Kekuatan Awal, Workability dan Berat Volume Beton berbahan Agregat Plastik Polypropylene

Kilat ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 301-308
Author(s):  
Muhammad Sofyan
Keyword(s):  
Slump Test

Eksploitasi plastik menyebabkan penumpukan limbah plastik semakin meningkat. Penggunaan limbah plastik pada beton dapat berkontribusi pada pengurangan limbah plastik di dunia. Dalam penelitian plastik polypropylene dimanfaatkan sebagai subtitusi parsial agregat halus. Penelitian ini bertujuan untuk menganalisa beberapa property fisis dan mekanis beton yang menggunakan limbah palstik sebagai subtitusi agregat halus. kuat tekan , workability dan berat volume menjadi variable utama yang akan diukur. Hasil dari penelitian ini menunjukkan bahwa pemakaian Plastik polypropylene sebagai pengganti agregat halus 10%, 20%, 30%, dan 40%, menghasilkan slump test sebesar 8,1 cm, 8,4 cm, 8,6 cm, dan 8,8 cm, dianggap masih memenuhi standar nasional indonesia. Hasil dari berat volume beton didapatkan sebesar 2211.46 kg/m3, 2138.21 kg/m3, 2105.73 kg/m3, dan 2021.65 kg/m3. Hasil Untuk kuat tekan pada 7 Hari didapatkan sebesar 9.12 MPa, 8.704 MPa, 8.5 MPa, dan 7.85 MPa.  

Einfluss der passiven Nackenflexion während neurodynamischer Testungen auf die muskuläre Rekrutierung der unteren Extremität

2020 ◽  
Vol 24 (04) ◽  
pp. 193-199
Author(s):  
Kevin Maliszewski ◽  
David Snowdon ◽  
Harry von Piekartz ◽  
Dirk Möller
Keyword(s):  
Slump Test ◽  
Straight Leg Raise

ZusammenfassungEine Nackenflexion beeinflusst nachweislich die Mechanosensibilität von neurodynamischen Testungen der unteren Extremität. In der Literatur wird diskutiert, ob sich dieses Phänomen durch eine erhöhte (intraneurale) Spannung des Nervengewebes und/oder einen protektiven Reflexmechanismus des motorischen Systems erklären lässt. Bislang konnte kein protektiver Mechanismus in Form einer modifizierten muskulären Rekrutierung als mechanosensibler Parameter zwischen der passiven Nackenflexion und der unteren Extremität gemessen werden.Alle in diese Querschnittsstudie eingeschlossenen 30 asymptomatischen, männlichen Probanden führten den neurodynamischen Straight-Leg-Raise-Test und Slump-Test durch. Um einen möglichen Einfluss der passiven Nackenflexion auf die muskuläre Rekrutierung der unteren Extremität festzustellen, wurden während dieser sensibilisierenden Bewegung die muskuläre Rekrutierung und das Bewegungsausmaß mittels Elektromyografie und Inertialsensorik (kinematische Messtechnik) gemessen.Die Studienergebnisse bestätigten einen segmentübergreifenden Einfluss der passiven Nackenflexion auf die muskuläre Rekrutierung der unteren Extremität. Deren Muster deuten möglicherweise auf einen protektiven muskulären Mechanismus in endgradigen neurodynamischen Positionen hin.

The Flowability and Adsorption of Low Sulfate Cement with Superplasticizers

2013 ◽  
Vol 477-478 ◽  
pp. 904-907
Author(s):  
Ming Zhe An ◽  
Song Han
Keyword(s):  
Charge Density ◽  
Cement Paste ◽  
Water Demand ◽  
Cement Slurry ◽  
Sulfate Content ◽  
Standard Dosage ◽  
Slump Test ◽  
Adsorbed Amount ◽  
Lower Charge

The compatibility of low sulfate cement with naphthalene (NS) and polycarboxylate (PCE) type superplasticizers was discussed. The flowability of slurry and the adsorption of superplasticizers (SP) were investigated by mini slump test and TOC. The results show that severe compatibility degeneration is caused by low sulfate content in cement slurry. The water demand of slurry, the standard dosage and adsorbed amount of SPs were dramatically raised. In the cement slurry with low sulfate content, polycarboxylate type superplasticizers presents better performance than naphthalene type. The PCE with lower charge density presents better robustness. It is recommended in the preparation of concrete to avoid the incompatibility problems caused by lack of sulfate in cement paste.

scholarly journals Influence of Humidity on Yield Stress Determination by Slump Test of Slip-Prone Clayey Soils and Their Relation with the Chemical Properties

2012 ◽  
Vol 02 (04) ◽  
pp. 102-105
Author(s):  
Arturo F. Méndez-Sánchez ◽  
Ana M. Paniagua-Mercado ◽  
Karen E. Nieto-Zepeda ◽  
Leonor Pérez-Trejo ◽  
Elvia Diaz Valdés ◽  
...  
Keyword(s):  
Yield Stress ◽  
Chemical Properties ◽  
Clayey Soils ◽  
Stress Determination ◽  
Slump Test

Testing Procedures on Materials to Formulate the Ink for 3D Printing

2020 ◽  
Vol 2674 (2) ◽  
pp. 21-32 ◽  
Author(s):  
Malo Charrier ◽  
Claudiane Ouellet-Plamondon
Keyword(s):  
3D Printing ◽  
Yield Stress ◽  
Three Dimensional ◽  
Testing Procedure ◽  
Full Potential ◽  
Cement Pastes ◽  
Slump Test ◽  
Testing Procedures ◽  
Transportation Sector ◽  
Printing Ink

Three-dimensional (3D) printing has been used in various fields to tackle applications difficult for conventional manufacturing. To realize the full potential of this technology in the transportation sector, it is imperative to identify suitable tests and mixtures for printing “inks” made of mortar. In this study, several conventional and non-conventional tests on mortars and cement pastes were conducted. This work highlights the correlation between the results of slump test and the deformation test that indicates the comportment of the mixture under a stack of printed layers. Moreover, a strong connection between yield stress and mini-slump is observed, demonstrating a simplification of the testing procedure, and a link between the mortar and the cement paste is developed. In the printing ink design phase, this association enables the prediction of flowability. The yield stress and the final radius of the mini-slump tests were very well correlated for the admixture tested. The use of the mini-slump test simplifies the testing procedure and allows for quicker formulations of admixtures in the printing ink.

scholarly journals Effect of basalt aggregates and plasticizer on the compressive strength of concrete

2015 ◽  
Vol 4 (4) ◽  
pp. 520 ◽  
Author(s):  
Mohammad Al-Rawashdeh ◽  
Ashraf Shaqadan
Keyword(s):  
Compressive Strength ◽  
Laboratory Investigation ◽  
Concrete Strength ◽  
Experimental Program ◽  
Sieve Analysis ◽  
Curing Time ◽  
Compressive Test ◽  
Slump Test ◽  
Compressive Strength Of Concrete

The purpose of this research is to investigate the feasibility of using basalt aggregates and plasticizers in concrete mixes. An elaborate experimental program that included a variation of plasticizer and basalt in concrete mixes. The laboratory investigation included measurements of sieve analysis, compressive strength, and slump test. The compressive test was evaluated at 7, 14, 28 days of curing time. The results show significant improvement in concrete strength up to 2% of additive plasticizer after that concrete strength was reduced.

scholarly journals On the evaluation of yield stress of soils for debris flow analysis

2019 ◽  
Vol 92 ◽  
pp. 05002
Author(s):  
Carlos Besso ◽  
Tácio Mauro Pereira de Campos
Keyword(s):  
Debris Flow ◽  
Yield Stress ◽  
Mass Movement ◽  
Flow Analysis ◽  
Rheological Parameters ◽  
Test Results ◽  
Slump Test ◽  
Acceleration And Deceleration ◽  
Cheap Alternative ◽  
Set Up

Debris flow materials behave as a fluid, hence its analysis requires rheological parameters such as yield stress and viscosity. Yield stress is associated to the start and the end of the mass movement downhill in the sense that it denotes the yield transition from the creep to the flow regime, i.e., passage from solid to fluid state. This paper presents an experimental study of the yield stress of a colluvium from Rio de Janeiro, through its determination in a modified set-up of the slump test and in a rotational parallel plate rheometer. Tests were performed in five different water contents above its liquidity limit, providing a fairly good relationship between yield stress and water content. While slump test provides yield stress related to the beginning of the movement (acceleration), rheometer results are related to flow's outset and stoppage. As a result, the percentual differences between yield stresses associated with acceleration and deceleration were less than 5% in all testes, which is related to the low hysteresis effect in the flow curves obtained in the rotational rheometer. Comparing the two methodologies, it is proposed a correction from rheometer to slump test results. Results obtained are compared with data presented in other studies involving soil's yield stress, showing a good acceptance of the slump test results as a cheap alternative to rheometers.

Study on Vibration Properties of Fresh Concrete with Simple Test Method

2015 ◽  
Vol 1110 ◽  
pp. 267-270
Author(s):  
Yuji Yamada ◽  
Shinichiro Hashimoto ◽  
Chikanori Hashimoto ◽  
Takeshi Watanabe ◽  
Shigeyuki Date
Keyword(s):  
Fly Ash ◽  
Fresh Concrete ◽  
Experimental Methods ◽  
Vibration Characteristics ◽  
Test Method ◽  
Simple Test ◽  
Slump Test ◽  
Vibration Properties ◽  
Alternative Test ◽  
Alternative Test Method

It has been reported that, depending on the material used, batches of concrete having the same slump value behave differently when vibrated. It is therefore to be expected that batches of concrete having the same slump value and containing the same amount of powder will have different properties depending on the material used. However, these batches of concrete are treated as concrete of the same quality since, at present, no alternative test method has yet been established as a substitute for the slump test. This study proposed new simplified experimental methods for vibration properties of fresh concrete. By using these methods, the vibration characteristics of fresh concrete containing fly ash (FA) and containing a large amount of cement were exhibited.

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