Formulation and optimization of a phosphogypsum – fly ash – lime composite for road construction: A statistical mixture design approach

2022 ◽  
Vol 315 ◽  
pp. 125786
Author(s):  
Sarra Meskini ◽  
Toufik Remmal ◽  
Houssine Ejjaouani ◽  
Azzedine Samdi
2015 ◽  
Vol 55 ◽  
pp. 17-25 ◽  
Author(s):  
Ehsan Ghafari ◽  
Hugo Costa ◽  
Eduardo Júlio

2017 ◽  
Vol 39 (7) ◽  
pp. 934-942 ◽  
Author(s):  
Kok Whye Cheong ◽  
Hamed Mirhosseini ◽  
Bahareh Tabatabaee Amid ◽  
Nazimah Sheikh Abdul Hamid ◽  
Chin Ping Tan

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Sarath Chandra K ◽  
Krishnaiah S ◽  
Kibebe Sahile

Industrialization is the key to the growth of any country’s economy. However, on the other hand, the production of industrial waste is increasing enormously, which adversely impacts the environment and natural resources. Red mud is also a widespread industrial waste produced during aluminium extraction from bauxite ore in Bayer’s process. Red mud is a highly alkaline material that creates a massive environmental threat in nature. To reduce the impact of this solid waste material, the ideal method is to use it in construction works with appropriate stabilization. This study envisages the strength properties of red mud with fly ash and cement to use it as a road construction material in the subgrade. The influence of fly ash and cement on improving the strength properties of red mud was studied in detail by replacing red mud with 10%, 20%, and 30% with fly ash and 1%, 3%, and 5% of cement to its dry weight. The CBR (California bearing ratio) value was increased from 1.58% to 11.6% by stabilizing red mud with fly ash and cement, which can be used as a road construction material. The UCS (unconfined compressive strength) of red mud was increased from 825 kPa to 2340 kPa upon curing for 28 days with the right mix of fly ash and cement. Along with the strength properties, the chemical analysis of leachate for the best suitable mix was performed according to the TCLP method to understand the hazardous materials present in the red mud when it is injected as ground material. Both strength properties and the leachate characteristics prove that the red mud with suitable fly ash and cement is an excellent material in road constructions.


Rolled compacted concrete (RCC) is important of newly technique in construction of pavement. that can be employed in low traffic or high trafficked roads. Due to its inexpensive, quick creation , durable and low maintenance RCC is becoming more commonly gradually . If the UHPC compared to normal concrete has some privilege such as plenty stability and supreme permanence however the utilization of it is restricted owing to its expensiveness and minimal cods for design.. Its constancy leads to its stay persistent when subjected to vibratory compacter, since it has sufficient wetting so it causes permit enough mixing and repartition of paste without segregation. Fly ash, silica fume and some admixture can be utilized to concrete to decrease the quantity of water cand generate high arid mixture.


2021 ◽  
Vol 25 (11) ◽  
pp. 36-41
Author(s):  
D.V. Bespolitov ◽  
N.A. Konovalova ◽  
O.N. Dabizha ◽  
P.P. Pankov ◽  
E.A. Rush

The possibility of utilization of inactive fly ash in road concrete compositions by bringing of ash into a non-equilibrium condition with increased reactivity by mechanical activation in a vibration eraser is investigated. It was revealed that the optimal content of binder and fly ash in samples of soil concrete was 8 and 10 wt. %, respectively. It is shown that, due to mechanical activation, the specific surface area of fly ash increases by 2 times, dehydration and carbonization occur and silicon is replaced by aluminum in silicon-oxygen tetrahedra. It has been established that an increase of the content of crystalline carbonate phases is the reason for an increase in the strength of ground concrete. It is determined that the introduction of mechanoactivated fly ash into the composition of soil concretes contributes to increasing their physical and mechanical characteristics to the maximum strength grade M100. This indicates the competitiveness of ground concrete and the possibility of direct use of inactive fly ash in road construction.


2021 ◽  
Vol 88 ◽  
pp. 108520 ◽  
Author(s):  
Hamza Mechchate ◽  
Imane Es-safi ◽  
Hassan Haddad ◽  
Hicham Bekkari ◽  
Andriy Grafov ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document