Bond performance of reinforced alkali-activated composites using water-quenched slag as alternative fine aggregates

Structures ◽  
2020 ◽  
Vol 24 ◽  
pp. 137-150 ◽  
Author(s):  
Xinyu Cong ◽  
Wei Zhou ◽  
Mohamed Elchalakani
Keyword(s):  
Bond Performance ◽  
Fine Aggregates ◽  
Alkali Activated

Utilizing alkali-activated materials as ordinary Portland cement replacement to study the bond performance of fiber-reinforced polymer bars in seawater sea-sand concrete

2022 ◽  
pp. 136943322110651
Author(s):  
Ruiming Cao ◽  
Bai Zhang ◽  
Luming Wang ◽  
Jianming Ding ◽  
Xianhua Chen
Keyword(s):  
Tensile Strength ◽  
Bond Strength ◽  
Ordinary Portland Cement ◽  
Concrete Strength ◽  
Fiber Reinforced Polymer ◽  
Bond Performance ◽  
Reinforced Polymer ◽  
Sea Sand ◽  
Frp Bars ◽  
Alkali Activated

Alkali-activated materials (AAMs) are considered an eco-friendly alternative to ordinary Portland cement (OPC) for mitigating greenhouse-gas emissions and enabling efficient waste recycling. In this paper, an innovative seawater sea-sand concrete (SWSSC), that is, seawater sea-sand alkali-activated concrete (SWSSAAC), was developed using AAMs instead of OPC to explore the application of marine resources and to improve the durability of conventional SWSSC structures. Then, three types of fiber-reinforced polymer (FRP) bars, that is, basalt-FRP, glass-FRP, and carbon-FRP bars, were selected to investigate their bond behavior with SWSSAAC at different alkaline dosages (3%, 4%, and 6% Na2O contents). The experimental results manifested that the utilization of the alkali-activated binders can increase the splitting tensile strength ( ft) of the concrete due to the denser microstructures of AAMs than OPC pastes. This improved characteristic was helpful in enhancing the bond performance of FRP bars, especially the slope of bond-slip curves in the ascending section (i.e., bond stiffness). Approximately three times enhancement in terms of the initial bond rigidity was achieved with SWSSAAC compared to SWSSC at the same concrete strength. Furthermore, compared with the BFRP and GFRP bars, the specimens reinforced with the CFRP bars experienced higher bond strength and bond rigidity due to their relatively high tensile strength and elastic modulus. Additionally, significant improvements in initial bond stiffness and bond strength were also observed as the alkaline contents (i.e., concrete strength) of the SWSSAAC were aggrandized, demonstrating the integration of the FRP bars and SWSSAAC is achievable, which contributes to an innovative channel for the development of SWSSC pavements or structures.

scholarly journals Research on Eco-friendly Alkali Activated Concrete Incorporating Industrial Wastes

2019 ◽  
Vol 8 (9S2) ◽  
pp. 477-482
Keyword(s):  
Raw Materials ◽  
Sodium Hydroxide Solution ◽  
Industrial Wastes ◽  
Liquid Sodium ◽  
Alkali Activation ◽  
Waste Glass Powder ◽  
Fine Aggregates ◽  
Alkaline Activator ◽  
Alkali Activated Concrete ◽  
Alkali Activated

In the present scenario, the production of green and sustainable concrete has become a must to substitute the ordinary Portland cement (OPC) concrete. It is an eminent fact that the manufacture of OPC requires burning of its raw materials which lead to a huge amount of carbon dioxide liberation; thus it requires a large amount of energy dissipation. The concrete produced using alkali activation has become renowned methods to replace the conventional OPC, which gives an answer to find a way to produce environmentally friendly concrete. In the current study, the alkaline activator used to activate the binder was sodium hydroxide solution dispersed in liquid sodium silicate. The utilization of industrial dissipate materials such as GGBS, fly ash, and waste glass powder was used as the binding ingredients, and stone crusher dust was used as fine aggregates. The experimental investigation showed that a quality concrete can be easily produced using alkali activation of industrial wastes satisfying its strength requirements. The statistical models developed shown that there is a significant relationship between various cube and cylinder strengths. Thus alkali-activated concrete(AAC) can effectively reduce the environmental hazards associated with OPC concrete, which also provides an effective way of utilizing major industrial byproducts

scholarly journals Flexural Fatigue performance of Alkali Activated Slag Concrete mixes incorporating Copper Slag as Fine Aggregate

2015 ◽  
Vol 10 (1) ◽  
pp. 7-18 ◽  
Author(s):  
B.M. Mithun ◽  
M.C. Narasimhan ◽  
Palankar Nitendra ◽  
A.U. Ravishankar
Keyword(s):  
Mechanical Properties ◽  
Plain Concrete ◽  
Copper Slag ◽  
Fatigue Performance ◽  
Fine Aggregate ◽  
River Sand ◽  
Alkali Activated Slag ◽  
Fine Aggregates ◽  
Activated Slag ◽  
Alkali Activated

Abstract The present investigation attempts a detailed study of mechanical properties and fatigue characteristics of a new class of Alkali Activated Slag Concrete (AASC) mixes incorporating Copper Slag (CS) as fine aggregates. The natural river sand is replaced with Copper Slag, upto 100% (by volume) as fine aggregate in these AASC mixes. The behavior of plain concrete prisms, cast with this range of AASC mixes under dynamic cyclic loads with sand/CS fine aggregates is studied and is compared with conventional OPC-based concrete specimens. The results indicate that incorporation of CS even upto 100% as fine aggregates, did not have any adverse effects on the mechanical properties of AASC mixes. The AASC mixes with CS displayed slightly better fatigue performance as compared to AASC mix with river sand. An attempt is also made herein to statistically describe the fatigue life data of AASC mixes using a 2-parameter Weibull distribution.

Effect of recycled fine aggregates on alkali-activated slag concrete properties

Structures ◽  
2021 ◽  
Vol 30 ◽  
pp. 89-99
Author(s):  
Jinguang Huang ◽  
Chaoying Zou ◽  
Duo Sun ◽  
Bin Yang ◽  
Jiachuan Yan
Keyword(s):  
Alkali Activated Slag ◽  
Concrete Properties ◽  
Fine Aggregates ◽  
Activated Slag ◽  
Alkali Activated

scholarly journals Effect of Utalization of Natural Aggregates by Rap Aggregates And Cement By GGBS in Alkali Activated Concrete Pavement

2019 ◽  
Vol 8 (3) ◽  
pp. 3813-3819
Keyword(s):  
Concrete Pavement ◽  
Geopolymer Concrete ◽  
River Sand ◽  
Rigid Pavement ◽  
Complete Replacement ◽  
Coarse Aggregates ◽  
Fine Aggregates ◽  
Natural Aggregates ◽  
Alkali Activated Concrete ◽  
Alkali Activated

Coarse aggregates and cement are the main constituents of the concrete in the rigid pavement structure. The procurement and generation of natural aggregates are getting difficult day by day because of a lack of natural resources. Search for alternatives to natural coarse and fine aggregates leads to the usage of Reclaimed Asphalt Pavement aggregates, which are produced abundantly due to the replacement of flexible pavement with the rigid pavement. Ground Granulated Blast Furnace Slag (GGBS) is a waste material/by-product from steel and iron industries that can be used as an alternative binder in the alkali enacted system in place of cement. This study is taken up to determine the physical properties of materials, strength parameters and durability aspects of alkali-activated concrete are studied with GGBS which is the complete replacement for cement. The RAP aggregates are procured from KR market flyover Bangalore. And it is checked in the effective utilization in geopolymer concrete pavements. RAP fine aggregates and RAP coarse aggregates are partially replaced with river sand and natural aggregates with a variation of 100%, 75%, 50%, and 25% for M40 grade of concrete. Na2O dosage of 4.5% and activator modulus of 1.25 is taken and kept constant throughout the study. The cubes, cylinders and beams were casted and tested for strength. And fatigue test and non destructive test such as ultrasonic pulse velocity and rebound hammer test is conducted. The results can be analyzed to identify the importance of RAP fine aggregates and RAP coarse aggregates in the geopolymer concrete pavement for its effective usage for present scenario. Concluding all the test results the replacement of 25% RAP coarse aggregates and 50% RAP fine aggregates giving more strength than normal concrete which can be used for pavement construction

Study on the Shrinkage of a Full-Scale Wall Made with Blast Furnace Slag Fine Aggregates

CONCREEP 10 ◽  
2015 ◽  
Author(s):  
Tomiyuki Kaneko ◽  
Keiichi Imamoto ◽  
Chizuru Kiyohara ◽  
Akio Tanaka ◽  
Ayuko Ishikawa
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Full Scale ◽  
Fine Aggregates ◽  
Furnace Slag
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