Mix design and properties of lightweight self-consolidating concretes developed with furnace slag, expanded clay and expanded shale aggregates

2015 ◽  
Vol 5 (5) ◽  
pp. 297-323 ◽  
Author(s):  
Abdurrahmaan Lotfy ◽  
Khandaker M.A. Hossain ◽  
Mohamed Lachemi
Keyword(s):  
Mix Design ◽  
Expanded Shale ◽  
Furnace Slag

scholarly journals Lightweight Self-consolidating Concrete: Statistical Modelling, Mixture Design And Performance Evaluation

2021 ◽  
Author(s):  
Abdurrahmaan Lotfy
Keyword(s):  
Total Content ◽  
Statistical Modelling ◽  
Mix Design ◽  
Lightweight Aggregates ◽  
Split Tensile Strength ◽  
Relative Significance ◽  
Self Consolidating Concrete ◽  
Hardened Properties ◽  
Expanded Shale ◽  
Furnace Slag

A response surface method based experimental study was carried out to model the influence of key parameters on properties of Lightweight Self-Consolidating Concrete (LWSCC) mixtures developed with various types of lightweight aggregates namely, furnace slag (FS), expanded clay (EC), and expanded shale (ESH). Three key parameters were selected to derive mathematical models for evaluating fresh and hardened properties. Water/binder ratio of 0.30 to 0.40, high range water reducing agent (HRWRA) of 0.3 to 1.2% (by total content of binder) and total binder content of 410 to 550 kg/m3 were used for the design of LWSCC mixtures. Slump flow diameter, V-funnel flow time, J-ring flow diameter, J-ring height difference, L-box ratio, filling capacity, bleeding, fresh air content, initial and final set times, sieve segregation, fresh/28-day air/oven dry unit weights and 7- and 28-day compressive strengths were evaluated. Utilizing the developed model, three optimum LWSCC mixes with high desirability were formulated and tested for mechanical, mass transport and durability characteristics. The optimized industrial LWSCC mixtures were produced in lab/industrial set-up with furnace slag, expanded clay, and expanded shale aggregates. The mixtures were evaluated by conducting compressive/flexural/split tensile strength, bond strength (pre/post corrosion), drying shrinkage, sorptivity, absorption, porosity, rapid chloride-ion permeability, hardened air void (%), spacing factor, corrosion resistance, resistance to elevated temperature, salt scaling, freeze-thaw iv resistance, and sulphuric acid resistance tests. It was possible to produce robust LWSCC mixtures that satisfy the European EFNARC criteria for Self-Consolidating Concrete (SCC). The proposed mix design model is proved to be a useful tool for understanding the interactions among mixture parameters that affect important characteristics of LWSCC. This understanding might simplify the mix design process and the required testing, as the model identifies the relative significance of each parameter, provides important information required to optimize mix design and consequently minimizes the effort needed to optimize LWSCC mixtures, and ensures balance among parameters affecting fresh and hardened properties. LWSCCs with FS, EC and ESH lightweight aggregates can reduce the construction pollution, increase the design solutions, extend the service life of the structure and hence, promote sustainability in construction industry.

scholarly journals Lightweight Self-consolidating Concrete: Statistical Modelling, Mixture Design And Performance Evaluation

2021 ◽  
Author(s):  
Abdurrahmaan Lotfy
Keyword(s):  
Total Content ◽  
Statistical Modelling ◽  
Mix Design ◽  
Lightweight Aggregates ◽  
Split Tensile Strength ◽  
Relative Significance ◽  
Self Consolidating Concrete ◽  
Hardened Properties ◽  
Expanded Shale ◽  
Furnace Slag

A response surface method based experimental study was carried out to model the influence of key parameters on properties of Lightweight Self-Consolidating Concrete (LWSCC) mixtures developed with various types of lightweight aggregates namely, furnace slag (FS), expanded clay (EC), and expanded shale (ESH). Three key parameters were selected to derive mathematical models for evaluating fresh and hardened properties. Water/binder ratio of 0.30 to 0.40, high range water reducing agent (HRWRA) of 0.3 to 1.2% (by total content of binder) and total binder content of 410 to 550 kg/m3 were used for the design of LWSCC mixtures. Slump flow diameter, V-funnel flow time, J-ring flow diameter, J-ring height difference, L-box ratio, filling capacity, bleeding, fresh air content, initial and final set times, sieve segregation, fresh/28-day air/oven dry unit weights and 7- and 28-day compressive strengths were evaluated. Utilizing the developed model, three optimum LWSCC mixes with high desirability were formulated and tested for mechanical, mass transport and durability characteristics. The optimized industrial LWSCC mixtures were produced in lab/industrial set-up with furnace slag, expanded clay, and expanded shale aggregates. The mixtures were evaluated by conducting compressive/flexural/split tensile strength, bond strength (pre/post corrosion), drying shrinkage, sorptivity, absorption, porosity, rapid chloride-ion permeability, hardened air void (%), spacing factor, corrosion resistance, resistance to elevated temperature, salt scaling, freeze-thaw iv resistance, and sulphuric acid resistance tests. It was possible to produce robust LWSCC mixtures that satisfy the European EFNARC criteria for Self-Consolidating Concrete (SCC). The proposed mix design model is proved to be a useful tool for understanding the interactions among mixture parameters that affect important characteristics of LWSCC. This understanding might simplify the mix design process and the required testing, as the model identifies the relative significance of each parameter, provides important information required to optimize mix design and consequently minimizes the effort needed to optimize LWSCC mixtures, and ensures balance among parameters affecting fresh and hardened properties. LWSCCs with FS, EC and ESH lightweight aggregates can reduce the construction pollution, increase the design solutions, extend the service life of the structure and hence, promote sustainability in construction industry.

scholarly journals New technology in 3D Concrete Printing by Using Ground Granulated Blast-Furnace Slag: A Review

2021 ◽  
Vol 1200 (1) ◽  
pp. 012007
Author(s):  
Norhafizah Salleh ◽  
Nur Syahera Jamalulail ◽  
Noor Azlina Abdul Hamid ◽  
Zalipah Jamellodin ◽  
Masni A Majid ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Blast Furnace ◽  
3D Printing ◽  
Blast Furnace Slag ◽  
Research Study ◽  
Mix Design ◽  
Co2 Gas ◽  
Granulated Blast Furnace Slag ◽  
Carbon Dioxide Co2 ◽  
Furnace Slag

Abstract 3D building printing is a technology for producing 3D models of an object to build any shape or size in layers by using computer software. The development of 3D printing was going to be more famous and commercial in the future to reduce the construction cost and labor demands, sustainability, and to the greenest way. Concrete is the mixture that consists of the ingredients of water, binder (cement) and aggregates (rock, sand, gravel). The productions of Portland cement in construction leads to the emissions of carbon dioxide (CO2) gas into the air. Waste material has been used as cement replacement in this research study to reduce carbon dioxide (CO2) gas emissions. This research study was going to evaluate the viability of concrete for 3D printing and printing emphasizing the impact on potential opportunities of this innovative industry. The behaviour of 3D concrete printing and potential of modified mortar in 3D concrete mix design by using Ground Granulated Blast-Furnace Slag (GGBS) is used to evaluate the potential uses of GGBS in concrete mixture for 3D building printing. This research study involved the review of concrete compressive strength and workability of 3D concrete printing with the control aspect during process manufacturing. The result shows that the mix design of 3D concrete printing with 30% and 40% produced concrete strength of 47.33MPa and 47.67MPa respectively. Furthermore, control aspect requirements of concrete for 3D printing were discussed in the field extrudability, flowability, buildability, strength between layers, aggregates, and water-cement ratio. Throughout this study, the manufactures of 3D building printing materials using environmentally friendly elements can contribute effectively create a sustainable environment automatically.

Options for Improving the Workability of High Performance Concrete

2015 ◽  
Vol 1106 ◽  
pp. 53-56 ◽  
Author(s):  
Michal Ženíšek ◽  
Tomáš Vlach ◽  
Lenka Laiblová
Keyword(s):  
Blast Furnace Slag ◽  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Mix Design ◽  
Correct Selection ◽  
Cement Ratio ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag ◽  
Selection Of

A low water-cement ratio is one of the main characteristics of high performance concrete thanks to high strength of concrete is achieved. However, it leads to deterioration of the rheological properties and therefore it is necessary to use a plasticizing admixtures. Other options to influence workability are introduced in this article. There is studied the correct selection of cement, the temperature of water, the particle size distribution of aggregates (packing density) and the use of ground granulated blast furnace slag (GGBS). The performed experiments show a greater or lesser influence all studied options on the workability. Therefore this options is appropriate to keep in mind during mix design of high performance concrete.

Mix Design Proposed for Geopolymer Concrete Mixtures Based on Ground Granulated Blast furnace slag

2020 ◽  
Vol 18 (2) ◽  
pp. 205-218
Author(s):  
A. Serag Faried ◽  
W. H. Sofi ◽  
Al-Zahraa Taha ◽  
Magdy A. El-Yamani ◽  
Taher A. Tawfik
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Mix Design ◽  
Geopolymer Concrete ◽  
Granulated Blast Furnace Slag ◽  
Concrete Mixtures ◽  
Furnace Slag

scholarly journals Study on effect of strength and durability parameters and performance of Self Compacting Concrete replacement with GGBS at different dosages

2020 ◽  
Vol 184 ◽  
pp. 01106
Author(s):  
A Vittalaiah ◽  
Rathod Ravinder ◽  
C Vivek Kumar
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Mix Design ◽  
European Federation ◽  
Fine Aggregate ◽  
Self Compacting Concrete ◽  
Granulated Blast Furnace Slag ◽  
Slump Flow ◽  
Super Plasticizer ◽  
Furnace Slag

To investigate experimentally, the behavior of exterior beam-column joint and strength characteristics of Self Compacting Concrete (SCC) containing Viscosity Modifying Admixture (VMA), and Ground Granulated Blast Furnace Slag (GGBFS). Since there is no standard method of mix design is available for SCC. Hence mix design was arrived as per the rules of European Federation of National Associations Representing for Concrete (EFNARC). Marsh cone test was used to find the saturation of various kind of cements by adding the dosage of super plasticizer accordingly. In this investigation SCC was made by usual ingredients such as cement, fine aggregate, coarse aggregate, water and ground granulated blast furnace slag at various replacement levels (10%, 20%, 30%, 40%, and 50%), with that the Super Plasticizer (Glenium B233) and viscosity modifying agent (Glenium Stream 2) was used in appropriate amount for achieving the better flow in the concrete. The experiments were carried out by maintaining a constant water-powder ratio of 0.45. At various replacement levels the performance of freshly prepared SCC is checked by conducting tests such as slump flow, T50 slump flow, U-tube, L-box and V-funnel tests. Mechanical characteristics like Compressive, Split-tensile and Flexural strength examined. Also, the durability study for SCC after 28, 56 and 90 days curing was done by conducting a number of the tests like saturated water absorption, porosity, carbonation depth and alkalinity measurement

Sign in / Sign up

Export Citation Format

Share Document