scholarly journals A sustainable environmental study on clamshell powder, slag, bagasse ash, fly ash, and corn cob ash as alternative cementitious binder

2021 ◽  
Vol 841 (1) ◽  
pp. 012003
Author(s):  
N O Abdullah ◽  
Fakhruddin ◽  
R D W Bachtiar ◽  
N K Rusni
Keyword(s):  
Fly Ash ◽  
Environmental Study ◽  
Corn Cob ◽  
Cementitious Binder

Investigation on a New Hydraulic Cementitious Binder Made from Phosphogypsum

2013 ◽  
Vol 864-867 ◽  
pp. 1923-1928
Author(s):  
Yue Xu ◽  
Jian Xi Li ◽  
Li Li Kan
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Active Carbon ◽  
High Strength ◽  
Tricalcium Silicate ◽  
Dicalcium Silicate ◽  
Cementitious Material ◽  
Saturation Ratio ◽  
Tricalcium Aluminate ◽  
Cementitious Binder

A new kind of high strength cementitious material is made from phosphogypsum (PG), active carbon and fly-ash. Through the orthogonal research, it was showed that the calcination temperature, retention time, dosage of active carbon and fly ash on the compressive strength of cementitious binder are the most important. The result also showed that, in the conditions of temperature 1200°C, time retention 30 min, dosage of active carbon 10%, dosage of fly ash 5%, the compressive strength of the cementitious material for 3d and 28d could reach to 46.35MPa and 92.70MPa, the content of sulfur trioxide was 11.60% accordingly. A lot of active mineral materials, such as dicalcium silicate, tricalcium silicate, tricalcium aluminate were formed in the calcination. The C-S-H gel, calcium hydroxide and ettringite were found in 3d and 28d hydrates. It is found that the lime saturation ratio and silica modulus need to be control between 0.40~0.65 and 4~8 in order to produce high strength cementitious material.

Reactivity of coal fly ash used in cementitious binder systems: A state-of-the-art overview

Fuel ◽  
2021 ◽  
Vol 301 ◽  
pp. 121031
Author(s):  
Zhipeng Li ◽  
Gang Xu ◽  
Xianming Shi
Keyword(s):  
Fly Ash ◽  
State Of The Art ◽  
Coal Fly Ash ◽  
Cementitious Binder

scholarly journals A review on effects of ceramic tile waste as partial replacement of coarse aggregate on geopolymer paver block

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Sweda Sara Philip ◽  
C.P. Archana
Keyword(s):  
Fly Ash ◽  
Alkaline Solution ◽  
Ceramic Tile ◽  
Coarse Aggregate ◽  
Waste Material ◽  
Environmental Benefits ◽  
Engineering Industry ◽  
Partial Replacement ◽  
Ceramic Waste ◽  
Cementitious Binder

Paver blocks are used in many areas like street road and other construction places. Due to rapid infrastructure development the use of cement is increasing. Cement emits large amount of carbon dioxide (CO2) and this leads to global warming. Today researches on waste management lead to an eco-friendly product called geopolymer mortar and concrete. To support the development of pavement construction in the civil engineering industry, a new approach to predicting the performance of the geopolymer paver block (GPB) has been proposed. A huge quantity of ceramic waste is generated during processing, transportation and handling. To reduce this waste disposal, ceramic waste can be used as an alternative material to natural coarse aggregate. Fly ash and Ground Granulated Blast-furnace Slag (GGBS) are activated using alkaline solution such as sodium silicate and sodium hydroxide to get cementitious binder. There are various paper and research works based on natural coarse aggregate replaced by various percentages of other industrial waste material and cement replaced by various percentage of other waste material and it is found that there is increase in strength, durability and reduction in cost and utilization of waste material. Various waste material can be used for improving strength of paver block. The primary objective of this review is to understand the properties as well as economical and environmental benefits of GPB using ceramic tile waste corresponding to M40 grade (16M) based on earlier researches. From the mix designed, 25% Fly ash and 75% GGBS shows optimum mix. The review work also focus on selection of various percentages of ceramic tile waste for replacing natural coarse aggregate. Key Words:  Geopolymer Paver Block, Fly Ash, GGBS, Cementitious binder, Alkaline solution, Ceramic tile waste

Influence of Sodium Hydroxide Grade on the Strength of Fly Ash-Based Geopolymer Cement

2020 ◽  
Vol 998 ◽  
pp. 317-322
Author(s):  
Teewara Suwan ◽  
Boontarika Paphawasit ◽  
Peerapong Jitsangiam ◽  
Prinya Chindaprasirt
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Construction Material ◽  
Laboratory Scale ◽  
Unit Price ◽  
Alkaline Solutions ◽  
Green Construction ◽  
Industrial Grade ◽  
Cementitious Binder ◽  
Geopolymer Cement

Portland cement (OPC) is one of the primary contributors accounted for climate change as a massive amount of Carbon dioxide is emitted to the atmosphere during its production processes. Geopolymer cement (GP), a green construction material, is therefore promoted to be an alternative cementitious binder to replace the consumption of that OPC. GP can be synthesized by mixing pozzolanic wastes (e.g., fly ash or slag) with alkaline solutions (e.g., NaOH and Na2SiO3). The mechanical properties of the geopolymer have been confirmed to be similar to or even better than OPC in the same testing conditions. However, the researches on GP have been mostly carrying out in just a laboratory scale, thus, the Laboratory grade of alkaline activators was commonly used. To make GP more realistic in practical works, the Industrial grade of alkaline activators was hence introduced. The results show that the usage of Industrial grade activators not only provides excellent mechanical properties to GP but also reduces its unit price to less than 20 percent of the conventional GP (GP with Laboratory-grade activator). By this approach, the confidence of expanding this green construction material, from Laboratory scale to In-field applications, is considerably increased.

Effect of Active Magnesia on the Properties of Cementitious Binders

2012 ◽  
Vol 1488 ◽  
Author(s):  
Jing Zhu ◽  
Nan Ye ◽  
Jianwen Liu ◽  
Yalin Li ◽  
Jiakuan Yang
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Sem Analysis ◽  
Rapid Expansion ◽  
X Ray Diffraction ◽  
Initial Stage ◽  
Cementitious Binder ◽  
Negative Effect ◽  
The Dead

ABSTRACTReactive magnesium oxide (magnesia, MgO) was produced by calcining magnesite at comparatively low temperature, less than 800 ℃C. The reactive MgO and fly ash were used as additives to cementitious binder. The reactive MgO-ordinary Portland cement-fly ash is referred to as MgO-OPC-FA cement in further. The hydration expansion effect of active magnesia on the properties of cementitious binder in different mixing ratio was investigated. It is known that the “dead burnt” MgO reacts with water very slowly, which causes the expansion after the solidification of cement. Therefore, the MgO content in ordinary cement is commonly restricted to less than 5%. Effects of reactive MgO on the expansion properties of the cementitious binders were studied. Hydrated products of reactive MgO cements were investigated by X-ray diffraction (XRD) and Scanning electron microscope (SEM) analysis. The MgO-OPC-FA cement was sound, although the content of reactive MgO in cement was about 8 wt. %. Reactive MgO was hydrated at early age in 24 hours, thus causing rapid expansion. Mg(OH)2appeared on initial stage of cement hydration for active magnesia. The hydration rate of active magnesia was not equal to that of the dead burnt magnesia. The hydration of reactive MgO has a negative effect on the mechanical properties of reactive MgO-ordinary Portland cement-fly ash system, in spite of the inhibitive effect of the expansion of MgO hydration produced by fly ash. Our results shed light on the potential utilization of reactive MgO in the manufacturing of cementitious binders.

scholarly journals A Sustainable Environmental Study on Corn Cob Ash Subjected To Elevated Temperature

2018 ◽  
Vol 13 (1) ◽  
pp. 144-150 ◽  
Author(s):  
Komalpreet Singh ◽  
Jaspal Singh ◽  
Sarvesh Kumar
Keyword(s):  
Compressive Strength ◽  
High Temperature ◽  
Elevated Temperature ◽  
Room Temperature ◽  
Carbon Dioxide Emission ◽  
Environmental Study ◽  
Air Cooling ◽  
Corn Cob ◽  
Muffle Furnace ◽  
Compressive Strength Of Concrete

Rapid increase in greenhouse gas induces mischievous impact on environment. In this study, carbon dioxide emission can be reduced to some extent by replacing some amount of cement with corn cob ash. The performance of concrete at high temperature was also studied. This paper investigates the effect of elevated temperature on strength property of ordinary concretes of grade M25, containing Corn Cob Ash (CCA) at various replacement levels of cement. The cube samples were subjected to high temperature of 1500C, 3000C, 4500C and 6000C for 2 hour duration in a muffle furnace. The samples were tested for compressive strength after air cooling to the room temperature. It can be seen that at normal temperature, compressive strength of the concrete decreases as the CCA content increases. The compressive strength of concrete increased significantly for all the mixes including control mix when the temperature was raised to 3000C. The recommended maximum replacement content of cement with CCA and elevated temperature was 10% and 3000C respectively.

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