Bétons à haute performance à base de ciments composés contenant du laitier et de la fumée de silice

2003 ◽  
Vol 30 (2) ◽  
pp. 414-428 ◽  
Author(s):  
Mladenka Saric-Coric ◽  
Pierre-Claude Aïtcin
Keyword(s):  
Sustainable Development ◽  
Compressive Strength ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Cementitious Material ◽  
Cement Industry ◽  
Supplementary Cementitious Material ◽  
Cement Replacement ◽  
Furnace Slag ◽  
Scaling Resistance

For each tonne of cement used, the cement industry emits an average of 0.9 t of CO2, which contributes to the greenhouse effect. To satisfy the demands of the concrete industry for cementing materials, new environmental requirements, and the implementation of a sustainable development policy, the use of supplementary cementitious material as a replacement of part of the Portland cement has proven to be an interesting avenue that has not yet been fully explored. Granulated blast-furnace slag has been and is being used as a supplementary cementitious material in replacement of cement in many countries. In Canada, its proportion is usually limited to 20-25% of cement replacement owing to a significant decrease in early age compressive strength as well as a lower scaling resistance. In this study, we have tried to show that by reducing the water:cement ratio we can increase cement replacement by slag up to 50% without harming its short-term compressive strength and scaling resistance. The concretes that were prepared had a workability comparable to that of the reference concrete without slag, sufficient compressive strength to allow demoulding after 24 h, very low chloride ion permeability even at 28 d, as well as very good freeze-thaw and scaling resistance, as long as it is water-cured for a slightly longer period.Key words: high-performance concrete, blast-furnace slag, sustainable development, superplasticizers, workability, durability, silica fume.

Effect of Ground Granulated Blast Furnace Slag on Compressive Strength of POFA Blended Concrete

2015 ◽  
Vol 802 ◽  
pp. 142-148
Author(s):  
M.N. Noor Azline ◽  
Farah Nora Aznieta Abd Aziz ◽  
Arafa Suleiman Juma
Keyword(s):  
Compressive Strength ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Strength Development ◽  
Replacement Level ◽  
Concrete Compressive Strength ◽  
Cement Replacement ◽  
Granulated Blast Furnace Slag ◽  
Strength Tests ◽  
Furnace Slag

The article reports a laboratory experimental programme that investigated effect of ground granulated blast furnace (GGBS) on compressive strength of POFA ternary concrete. Compressive strength tests were performed at a range of cements combinations, including 100%PC, two POFA levels for binary concrete, 35% and 45%, and 15%GGBS inclusion for POFA ternary concrete. The compressive strength results were examined in comparison to PC only and equivalent POFA binary concretes for up to 28 days. Results show that the reduction in compressive strength is greater with the higher cement replacement level for all concretes particularly for POFA binary concretes. However, 15%GGBS in POFA blended concrete has a comparable compressive strength compared to PC concrete at both, 35% and 45%, cement replacement levels except for ternary concrete at 0.65 w/c. In addition, the compressive strength of ternary concrete is slightly higher compared to binary concrete for all concrete combinations. Although there is no significant noticeable influence on strength development, the presence of GGBS did not adverse the strength development of POFA blended concrete. Thus, it can be concluded that GGBS compensates the adverse effect of POFA at early strength development.

scholarly journals Testing the Supplementary Cementitious Material Based on GGBFS and Zeolite for Prediction of the Activity Index

Proceedings ◽  
2018 ◽  
Vol 2 (20) ◽  
pp. 1287
Author(s):  
Marek Kovac ◽  
Alena Sicakova ◽  
Matej Spak
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Activity Index ◽  
Setting Time ◽  
Cementitious Material ◽  
Supplementary Cementitious Material ◽  
Initial Setting Time ◽  
Granulated Blast Furnace Slag ◽  
Initial Setting ◽  
Furnace Slag

The article deals with cement supplementary materials based on ground granulated blast furnace slag and zeolite. Purpose of the experiment was to observe dependences (if they exist) between selected parameters (modulus of basicity, modulus of hydraulicity and initial setting time) and activity indexes, for easier and quicker way to determine or predict the activity index. Testing showed that moderate dependences between those parameters and activity indexes were observed. Results showed that prediction of activity indexes based on chemical composition is feasible.

scholarly journals Blended Cement Containing High Volume Ground Dune Sand and Ground Granulated Blast Furnace Slag for Autoclave Concrete Industry

2015 ◽  
Vol 754-755 ◽  
pp. 395-399 ◽  
Author(s):  
Omer Abdalla Alawad ◽  
Abdulrahman Alhoziamy ◽  
Mohd Saleh Jaafar ◽  
Farah Noor Abdul Aziz ◽  
Abdulaziz Al-Negheimish
Keyword(s):  
Compressive Strength ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Blended Cement ◽  
High Volume ◽  
Dune Sand ◽  
Significant Drop ◽  
Cement Replacement ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

This paper presents the results of using ground dune sand (GDS) and ground granulated blast furnace slag (slag) as high volume cement replacement materials. In this study, plain and four blended mixtures were fabricated and cured under normal and autoclave conditions. For the blended mixtures, 40% GDS by weight of the total binder materials and different percentages of slag (15%, 30% and 45%) were incorporated as partial cement replacement materials. The effect of curing conditions (normal and autoclave) on the compressive strength of prepared mixtures was studied. The results showed that, for the autoclave cured mixture, up to 85% of cement can be replaced by GDS and slag without significant drop in the compressive strength. Microstructure analyses using scanning electron microscope (SEM) and X-ray diffraction analysis (XRD) were carried out to examine the microscale changes of the hydrated mixtures. The SEM revealed the formation of thin plate-like calcium silicate hydrate and compacted microstructure of autoclave cured mixture. XRD showed the elimination of calcium hydroxide and existence of residual crystalline silica of all blended mixtures.

scholarly journals Compressive Strength and Microstructure Properties of Alkali-Activated Systems with Blast Furnace Slag, Desulfurization Slag, and Gypsum

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Bong-Suk Cho ◽  
Kyung-Mo Koo ◽  
Se-Jin Choi
Keyword(s):  
Compressive Strength ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Construction Material ◽  
Steel Slag ◽  
Steel Production ◽  
Value Added ◽  
Cement Industry ◽  
Furnace Slag ◽  
Alkali Activated

This study investigates the effect of desulfurization slag (DS) and gypsum (G) on the compressive strength and microstructure properties of blast furnace slag-(BFS-) based alkali-activated systems. DS is produced in a Kambara reactor process of molten iron produced in a steel production process. DS contains CaO, SiO2, Fe2O3, and SO3 and is composed of Ca(OH)2 and 2CaO·SiO2 as main compounds. In this investigation, the weight of BFS was replaced by DS at 5, 10, 15, 20, 25, and 30%. In addition, G was also applied at 9, 12, and 15% by weight of BFS to improve the compressive strength of the alkali-activated system with BFS and DS. According to this investigation, the compressive strength of the alkali-activated mixes with BFS and DS ranged from 14.9 MPa (B95D5) to 19.8 MPa (B90D10) after 91 days. However, the 28 days compressive strength of the alkali-activated mixes with BFS, DS, and G reached 39.1 MPa, 45.2 MPa, and 48.4 MPa, respectively, which were approximately 78.8 to 97.5% of that of O100 mix (49.6 MPa). The main hydrates of the BFS-DS (B80D20) binder sample were Ca(OH)2, CaCO3, and low-crystalline calcium silicate hydrates, while the main hydration product of BFS-DS-G (B75D10G15) binder was found as ettringite. The use of BFS-DS-G binders would result in the value-added utilization of steel slag and provide an environmentally friendly construction material, and contribute to a reduction of CO2 in the cement industry.

Use of air-cooled blast furnace slag as supplementary cementitious material for self-compacting concrete production

2020 ◽  
Vol 262 ◽  
pp. 120102 ◽  
Author(s):  
Paulo R. de Matos ◽  
Jade C.P. Oliveira ◽  
Taísa M. Medina ◽  
Diego C. Magalhães ◽  
Philippe J.P. Gleize ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Cementitious Material ◽  
Self Compacting Concrete ◽  
Supplementary Cementitious Material ◽  
Concrete Production ◽  
Furnace Slag

scholarly journals the use of blast furnace slag as a supplementary cementitious material

2021 ◽  
Vol 1973 (1) ◽  
pp. 012136
Author(s):  
Hussein Abd Alrutha Hanash ◽  
Maan S. Hassan ◽  
Ayat M. Hussein
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Cementitious Material ◽  
Supplementary Cementitious Material ◽  
Furnace Slag

The Effect of Blast Furnace Slag on Foam Concrete in Terms of Compressive Strength

2012 ◽  
Vol 587 ◽  
pp. 81-87 ◽  
Author(s):  
Zaid Shaker Aljoumaily ◽  
Norizal Noordin ◽  
Hanizam Awang ◽  
Mohammed Zuhear Almulali
Keyword(s):  
Compressive Strength ◽  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
Foam Concrete ◽  
Cement Replacement ◽  
Pozzolanic Material ◽  
Class F Fly Ash ◽  
Furnace Slag ◽  
Class F

This study is a part of an on-going research studying the effect of blast furnace slag as a binder and filler replacement on the properties of fresh and hardened foam concrete. A mix having the density of 1300kg/m3 with a proportion of (1 cement:2 sand), W/C ratio of 0.45, a commercially available additive (SP-1), class F fly ash and a unprocessed blast furnace slag was used. The results show that the mix containing the slag achieved a higher compressive strength (6.31MPa at 28 days) than that of the control mix at the same age (5.81MPa). In addition, combining both slag and fly ash as a cement replacement further enhanced the compressive strength achieving higher compressive strengths. Also, a more stable mix was achieved by the slag replacement when compared to the control mix. This result concludes that the unprocessed slag is a good pozzolanic material that can be used with foam concrete.

The Influence of the Properties of the Material Used for Obtaining Geopolymers on Their Structure and Compressive Strength

2017 ◽  
Vol 68 (6) ◽  
pp. 1182-1187
Author(s):  
Ilenuta Severin ◽  
Maria Vlad
Keyword(s):  
Compressive Strength ◽  
Blast Furnace ◽  
Wheat Straw ◽  
Red Mud ◽  
Blast Furnace Slag ◽  
Complex Structure ◽  
Point Of View ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag ◽  
Straw Ash

This article presents the influence of the properties of the materials in the geopolymeric mixture, ground granulated blast furnace slag (GGBFS) + wheat straw ash (WSA) + uncalcined red mud (RMu), and ground granulated blast furnace slag + wheat straw ash + calcined red mud (RMc), over the microstructure and mechanical properties of the synthesised geopolymers. The activation solutions used were a NaOH solution with 8M concentration, and a solution realised from 50%wt NaOH and 50%wt Na2SiO3. The samples were analysed: from the microstructural point of view through SEM microscopy; the chemical composition was determined through EDX analysis; and the compressive strength tests was done for samples tested at 7 and 28 days, respectively. The SEM micrographies of the geopolymers have highlighted a complex structure and an variable compressive strength. Compressive strength varied from 24 MPa in the case of the same recipe obtained from 70% of GGBFS + 25% WSA +5% RMu, alkaline activated with NaOH 8M (7 days testing) to 85 MPa in the case of the recipe but replacing RMu with RMc with calcined red mud, alkaline activated with the 50%wt NaOH and 50%wt Na2SiO3 solution (28 days testing). This variation in the sense of the rise in compressive strength can be attributed to the difference in reactivity of the materials used in the recipes, the curing period, the geopolymers structure, and the presence of a lower or higher rate of pores, as well as the alkalinity and the nature of the activation solutions used.

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