Strength Material
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Author(s):  
Minakshi Uchibagle ◽  
B Ram Rathan Lal

Controlled low-strength material (CLSM) is a self-levelling cementitious material. It is not concrete nor soil-cement, however, it possesses properties similar to both. CLSM is widely used as a replacement for soil-cement material in many geotechnical applications such as structural backfill, pipeline beddings, void fill, pavement bases and bridge approaches. This paper study potential possibility of polypropylene fiber in CLSM. Harden and fresh properties compressive strength , flowability and density for the proposed CLSM were investigated. This CLSM mix design with different percentage of polypropylene fiber and pond ash, cement and water. EPS beats and polypropylene add 0 %, 0.5%, 1.0% and 1.5% of total weight is added in CLSM MIx. Results show that the CLSM incorporating EPS beats and polypropylene satisfies compressive strength requirement as per the requirements of ACI committee 229. polypropylene decreases the flowability of CLSM mix and at the same tine by adding EPS beats the density of CLSM mix are reduce which become lightweight CLSM mix. from this it can conclude that polypropylene fibers is less effective in CLSM mix and EPS beats make CLSM mix lightweight which create lightweight CLSM mix applicable for filling application.


Author(s):  
E. A. Alifirenko ◽  
N. N. Barakhtina ◽  
E. V. Malov

A new high-strength material has been developed – large-scale thin-walled welded panels made of aluminum-magnesium alloy 1565ch. Its use, combined with modern achievements in the field of strength and aerohydrodynamics, made it possible to create a multifunctional economy skeg-type hovercraft “Haska 10” with unique operational capabilities.


2021 ◽  
Vol 18 (3) ◽  
pp. 244-250
Author(s):  
J.A. Oke

Deltaic lateritic soil obtained from Emohua in Rivers State, Nigeria was studied to ascertain its suitability as a substitute to sand in concrete for producing controlled low-strength material (CLSM). Cement, coarse aggregate, as well as lateritic soil which replaced sand was combined in ratio 1:5:11 to produce lateritic concrete using varying water-cement (w/c) ratios at varying curing durations. Variation in the w/c ratios ranging from 0.2 to 0.5 at 0.1 intervals and the curing periods which varied between 7, 14 and 28 days were examined. As with the case with conventional concrete, strength development, as well as cement hydration took place after casting over the curing periods. Recent applications using CLSM recommends that a compressive strength of 8.3 N/mm2 or less is required for materials used as conventional compacted backfill soil or structural fillings. In a situation where future excavation is envisioned, it is recommended that the maximum long-term compressive strength of CLSM should generally have an upper limit of 2.1 N/mm2 for compacted backfill material hence, the lateritic concrete produced in this study using the 1:5:11 mix design at 0.2 w/c ratio, cured for 28 days which gave strength of 5.3 N/mm2 can be used as CLSM which primarily, can be utilized as a substitute for compacted backfill to sub-base and/or subgrade of flexible pavements. Where necessary, super plasticizer can be introduced to increase flowability of the lateritic concrete.


Author(s):  
A. A. Kazubov ◽  
D. A. Mironov

Agriculture is the most important branch of the national economy, providing the population of our country with food and obtaining raw materials for a number of industries. The role of agriculture in the economy of Russia and its regions shows the structure and level of development of the state. It is impossible to get a good harvest without proper cultivation of the land. Cultivation of any crops begins with basic tillage, which is one of the most time-consuming operations. For this purpose, mounted and semi-mounted ploughshares are used. One of the effective ways to reduce the energy intensity of the main tillage process is chisel-shaped ploughshares with a protruding toe (chisel), which is located below the blade by 20 … 25 mm. Due to this, the sinking capacity of the hull and its resource are improved. To achieve this goal, such methods are used as the influx of metal in the field-cut zone, which increases its thickness, the surfacing of the nose part, which increases wear resistance and, accordingly, reduces wear of the sock in thickness, welding to the sock with a plate made of a more high-strength material [1].


2021 ◽  
Vol 2045 (1) ◽  
pp. 012027
Author(s):  
X H Kong ◽  
S Cui ◽  
L H Chen ◽  
X H Wang

Abstract To improve the resource utilization of solid waste, excavation abandoned soil and red mud, a by-product of alumina industry, were introduced into the preparation of controlled low strength material (CLSM). By carrying out the flowability test, bleeding test and compressive strength test, the relationship between properties of CLSM mixture and the amount of red mud was analysed. The experiment results indicate that the flowability and bleeding rate of the mixture decrease with the increase of red mud content. When the red mud content is less than 20%, the mixture shows good flowability. The addition of red mud can accelerate the completion time of bleeding and play a positive role in the bleeding stability of the mixture. When the red mud content is 10%, the strength of the mixture reaches the maximum, while the strength of the mixture with other contents decreases with the increase of red mud content. For the CLSM made of excavated soil, red mud has a good application prospect in terms of bleeding stability and strength.


2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Sobar Ihsan ◽  
Adliansyah , ◽  
Ahmadil Amin ◽  
Marlina Ayu Lestari

Dalam memproduksi energi lisrik, PLTA Ir P.M Noor melakukan pemeliharaan periodik yaitu 8.000 jam kerja (Annual Inspection), 20.000 jam kerja (General Inspection) dan 40.000 jam kerja (Major Inspection). Dalam Pelaksanaan Pemeliharaan Periodik Major Inspection, PLTA Ir P.M Noor diharuskan melakukan pekerjaan sesuai dengan jadwal dan target yang telah ditetapkan oleh Unit Pelaksana Pengendalian Pembangkit Barito. Dalam pelaksanaan Major Inspection dilakukan pelepasan seluruh komponen pada turbin, termasuk pada guide vane. Untuk melepaskan guide vane diperlukan pelepasan komponen-komponen yang mendukungnya antara lain pin guide vane, arm, dan bushing. Pelaksanaan pelepasan pin guide vane yang berupa baja besi cukup susah untuk dilepaskan dikarenakan bentuk pin guide vane yang sedemikian rupa yaitu vertikal dengan guide vane sehingga menyebabkan permasalahan timbul ketika melepaskannya dari rangkaian pendukung guide vane. Permasalahan lain yang muncul yaitu saat jumlah pin guide vane yang berjumlah 20 buah (jumlah guide vane 20 buah), sehingga membutuhkan waktu yang cukup lama (±2 hari), waktu yang lama ini akan mempengaruhi pekerjaan pelepasan komponen lainnya, sehingga akan menyebabkan resiko keterlambatan dalam penyelesaian pelaksanaan Major Inspection. Pada penelitian hasil perhitungan batas minimum von mises 0.00000478 MPa dan maksimum 245.413 MPa dan nilai von mises stress masih dibawah dari nilai yield strength material yaitu 245.413 MPa. Sedangkan manfaat secara finansial dapat mempercepat pelaksanaan Major Inspection yang dalam pelaksanaan pekerjaan melepas pin guide vane memerlukan waktu ±2 hari, dapat dilakukan dalam ± 3 jam saja.


2021 ◽  
Vol 297 ◽  
pp. 123769
Author(s):  
Saofee Dueramae ◽  
Sasipim Sanboonsiri ◽  
Tanvarat Suntadyon ◽  
Bhassakorn Aoudta ◽  
Weerachart Tangchirapat ◽  
...  

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