of 0.5 and 1 than the other three s/c ratios.

scholarly journals Strength Characteristics of Preformed Foam Concrete

2019 ◽  
Vol 8 (4) ◽  
pp. 8213-8216 ◽  
Keyword(s):  
Experimental Investigation ◽  
Coarse Aggregate ◽  
Strength Test ◽  
Strength Characteristics ◽  
Strength Parameter ◽  
Light Weight ◽  
Foam Concrete ◽  
Strength Parameters ◽  
Light Weight Concrete ◽  
Parameter Test

The study deals with the usage of perforated foam of various percentages to that of coarse aggregate to produce light weight concrete. With the day to day increase in industries and civilization’s expansion it has become very much necessary to produce structures with proficiently lesser weight. Its usage has become more proficient in construction of building in earthquake prone areas. This experimental investigation deals with the study of strength parameters of light weight concrete by performing various strength test and its various behavior s such as compression, tensile and flexure are studied by adding preformed foam at various proportions of 0%, 2%, 5%, 10%, 20% and 40%. All these strength parameter test are performed on 7th day, 14th day and 28th day respectively from day of casting

scholarly journals Determination of Nutritional Composition of Ackee’s Apple Blighia sapida and Monkey Kola Cola millenii

2020 ◽  
pp. 127-136
Author(s):  
Oyetade Joshua Akinropo ◽  
Bello Lukman Abidemi ◽  
Adesiyan Blessing Adedayo
Keyword(s):  
Vitamin C ◽  
Moisture Content ◽  
Crude Protein ◽  
Proximate Analysis ◽  
Nutritional Composition ◽  
The Other ◽  
Mineral Analysis ◽  
Crude Fibre ◽  
Fruit Samples

The proximate analysis of the fruit sample that homogenously sampled from the wild was taken and quartered to get appreciable weight fit for analysis. Due to it perishable nature the quartered sample for each of the fruit was stored in an air tight container and kept in the refrigerator at a temperature of about 4°C. For the determination of the nutritional composition, parameters which include their proximate, minerals, and vitamin C were quantitatively determined while the anti-nutrient composition were qualitatively and quantitatively analyzed. Compared to ackee’s apple, monkey cola was found to consist of 64.41% moisture content, 1.69% ash, 10.21% crude fibre, 1.25% crude fat, 4.44% crude fibre, 18.06% carbohydrates while ackee’s apple consist of 73.21% moisture, 1.49% ash, 9.38 % crude protein, 13.98% crude fat, 2.08% crude fibre, 0.86% carbohydrates and 4.45% of vitamin C. The mineral analysis for both samples was quantitatively determined using Atomic Absorption spectrophotometer (AAS). The minerals determined for ackee’s apple and monkey cola were magnesium which was 1391.65 ppm, calcium 628.23 ppm, sodium 506.96 ppm, potassium 3976.14 ppm, iron 1.0 ppm, copper 5.00, zinc 4.00, cobalt 3.0 and phosphorus 2616.90 ppm the iron however, was not detected. Ackee’s apple on the other hand, consist of magnesium 498.01 ppm, calcium 478.56 ppm, sodium 398.80 ppm, potassium 4970.18 ppm, copper 2.00, zinc 5.00, cobalt 3.0 and phosphorus 373.84 ppm. The qualitative screening of the anti-nutrients revealed the absence of phenol from both fruit samples while tannins were present only in the monkey cola. The flavonoids, phytic acid and oxalate were quantitatively determined to be 1240 mg, 625 mg and 155 mg for Monkey kola and 640 mg, 340 mg and 65 mg for Ackee’s apple.

scholarly journals Relativiser Alternation and Relative Clause Complexity: Insights from Nigerian and American Varieties

2020 ◽  
pp. 91-113
Author(s):  
Mayowa Akinlotan
Keyword(s):  
Relative Clause ◽  
Relative Clauses ◽  
The Other ◽  
Construction Site ◽  
Simple Construction ◽  
Syntactic Form ◽  
Complex Versus ◽  
New Varieties ◽  
Syntactic Function ◽  
Independent Effects

Idiosyncrasies and peculiarities distinguishing new Englishes from the established ones are often identified and measured by examining the extent to which structural choices and patterns vary across the board. The competition between relativisers wh- and that in the construction of relative clause, which itself is a structurally complex-versus-simple construction site, allows for showing the extent to which choice of a relativiser relates to the construction of a complex or simple relative clause, given different factors. On the other hand, such investigation can also shed some light on the extent to which structural com- plexity characterises new varieties of English. Relying on 628 relative clauses drawn from written academic corpus, the study shows that WH-relativiser is preferred to THAT-relativiser by the Nigerian speakers, and vice versa by the American speakers. It is also found that WH-relative clause is more likely to be complex-structured while THAT-relative clause is more likely to be simple-structured. Among eight factors tested for independent effects, the factors representing relativiser posterior syntactic form, syntactic function, and syntactic positioning of the relative clause appeared to be strong predictors of where we might (not) find a certain relativiser and whether a complex or simple relative clause will emerge.

scholarly journals Safety of building constructed on hillside slope

2021 ◽  
Vol 23 (1) ◽  
pp. 126-139
Author(s):  
S. V. Yushchube ◽  
I. I. Podshivalov ◽  
A. S. Larionov
Keyword(s):  
Pile Foundation ◽  
Strain State ◽  
Three Dimensional ◽  
Soil Formation ◽  
The Other ◽  
Structural Safety ◽  
Construction Site ◽  
Geological Surveys ◽  
Geological Conditions ◽  
Supporting Structures

The paper focuses on the pile foundation and footing of the building constructed on a hillside slope and consisting of four three-dimensional blocks. The building is arranged such that to protect the first block constructed on the footslope from the negative technogenic influence of the latter via the embedment of three supporting blocks into the hillside slope. The first three-dimensional block is a three-storey brick building, while the other three are the spatial supporting structures made of insitu reinforced concrete. All the blocks locate at different position levels. The resulting embedded part of the structure matches the class KS-3 construction site safety. It is thus necessary to assess the structural safety of the building constructed in difficult engineering and geological conditions. The MicroFe software is used for finite element dimensional calculations of the pile foundation and footing strength, stability and oscillation after studying the engineering-geological surveys, the analysis of the soil formation, composition and physicalmechanical properties, the piling field. Also, the theoretical model is proposed for the footingfoundation–building system. The obtained results allow assessing the stress-strain state of the pile foundation and footing with the lateral support to the hillside slope of soil.

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