scholarly journals HYDRATION REACTION AND CONSIDERATIONS FOR SOILS TREATED BY BLAST-FURNACE SLAG, ANHYDRITE AND LIME STONE POWDER

2021 ◽  
Vol 74 (1) ◽  
pp. 349-356
Author(s):  
Takumi INO ◽  
Tsuyoshi SAITO ◽  
Kazuho SUZUKI ◽  
Tatsuhiko SAEKI
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Hydration Reaction ◽  
Lime Stone ◽  
Furnace Slag

scholarly journals Synergistic Excitation Mechanism of CaO-SiO2-Al2O3-SO3 Quaternary Active Cementitious System

2021 ◽  
Vol 8 ◽  
Author(s):  
Fusheng Niu ◽  
Yukun An ◽  
Jinxia Zhang ◽  
Wen Chen ◽  
Shengtao He
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Steel Slag ◽  
Cementitious Materials ◽  
Test Block ◽  
Hydration Reaction ◽  
Alkaline Environment ◽  
Granulated Blast Furnace Slag ◽  
Cementitious System ◽  
Furnace Slag

In this study, the influence of steel slag (SS) content on the strength of the cementitious materials was investigated. The quaternary active cementitious material (CaO-SiO2-Al2O3-SO3) was prepared using various proportions of steel slag (SS), granulated blast furnace slag (BFS), and desulfurized gypsum (DG). The mechanism of synergistic excitation hydration of the cementitious materials was examined using various techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectrometry (FTIR). The strength of the mortar test block was initially increased and decreased later with the increase of the SS content. Mortar test block with 20% steel slag, 65% granulated blast furnace slag, and 15% desulfurized gypsum with 0.35 water-binder ratio showed the highest compressive strength of 57.3 MPa on 28 days. The free calcium oxide (f-CaO) in the SS reacted with water and produced calcium hydroxide (Ca(OH)2) which created an alkaline environment. Under the alkaline environment, the alkali-activated reaction occurred with BFS. In the early stage of hydration reaction, calcium silicate hydrate (C-S-H) gel and fibrous hydration product ettringite (AFt) crystals were formed, which provided early strength to the cementitious materials. As the hydration reaction progressed, the interlocked growth of C-S-H gel and AFt crystals continued and promoted the increase of the strength of the cementitious system.

scholarly journals LONG-TERM HYDRATION REACTION OF HIGH BLAST-FURNACE SLAG CEMENT

2010 ◽  
Vol 64 (1) ◽  
pp. 48-53
Author(s):  
Takeshi ANSAI ◽  
Makoto NISHIKAWA ◽  
Yosaku IKEO ◽  
Etsuo SAKAI
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Hydration Reaction ◽  
Slag Cement ◽  
Furnace Slag

scholarly journals HYDRATION REACTION ANALYSIS OF CEMENT HAVING HIGH BLAST-FURNACE SLAG

2009 ◽  
Vol 63 (1) ◽  
pp. 22-27 ◽  
Author(s):  
Takeshi ANSAI ◽  
Makoto NISHIKAWA ◽  
Yosaku IKEO ◽  
Etsuo SAKAI
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Hydration Reaction ◽  
Furnace Slag

A Study on the pH Value Changes of Blended Cement Paste According to the Carbonation

2008 ◽  
Vol 385-387 ◽  
pp. 625-628
Author(s):  
Sang Hyun Lee ◽  
Han Seung Lee
Keyword(s):  
Blast Furnace ◽  
Quantitative Analysis ◽  
Blast Furnace Slag ◽  
Ph Value ◽  
Blended Cement ◽  
Hydration Reaction ◽  
Value Changes ◽  
Blended Cement Paste ◽  
Furnace Slag ◽  
Test Result

Life span of structures made with concrete was shortened by carbonation. This phenomenon makes pH in concrete lower. If pH value in concrete become below 10, rebar in concrete begin to be corroded. This pH value was effected by quantity of Ca(OH)2 that depends on cement types, hydration reaction and carbonation time. In this study, pH value and quantity of Ca(OH)2 in mortar which has blast furnace slag were tested according to hydration and carbonation time. As a test result, the more cement has blast furnace slag (BFS) and the longer carbonation time last, the lower pH value in mortar has. And using this quantitative analysis result of pH and Ca(OH)2, it may be used effectively when service life considering carbonation is predicted using FEMA.

EXPERIMENTAL STUDY ON THE SULFURIC ACID RESISTANCE OF LOW CARBON CONCRETE

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Hiyori Ishizuka ◽  
Hiromi Fujiwara ◽  
Masanori Maruoka ◽  
Tao Wang ◽  
Shintaro Tanaka
Keyword(s):  
Blast Furnace ◽  
Sulfuric Acid ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
Fine Powder ◽  
Acid Resistance ◽  
Hydration Reaction ◽  
Low Carbon ◽  
Countermeasures Research ◽  
Furnace Slag

In recent years, deterioration of concrete structures of sewerage facilities due to sulfuric acid attacks has been progressing. Therefore, it can be concluded that the demand for sulfur-acid resistant concrete is extremely high. In addition, concerning recent global warming countermeasures, research and development is underway on low-carbon concrete that reduced cement, which emits a large amount of carbon dioxide during the manufacturing process. The purpose of this study is to develop low carbon concrete with high sulfur-acid resistance by replacing cement with large amounts of blast furnace slag and various admixtures. As a result, it was found that the sulfur-acid resistance was improved when using blast furnace slag fine powder and fly-ash. In particular, when cement content was 20% of binder by mass, it was confirmed that the sulfur-acid resistance was excellent. What is more, there was no loss in compressive strength. It was considered that almost Ca(OH) produced by hydration reaction of cement reacted with blast furnace slag and fly-ash, so the reaction of sulfur-acid and calcium hydroxide was suppressed.

scholarly journals Pengaruh Penambahan Limestone terhadap Kuat Tekan Semen Portland Komposit

2018 ◽  
Vol 11 (2) ◽  
pp. 86
Author(s):  
Irfan Purnawan ◽  
Andi Prabowo
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Blended Cement ◽  
Composite Cement ◽  
Lime Stone ◽  
Furnace Slag

Semen merupakan bahan dasar utama konstruksi bangunan, sehingga menjadikan semen sebagai komoditi yang strategis. Semen PCC (Portland Composite Cement) merupakan jenis semen varian baru yang mempunyai karakteristik mirip dengan semen Portland, tetapi semen jenis ini mempunyai kualitas yang lebih baik, ramah lingkungan dan mempunyai harga yang lebih ekonomis. Penambahan limestone sebagai aditif berfungsi meningkatkan kuat tekan pada semen. Tujuan penelitian ini adalah mengetahui pengaruh penambahan limestone dengan berbagai variasi terhadap kuat tekan dan menentukan massa limestone yang dapat memberikan kuat tekan maksimum pada semen Portland komposit. Pembuatan semen Portland komposit dilakukan dengan penambahan limestone sebagai aditif. Variasi limestone yang ditambakan adalah 0, 5, 10, 15, 20 dan 25%. Pengaruh penambahan limestone dapat diketahui dari hasil uji kehalusan, uji residu, uji komposisi kimia semen dan uji kuat tekan semen. Hasil penelitian menunjukan bahwa semakin besar persentase pemakaian limestone di dalam blended cement maka nilai residu dan nilai kehalusan akan semakin besar namun nilai kuat tekan akan semakin rendah. Kuat tekan semen yang tertinggi yaitu nilai kuat tekan pada umur 2 hari. Komposisi terbaik aditif limestone di dalam blended cement adalah 77% klinker, 15% lime stone, 3% gypsum dan 5% blast furnace slag

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