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.

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 Evaluation of Cassava Effluent as Organic Admixture in Concrete Production for Farm Structures

2020 ◽  
pp. 271-282
Author(s):  
Ovie Isaac AKPOKODJE ◽  
Goodnews Goodman AGBI ◽  
Hilary UGURU
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
Fresh Water ◽  
Absorption Rate ◽  
International Standards ◽  
Partial Replacement ◽  
Strength Development ◽  
Water Absorption Rate ◽  
Concrete Production ◽  
Farm Structures

This paper evaluated the influence of cassava effluent on the compressive strength of concrete for farm structures. Three sets of concrete cubes were produced with a concrete mix ratio of 1:2:4 (C 15) and a water to cement ratio (w c-1) of 0.5. The 1st set was produced with 100% fresh water (tap water). The 2nd set was produced with 75% partial replacement of the fresh water with fresh cassava effluent, while the 3rd set was produced with 75% partial replacement of the fresh water with old cassava effluent. The density, water absorption rate and compressive strength of the concrete cubes was tested in accordance with ASTM International standards, at the end of 7, 14, 21, 28 and 56 curing days. The results revealed that, the cassava effluent slightly increased the cubes density; but reduced their water absorption rate. The study further showed that, concrete produced with fresh cassava effluent, developed the highest compressive strength (29.57 MPa) at the end of the 56th curing day. In contrast, concrete produced with old cassava effluent developed the lowest compressive strength (24.43 MPa) at day 56, which was lower than the compressive strength of 27.18 MPa developed by the concrete produced with fresh water (also at day 56). In addition, the cassava effluent retarded the initial rate of strength development, as such, increasing its prospect as an organic concrete admixture. This study will be helpful in mitigating the harmful effects of cassava effluent in the environment, since it can be utilized in concrete production.

Factors affecting the frost susceptibility characteristics of pulverized fuel ash

1970 ◽  
Vol 7 (1) ◽  
pp. 69-78 ◽  
Author(s):  
H. B. Sutherland ◽  
P. N. Gaskin
Keyword(s):  
Tensile Strength ◽  
Ordinary Portland Cement ◽  
Hydrated Lime ◽  
Frost Heave ◽  
Relative Importance ◽  
Laboratory Studies ◽  
Factors Affecting ◽  
Fuel Ash ◽  
Pulverized Fuel ◽  
Pulverized Fuel Ash

The results of laboratory studies of the frost susceptibility characteristics of pulverized fuel ash are presented. Four different ashes were investigated, in their plain state, and also after stabilization with ordinary Portland cement and calcitic hydrated lime. Measurements were made of frost heave, permeability, compressive and tensile strength, and heaving pressure. Frost heave was shown to decrease as the strength increased and as the permeability decreased. Values of strength and permeability were found at which the frost heave was reduced to an acceptable value, and the relative importance of strength and permeability in reducing frost heave is discussed. The heaving pressures mobilized are compared with the corresponding compressive and tensile strengths of the ashes.

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.  

An experimental study on cyclic behaviour of reinforced concrete connections using waste materials as cement partial replacement

2019 ◽  
Vol 46 (6) ◽  
pp. 522-533
Author(s):  
Yasmin Murad ◽  
Yousef Abu-Haniyi ◽  
Ala AlKaraki ◽  
Zeid Hamadeh
Keyword(s):  
Silica Fume ◽  
Waste Materials ◽  
Partial Replacement ◽  
Cyclic Tests ◽  
Concrete Compressive Strength ◽  
Cyclic Behaviour ◽  
Fuel Ash ◽  
Pulverized Fuel ◽  
Concrete Materials ◽  
Pulverized Fuel Ash

A series of cyclic tests on unconfined beam–column connections with composite concrete materials are conducted. Cement is partially replaced by waste materials using two different percentages of 15% and 20%. The proper percentage of cement replacement is found to be 15% for the pulverized fuel ash, silica fume, and iron filings. Increasing the percentage to 20% tends to relatively decrease concrete compressive strength, weaken the joint, and reduce its ductility. It is recommended using pulverized fuel ash to enhance the performance of beam–column connections under cyclic loading. Silica fume and iron filings have also enhanced the joint response, but the enhancement is most remarkable when using 15% pulverized fuel ash. The implementation of composite concrete has increased the joint’s ductility and reduced its level of damage based on the type and percentage of the implemented waste material. Furthermore, the disposal of waste materials into the concrete mix is a good solution for reducing environmental pollution.

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