Synergetic effect of fly ash and silica fume on the performance of high volume fly ash self-compacting concrete

2022 ◽  
Vol 7 (1) ◽  
pp. 61-74
Author(s):  
Shashikant Kumar ◽  
Baboo Rai
Keyword(s):  
Fly Ash ◽  
Silica Fume ◽  
Synergetic Effect ◽  
High Volume ◽  
Self Compacting Concrete ◽  
High Volume Fly Ash

scholarly journals High Volume Fly Ash Self Compacting Concrete with Lime and Silica Fume as Additives

2020 ◽  
Vol 184 ◽  
pp. 01109
Author(s):  
C Chandana Priya ◽  
M V Seshagiri Rao ◽  
V Srinivasa Reddy ◽  
S Shrihari
Keyword(s):  
Fly Ash ◽  
Calcium Hydroxide ◽  
Silica Fume ◽  
High Volume ◽  
Hydrated Lime ◽  
Pozzolanic Reaction ◽  
Self Compacting Concrete ◽  
Conventional Concrete ◽  
High Volume Fly Ash ◽  
Reactive Silica

SCC is expensive when compared with normal conventional concrete. Hence, it is desired to produce low cost SCC by replacing cement with higher percentages of fly ash, which is a no cost material and available in abundance. At the same time to achieve higher grade HVFASCC, micro silica which is otherwise condensed silica fume can also be used along with fly ash to enhance the strength properties of HVFASCC. By replacing fly ash in high volumes in the mix, high amount of pozzolanic material becomes available, majorly reactive silica, for which more calcium hydroxide is necessary for further pozzolanic reaction. As we are reducing cement quantity, the amount of calcium hydroxide available is reduced thus demanding external addition of hydrated lime which can be supplied as additive to cater to the need of calcium hydroxide required for reactive silica in fly ash.The present investigation aims to achieve strength for high volume fly ash self-compacting concrete. The replacement of cement with fly ash is made in 45%, 50%, 55%, 60%, 65% and 70% with 20% hydrated lime and 10% silica fume in one trial. In another trial, 30% hydrated lime and 10% silica fume is added with replacement of fly ash to cement varying in same percentages. The design mix is tested for workability and flowability and cubes are casted for compression strength test and tested at 28 day,, 56 day, and 90 day,.

scholarly journals Mechanical Properties of Silica Fume Modified High-Volume Fly Ash Rubberized Self-Compacting Concrete

2021 ◽  
Vol 13 (10) ◽  
pp. 5571
Author(s):  
Wesam Salah Alaloul ◽  
Muhammad Ali Musarat ◽  
Sani Haruna ◽  
Kevin Law ◽  
Bassam A. Tayeh ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Mechanical Strength ◽  
Silica Fume ◽  
High Volume ◽  
Crumb Rubber ◽  
Self Compacting Concrete ◽  
River Sand ◽  
High Volume Fly Ash ◽  
Constituent Component

The existing form of self-compacting concrete (SCC) comprises of a large amount of powdered and fine materials. In this study, a part of the cementitious material was replaced with constant high-volume fly ash, and a portion of fine aggregates was substituted by crumb rubber (CR). Besides that, silica fume (SF) was added, with the hope that by implementing a new type of nanomaterial, the loss in mechanical strength due to previous modifications such as rubberization and replacement will be prevented. Two variables were found to influence the constituent/component in the mix design: SF and CR. The proportion of SF varies from 0% to 10%, while that of CR from 0% to 30% by volume of the total river sand, where 55% of cement was replaced by the fly ash. A total of 13 rubberized SCC samples with CR and SF as controlling variables were made, and their design mix was produced by a Design of Experiment (DOE) under the Response Surface Methodology (RSM). The results reveal a slight increase in the mechanical properties with the addition of SF. The theoretical mathematical models and equation for each different mechanical strength were also developed after incorporating the experimental results into the software.

Experimental and theoretical study of bond behaviour between FRP bar and high-volume fly ash-self-compacting concrete

2021 ◽  
Vol 54 (1) ◽  
Author(s):  
Yu Zheng ◽  
Nuan Zhou ◽  
Lingzhu Zhou ◽  
Hexin Zhang ◽  
Haotian Li ◽  
...  
Keyword(s):  
Fly Ash ◽  
Theoretical Study ◽  
High Volume ◽  
Self Compacting Concrete ◽  
Bond Behaviour ◽  
High Volume Fly Ash ◽  
Frp Bar

scholarly journals Stress-strain response of high-volume fly ash self-compacting concrete (HVFA-SCC) under uniaxial loading and its effect on the reinforced HVFA-SCC nominal strength

2018 ◽  
Vol 195 ◽  
pp. 02023 ◽  
Author(s):  
Stefanus Kristiawan ◽  
Sunarmasto ◽  
Agus S Budi ◽  
Desi C Kurniawati
Keyword(s):  
Fly Ash ◽  
Flexural Strength ◽  
Mechanical Characteristics ◽  
High Volume ◽  
Experimental Result ◽  
Compression Stress ◽  
Rational Analysis ◽  
Self Compacting Concrete ◽  
Stress Strain ◽  
High Volume Fly Ash

Utilization of High-Volume Fly Ash-Self Compacting Concrete (HVFA-SCC) as a reinforced concrete structural element requires a rational analysis to accommodate the mechanical characteristics of HVFASCC. This study aims to investigate and analyze the mechanical characteristics of HVFA-SCC by examining the experimentally obtained complete stress-strain behavior of this concrete. The results indicate that the compression stress-strain curve of HVFA-SCC is diverse to that of normal concrete (NC) in which the average area under the curve represents 64% to that of NC. Consequently, the equivalent rectangular compression stress for calculating the nominal flexural strength of reinforced HVFASCC section should be modified by a factor of 0.64. Based on this theoretical analysis, a close agreement exists between the predicted nominal flexural strength and the experimental result.

scholarly journals Uji Balok Beton Bertulang Memadat Sendiri High Volume Fly Ash 60% Tanpa dan Dengan Sengkang

2020 ◽  
Vol 8 (4) ◽  
pp. 393
Author(s):  
Muhammad Tsaqif Muhadzib
Keyword(s):  
Fly Ash ◽  
High Volume ◽  
Self Compacting Concrete ◽  
High Volume Fly Ash ◽  
Silica Alumina

<p><em>Self Compacting Concrete</em> (SCC) merupakan inovasi dalam bidang konstruksi dengan berbagai macam kelebihan, namun terdapat kekurangan yaitu SCC memerlukan proporsi semen yang lebih banyak sehingga tidak ramah lingkungan. Material yang dapat menggantikan semen dengan karakteristik yang sama adalah <em>fly ash</em>. <em>Fly ash</em> merupakan sisa pembakaran batu bara yang mengandung silica atau silica alumina dan bersifat pozzolan. Penggunaan <em>fly ash </em>sebagai campuran beton dapat digunakan hingga mencapai &gt;50% dari total semen yang dibutuhkan dan dinamakan <em>High Volume Fly Ash Conccrete</em> (HVFAC). Penelitian ini mengkaji kapasitas geser balok bertulang HVFA-SCC 60% dan balok beton normal. Benda uji yang digunakan dalam penelitian ini memiliki dimensi 10 cm x 18,5 cm x 130 cm dengan 2 titik pembebanan dengan jarak antar beban sebesar 20 cm. Berdasarkan hasil penelitian kapasitas geser balok bertulang HVFA-SCC 60% lebih kecil dibandingkan kapasitas geser balok beton normal yang diuji pada umur 28 hari.</p>

scholarly journals Uji Balok Beton Bertulang Memadat Sendiri High Volume Fly Ash 50% Tanpa dan Dengan Sengkang

2021 ◽  
Vol 8 (3) ◽  
pp. 362
Author(s):  
Febri Arifia
Keyword(s):  
Fly Ash ◽  
High Volume ◽  
Self Compacting Concrete ◽  
High Volume Fly Ash

<p><em>SCC (Self Compacting Concrete) </em>merupakan salah satu inovasi dalam mempermudah pekerjaan infrastruktur<em>. Fly ash</em> adalah sisa-sisa pembakaran batu bara yang berbentuk partikel halus dan merupakan bahan anorganik yang terbentuk dari perubahan bahan mineral karena proses pembakaran dari proses pembakaran batubara. Sifat kimia <em>fly ash</em> menjadikan <em>fly ash</em> digunakan sebagai bahan pengganti semen. Penelitian ini akan mengkaji seberapa besar kapasitas geser balok beton bertulang <em>High Volume Fly Ash </em><em>– </em><em>Self Compacting Concrete</em><em> </em>(HVFA – SCC) dengan kadar <em>f</em><em>ly </em><em>a</em><em>sh</em> 50 % dan kemudian akan dibandingkan dengan balok beton normal. Benda uji yang digunakan balok beton bertulang dengan luas penampang 10 cm x 18,5 cm dengan panjang 130 cm. Pengujian kapasitas geser  menggunakan alat <em>loading frame</em> dengan melakukan 2 titik pembebanan. Dari pengujian ini akan didapatkan grafik hubungan beban-lendutan serta perhitungan kapasitas geser balok beton HVFA-SCC 50%. Berdasarkan hasil penelitian ini kapasitas geser pengujian balok beton HVFA-SCC550% memiliki nilai yang lebih besar dibandingkan dengan kapasitas geser hasil pengujian balok beton normal yang diuji pada umur 28 hari yakni sebesar 30,5  kN untuk HVFA-SCC 50% dan 31,29 kN untuk beton normal.</p>

scholarly journals Pengaruh Kadar Fly Ash terhadap Kuat Tekan (f’c) Material pada High Volume Fly Ash-Self Compacting Concrete (HVFA-SCC) Usia 28 Hari

2018 ◽  
Vol 6 (3) ◽  
Author(s):  
Karina Puspa Amalia ◽  
Agus Setiya Budi ◽  
Sunarmasto Sunarmasto
Keyword(s):  
Fly Ash ◽  
Ball Bearing ◽  
High Volume ◽  
Self Compacting Concrete ◽  
Fly Ash Concrete ◽  
High Volume Fly Ash ◽  
Flow Table

<p class="Default"><em>Fly ash </em>merupakan limbah pembakaran batu bara yang memiliki kandungan kimia berupa silika dan alumina mencapai 80%. Senyawa tersebut bereaksi dengan Ca(OH)<sub>2</sub> hasil proses hidrasi semen dan membentuk C<sub>3</sub>S<sub>2</sub>H<sub>3</sub> atau <em>tubermorite</em> yang dapat menambah kekuatan beton. Secara fisik <em>fly ash </em>memiliki bentuk yang hampir bulat semppurna sehingga memiliki <em>ball bearing effect </em>pada bidang gelincir adukan mortar atau semen. <em>Fly ash </em>sebagai subtituen semen sering digunakan dalam jumlah besar (&gt;50%). Konsep tersebut dikenal dengan <em>High Volume Fly Ash Concrete (HVFAC)</em>. Untuk mengatasi permasalahan terbentuknya rongga pada beton bertulang, konsep HVFAC dipadukan dengan <em>Self Compacting Concrete (SCC). </em>Penelitian ini mengkaji pengaruh persentase <em>fly ash</em> terhadap kuat tekan pada beton HVFA-SCC. Metode penelitian ini adalah eksperimen, dimana digunakan 3 variasi kadar <em>fly ash </em>pada beton HVFA-SCC yaitu 50%, 60%, 70% serta beton normal. Tiap variasi terdiri dari 3 sampel berukuran 75 mm x 150 mm. Pengujian beton segar HVFA-SCC dilakukan dengan 3 metode yaitu : <em>flow table test, L-box test, </em>dan <em>V-funnel test. </em>Hasil pengujian menunjukkan bahwa semakin bertambahnya kadar <em>fly ash </em>maka <em>workability </em>dari beton segar tersebut semakin baik. Pengujian beton keras dilakukan untuk mendapatkan nilai kuat tekan beton. Kuat tekan yang dihasilkan HVFA.28.50, HVFA.28.60, HVFA.28.70, dan NC.28 berturut turut adalah 49,86 MPa, 39,16 MPa, 23,71 MPa, dan 47,78 MPa. Dari hasil pengujian tersebut dapat disimpulkan bahwa semakin banyak penambahan kadar <em>fly ash </em>maka kuat tekan semakin menurun. Hal tersebut diakibatkan karena tidak hanya menurunnya bahan ikat utama beton tetapi juga <em>fly ash </em>belum bereaksi secara optimal pada usia 28 hari.</p>

Sign in / Sign up

Export Citation Format

Share Document