Experimental Verification of Chemical Admixture to Reduce Stiffness of Concrete

2020 ◽  
Vol 853 ◽  
pp. 198-208
Author(s):  
Hiroshi Nemoto ◽  
Shuya Hirano ◽  
Shin-Ichiro Hashimoto ◽  
Shigeyuki Date
Keyword(s):  
Experimental Verification ◽  
Shear Test ◽  
Microscopic Image ◽  
Performance Tests ◽  
Simple Test ◽  
Construction Work ◽  
Chemical Admixture ◽  
Vane Shear Test ◽  
Verification Test ◽  
Occurrence Mechanism

In this paper, the phenomenon in which the fluidity drops significantly once the concrete, which is a problem in the construction work, is called “stiffness”, and the hypothesis of the occurrence mechanism was hypothesized based on a microscopic image of cement paste. Then, author developed a chemical admixture (stiffness reducing agent) that suppresses the aggregation of cement particles and verified the effect through various tests. In the verification test, author tried to quantify the stiffness of concrete by a simple test called the vane shear test. Also, through various construction performance tests, author confirmed the possibility of stiffness affecting the construction work.

scholarly journals STUDI PENINGKATAN KARAKTERISTIK TANAH LEMPUNG DENGAN SERAT TANDAN KOSONG KELAPA SAWIT

2018 ◽  
Vol 7 (02) ◽  
pp. 97-103
Author(s):  
Misnawati Misnawati
Keyword(s):  
Shear Test ◽  
Vane Shear Test

Stabilisasi tanah dimaksudkan untuk memperbaiki sifat-sifat tanah asli dengan cara antara lain menambahkan suatu bahan tertentu yang mengakibatkan perubahan sifat-sifat tanah asli. Selama ini penggunanaan serat tandan kosong banyak dihasilkan oleh industri perkebunan kelapa sawit. Serat merupakan jumlah terbesar ketiga setelah CPO dan tandan kosong kelapa sawit, tandan buah segar diperkirakan mengandung 14 - 15%. Serat dapat dimanfaatkan sebagai bahan bakar alternatif energi pembangkit listrik, pembuatan kertas dan sebagai bahan campuran makanan ternak. Tapi sekarang serat juga digunakan untuk material konstruksi. Penelitian ini dilakukan untuk menyelidiki prosentase optimum serat untuk mendapatkan kepadatan maksimum, menganalisis peningkatan nilai CBR tanah setelah penambahan serat, menganalisis peningkatan nilai qu pada pengujian UCT tanah setelah penambahan serat, menganalisis peningkatan nilai su pada pengujian vane shear test tanah setelah penambahan serat. Penelitian dilakukan dengan mencampurkan serat tandan kosong kelapa sawit dengan tanah lempung lunak dengan kadar serat masing-masing 5%, 6%, 7%, dan 8%. Hasil pencampuran diharapkan dapat diketahui nilai bagaimana hubungan dari berbagai variasi prosen penambahan serat tandan kosong kelapa sawit guna mendapatkan tujuan yang diharapkan, selain itu hasil yang diperoleh diharapkan dapat memperbaiki kualitas tanah menjadi lebih baik. Berdasarkan hasil analisis dari penelitian ini, bahwa adanya penambahan serat tandan kosong kelapa sawit di dalam tanah lunak maka dapat memperbaiki kekuatan tanah tersebut sehingga menjadi meningkat dan hasil penelitian ini dapat digunakan sebagai acuan untuk stabilisasi tanah lempung.

Effects of Probe Marks on Shear Test of Copper Ball Bonds in Two Pad Aluminum Thicknesses

2016 ◽  
Vol 2016 (1) ◽  
pp. 000219-000226 ◽  
Author(s):  
Priscila Brown ◽  
Rachel Wynder ◽  
Dustin Tenney ◽  
Stevan Hunter
Keyword(s):  
Image Analysis ◽  
Shear Force ◽  
Shear Test ◽  
Physical Factors ◽  
Microscopic Image ◽  
Test Results ◽  
Contact Areas ◽  
Ball Bonds ◽  
Optical Microscopic Image ◽  
Bond Pads

Abstract This paper continues the work of reference [1], evaluating shear test results of Cu ball bonds over a variety of probe marks in two different pad aluminum (Al) thicknesses (0.8μm and 3μm). The presence of invasive probe marks on thick Al bond pads lowers certain shear force results.. Lower values of shear force imply reduced Cu bond reliability. Physical factors are investigated relating to poor intermetallic (IMC) formation in the Cu wirebond and bond shear force. Optical microscopic image analysis of Cu bonds, bond contact areas and Al “splash” are studied for correlation with the shear test results. Percent IMC coverage of bond contact areas decrease when invasive probe marks are present beneath the bond, which in turn may reduce the shear force. Probe mark features are studied to discover the characteristics of greatest influence on % IMC coverage and shear test values in each of the pad metal thicknesses.

scholarly journals Interpretation of Shear mode on Vane Shear test by X-ray CT Scan

2017 ◽  
Vol 12 (1) ◽  
pp. 79-90 ◽  
Author(s):  
Shunzo KAWAJIRI ◽  
Masanori TANAKA ◽  
Takayuki KAWAGUCHI ◽  
Yukiko NAOHARA ◽  
Hiroshi HIRABAYASHI ◽  
...  
Keyword(s):  
Ct Scan ◽  
Shear Test ◽  
Shear Mode ◽  
X Ray ◽  
Vane Shear Test

Image Analysis-Based Estimation of Metallic and Pearl Add-Ons Concentrations in Automotive Paints

2014 ◽  
Vol 19 (2-3) ◽  
pp. 119-126
Author(s):  
Krzysztof Ślot ◽  
Krzysztof Strzecha ◽  
Grzegorz Nowak
Keyword(s):  
Image Analysis ◽  
Image Segmentation ◽  
Experimental Verification ◽  
Focal Plane ◽  
Dopant Concentration ◽  
Microscopic Image ◽  
Automotive Paint ◽  
Pigment Color ◽  
Preliminary Research ◽  
Concentration Assessment

Abstract The paper reports results of preliminary research on automotive paint dopant concentration assessment based on microscopic image segmentation. The considered task is illconditioned due to the richness and diversity in contents of images to be analyzed. The proposed procedure involves two main phases: image segmentation, where focal-plane paint addons are extracted from the background, and object analysis and classification. The results of experimental verification of the proposed method on a set of eighteen paint pigmented images (black and yellow) show that the estimation can be done with approximately 5% accuracy for paints doped with only single addon type. For add-on mixtures, the results were strongly dependent on pigment color and mutual add-on proportions.

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