scholarly journals PULVERIZED FUEL ASH SOLIDIFICATION/STABILIZATION OF WASTE: COMPARISON BETWEEN BENEFICIAL REUSE OF CONTAMINATED MARINE MUD AND SEDIMENT

2015 ◽  
Vol 23 (3) ◽  
pp. 202-210 ◽  
Author(s):  
Ivan Y. TANG ◽  
Dickson Y. S. YAN ◽  
Irene M. C. LO ◽  
Tongzhou LIU
Keyword(s):  
Mechanical Property ◽  
Engineering Application ◽  
Strength Development ◽  
Safe Level ◽  
Beneficial Reuse ◽  
Fuel Ash ◽  
Pulverized Fuel ◽  
Optimal Mix ◽  
Pulverized Fuel Ash ◽  
Marine Mud

This study aimed to maximize the utilization of contaminated marine mud and sediment for beneficial reuse by solidification/stabilization (S/S) treatment with cement and pulverized fuel ash (PFA). For the purposes of waste maximization and enhancing the mechanical property of the S/S mixtures, mixing 75% by mass of either contaminated marine mud or sediment with 20% and 5% of cement and PFA, respectively, was found to be the optimal mix design. Their unconfined compressive strengths reached up to 8.32 MPa and 4.47 MPa, respectively. Apart from the mechanical property, according to the U.S.EPA, the TCLP results show that all regulated heavy metals were immobilized to a safe level and are available for engineering application such as fill material. The results of XRD reveal that the formation of CSH gel in the S/S treated mud and sediment is responsible for the strength development and heavy metal immobilization.

scholarly journals Effect of PFA on Strength and Water Absorption of Mortar

2011 ◽  
Vol 2 (1) ◽  
pp. 7-11
Author(s):  
Gingos G.S. ◽  
Mohamed Sutan N.
Keyword(s):  
Water Absorption ◽  
Absorption Rate ◽  
Mineral Admixtures ◽  
Partial Replacement ◽  
Strength Development ◽  
Laboratory Studies ◽  
Fuel Ash ◽  
Pulverized Fuel ◽  
Pulverized Fuel Ash ◽  
Reduced Rate

Partial replacement of cement by mineral admixtures or pozzolans can possibly improve the durability of mortar which directly related to its water absorption. Pulverized Fuel Ash (PFA) is one of the pozzolans that is locally available. Laboratory studies have been conducted on mortar mixes of 0.3w/c, 0.4w/c and 0.5w/c ratios with 10%, 20% and 30% PFA replacements. Mortar cubes were tested to determine their water absorption rates and compressive strengths as they mature. Amount of PFA replacements in the mortar has significant effects on the strength development and water absorption rate of the mortar. Results shows that 20% PFA mortars of 0.5w/c ratio is the best mix to reduced rate of water absorption and achieved higher compressive strength.

Pfa For Concrete: Mix Proportioning And Strength Development

1987 ◽  
pp. 1-13
Author(s):  
Prof. Madya Dr. Mohd. Warid Hussin
Keyword(s):  
Strength Development ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Mix Proportioning ◽  
Wide Range ◽  
Fuel Ash ◽  
Direct Replacement ◽  
Pulverized Fuel ◽  
Pulverized Fuel Ash

This paper describes an investigation on mix design of concrete incorporation highly percentage of pulverized fuel ash (pfa} as a cement replacement in concrete. Studies are also made on the strength development of OPC/superplasticised pfa concrete designed for a specified workability and 28 days strength equivalent to that of the corresponding OPC concrete capering a very wide range of pfa usage (from 30% to 70%), water: cement ratio and age at test. Mixes designed by partial but direct replacement of 70% of pfa and water, cement ratio of 0.3 and a superplasticizer dosage of 2% by weight of cement + pfa, shows a slightly lower strength compared to OPC at earlier age but the concrete achieves comparable strength to OPC concrete at later ages. Such a concrete also exhibits highly workable properties with no detrimental effects on the quality of the concrete. Keywords: admixtures, compressive strength, flexural strength, fly ash, workability, proportioning, water-cement ratio, superplasticizer

Lightweight Mortar Incorporating Various Percentages of Waste Materials

2014 ◽  
Vol 67 (3) ◽  
Author(s):  
Taha Mehmannavaz ◽  
Mohammad Ismail ◽  
Salihuddin Radin Sumadi ◽  
Mostafa Samadi ◽  
Seyed Mahdi Sajjadi
Keyword(s):  
Strength Development ◽  
Palm Oil Fuel Ash ◽  
Cement Replacement ◽  
Fuel Ash ◽  
Pulverized Fuel ◽  
Aerated Concrete ◽  
Pulverized Fuel Ash ◽  
Partial Cement Replacement ◽  
Oil Fuel ◽  
Curing Regime

The experimental study evaluated the performance of lightweight aerated concrete incorporating various percentages of palm oil fuel ash (POFA) and pulverized fuel ash (PFA) as partial cement replacement. Performance evaluation of the aerated concrete was investigated with respect to ultimate compressive strength, density and strength development. Twelve mixes are developed and tested at different periods, i.e. 3, 7and 28 days. In this work, two different curing regime namely air curing and water curing were used to monitor the effect of the curing regime. The results show that the mixtures produced by replacing cement with POFA and PFA were comparable to the mix without cement replacement. Furthermore, this investigation observed that the cement-POFA-PFA based lightweight aerated concrete can be produced as lightweight non-load bearing concrete units, because hazard of ashes (POFA & PFA) might be a serious issue for human health. Disposal of ashes contributes the shortage of landfill space in all the worlds, especially in Malaysia.  

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