Properties of natural pozzolan and its potential utilization in environmental friendly concrete

2011 ◽  
Vol 38 (1) ◽  
pp. 71-78 ◽  
Author(s):  
M.I. Khan ◽  
A.M. Alhozaimy
Keyword(s):  
Physical Properties ◽  
Plain Concrete ◽  
Environmental Benefits ◽  
Strength Development ◽  
Natural Pozzolan ◽  
Chloride Permeability ◽  
Cement Replacement ◽  
Pozzolanic Material ◽  
Environmental Friendly ◽  
Partial Cement Replacement

In Saudi Arabia, locally available natural pozzolanic material has the potential for use in environmental friendly concrete as a partial cement replacement. Local natural pozzolan was incorporated in concrete as a partial cement replacement to study the effect of replacement level, natural pozzolan fineness and its source. Chemical and physical properties of local natural pozzolan, properties of fresh concrete, compressive strength development, chloride permeability, and porosity of concrete incorporating local natural pozzolanic material as a partial cement replacement is presented. The influence of curing on the properties of concrete containing natural pozzolan and the X-ray diffraction analysis are reported. It was observed that regardless of its different sources, chemical and physical properties of local natural pozzolan are similar and conforms to the requirements of ASTM C 618, Class N. Concrete containing up to 15% natural pozzolan matches with the mix containing 20% fly ash, which is very close to the plain concrete. Higher dosages of this natural pozzolan can be utilized for economical and environmental benefits. This research is the first of its kind that addresses the investigation on Saudi natural pozzolanic material.

Durability of High Performance Concrete in an Aggressive Environment

2014 ◽  
Vol 600 ◽  
pp. 485-494
Author(s):  
Ahcene Merida ◽  
Fattoum Kharchi ◽  
Rabah Chaid
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Research Work ◽  
Strength Development ◽  
Natural Pozzolan ◽  
Chloride Permeability ◽  
Volcanic Origin ◽  
Physico Chemical ◽  
Compressive Strength Development ◽  
Partial Cement Replacement

In Algeria, locally available natural pozzolan of volcanic origin material has the potential for use in environmental friendly concrete as a partial cement replacement. This paper studies the effect of replacement level of pozzolan concrete in sulphated environment. The natural pozzolan has a marked influence on the properties of the concrete. When it is coupled to a water reducing superplasticizer by a correct adjustment of the composition, it greatly improves the concrete properties. The analysis of experimental results on pozzolan concrete at 5% content and fineness of 9565 cm2/g exposed in sulphated environment, show that it positively contributes to the improvement of its mechanical, physical and physico-chemical characteristics. Trough this research work, parameters such as compressive strength development, chloride permeability, water absorption and sulphates resistance are studied.

scholarly journals Acoustic Properties of Lightweight Foamed Concrete with Eggshell Waste as Partial Cement Replacement Material

2021 ◽  
Vol 50 (2) ◽  
pp. 537-547
Author(s):  
Siong Kang Lim ◽  
Kar Poh Foo ◽  
Foo Wei Lee ◽  
Hock Yong Tiong ◽  
Yee Ling Lee ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Industrial Revolution ◽  
Acoustic Properties ◽  
Sound Insulation ◽  
Strength Development ◽  
Cement Replacement ◽  
Foamed Concrete ◽  
Partial Cement Replacement ◽  
Strength Result ◽  
Eggshell Waste

Nowadays, almost every industry needs to undergo green and sustainable industrial revolution due to pollutions like waste dumping and noise that deteriorating the environment. Therefore, feasibility study on application of eggshell waste as partial cement replacement in lightweight foamed concrete was conducted by aiming to solve environmental and acoustical issues, i.e. reduce eggshell waste and improve acoustic properties. In this study, compressive strength and acoustic properties of 1300 kg m-3 lightweight foamed concrete with and without 5% eggshell powder as partial cement replacement material were tested. Optimal water to cement ratio of 0.6 was obtained for acoustic properties test by comparing compressive strength result. The result shows that application eggshell powder has generally reduced 7 days compressive strength but improved 28 days compressive strength, and either improve or maintain acoustics properties, in which lightweight foamed concrete that containing eggshell powder has improved noise reduction coefficient at testing ages of 7, 28, and 90 days and improved sound transmission class at testing age of 56 and 90 days. Based on these results, 5% of eggshell powder is feasible to be incorporated into lightweight foamed concrete as partial cement replacement material for sound insulation and strength development purposes.

Effect of Porosity on Mechanical and Hygric Properties of Concrete with Natural Pozzolan Addition

2014 ◽  
Vol 982 ◽  
pp. 22-26 ◽  
Author(s):  
Tereza Kulovaná ◽  
Pavla Rovnaníková ◽  
Zbyšek Pavlík ◽  
Robert Černý
Keyword(s):  
Compressive Strength ◽  
Portland Cement ◽  
Moisture Transport ◽  
High Performance ◽  
High Performance Concrete ◽  
Moisture Diffusivity ◽  
Natural Pozzolan ◽  
Cement Replacement ◽  
Hygric Properties ◽  
Partial Cement Replacement

Effect of porosity on mechanical and hygric properties of high performance concrete (HPC) with natural pozzolan as partial Portland cement replacement up to 40% is studied in the paper. The reference HPC mixture is researched as well in order to evaluate the influence of pozzolan usage on concrete performance. For the studied materials, measurement of compressive strength, sorptivity, apparent moisture diffusivity, and water vapor diffusion permeability is done. The obtained data shows that application of the pozzolan as partial cement replacement leads to increase of concrete porosity that is related to the lower mechanical strength and higher moisture transport properties. Therefore, the applied natural pozzolan has a potential to replace a part of Portland cement in concrete manufacturing but its content in concrete mixture has strict limitations.

Effects of sulphate salts on concrete with untreated coal fly ash (CFA) as partial cement replacement

2016 ◽  
Vol 34 (2) ◽  
pp. 117-134
Author(s):  
Kumaran Coopamootoo ◽  
Reshma Rughooputh
Keyword(s):  
Coal Fly Ash ◽  
Chemical Properties ◽  
Sodium Sulphate ◽  
Strength Development ◽  
Type I ◽  
Content Type ◽  
Cement Replacement ◽  
Partial Cement Replacement ◽  
Coal Composition ◽  
Chloride Environment

Purpose – The cementitious/chemical properties of the untreated CFA are dependent on the coal composition and previous burning conditions. The purpose of this paper is to investigate whether untreated CFA can efficiently reduce cement replacement and does not require further combustion treatment to be a viable cement replacement. Design/methodology/approach – Two types of mixes: Type I concrete and PCFA (Type I and 30 per cent untreated CFA) concrete were batched and subjected to compressive strength tests and cyclic exposures of 5 per cent sodium sulphate (Na2SO4) and 5 per cent magnesium sulphate (MgSO4), respectively. Findings – PCFA mix was 41.1 and 35.21 per cent lower in strength compared to Type I at 28 and 56 days correspondingly. Continuous-sulphate-exposure resulted in slow but continued strength development for both mixes. However, the strengths of PCFA cubes exposed to cyclic sulphate and sulphate/magnesium salts continued to increase at a lower rate from their corresponding 28-day strength (rate of 18.7 per cent and strength 27.30 MPa in Na2SO4 and rate of 10.0 per cent and strength 25.30 MPa in MgSO4) while Type I specimens subjected to the same exposure conditions experienced drastic reductions in strength (rate of −15.0 per cent and strength 33.21 MPa in Na2SO4 and rate of −23.4 per cent and strength 29.94 MPa in MgSO4). Research limitations/implications – Results justify the need for additional tests essentially: at different percentage replacement of untreated CFA, fineness of materials, chloride environment and longer exposures, to address the cementitious properties of untreated CFA as cement replacement. Originality/value – Treatment methods for fly ashes require undoubtedly additional resources, energy input and cost. This paper paves the way to define whether untreated CFA can be used as cement replacement in concrete.

Properties of Concrete with Different Percentange of the Rice Husk Ash (RHA) as Partial Cement Replacement

2014 ◽  
Vol 803 ◽  
pp. 288-293 ◽  
Author(s):  
Mustaqqim Abdul Rahim ◽  
Norlia Mohamad Ibrahim ◽  
Zulliza Idris ◽  
Zuhayr Md Ghazaly ◽  
Shahiron Shahidan ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Waste Product ◽  
Economic Problem ◽  
Cement Replacement ◽  
Pozzolanic Material ◽  
Chemical Content ◽  
Partial Cement Replacement ◽  
Pozzolanic Properties

The use of pozzolanic material from waste product as partial cement replacement in concrete contribute to reduce the environmental, economic problem through their waste and as well enhance the strength and properties of concrete. Rice husk ash (RHA) is one of the industrial waste that suitably used as a cement replacement due to its pozzolanic properties which can enhance the properties of concrete. In this study, the workability, compressive strength and water absorption of the concrete containg RHA is investigating. The chemical content of RHA also investigated by using X-ray Fluorescence Test (XRF). The different RHA percentage of 5%, 15% and 25% were used in this study with burning temperature 650°C. The concrete cube of size 100 mm x 100 mm x 100 mm were prepared and cured for 7, 14 and 28 days. Based on result, it was concluded that the optimum RHA replacement for cement in this report was 5 %, which provided the highest compressive strength at 28 days.

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.  

scholarly journals Production of more durable and sustainable concretes using volcanic scoria as cement replacement

2017 ◽  
Vol 67 (326) ◽  
pp. 118 ◽  
Author(s):  
A. M. Al-Swaidani
Keyword(s):  
Tensile Strength ◽  
Water Permeability ◽  
Cement Mortar ◽  
Plain Concrete ◽  
Strength Development ◽  
Blended Cements ◽  
Edx Analysis ◽  
Cement Replacement ◽  
Estimation Equations ◽  
Strength And Durability

The objective of the study is to investigate strength and durability-related properties of volcanic scoria-based cements. Compressive and tensile strength development of mortars and concretes containing volcanic scoria with replacement levels ranging from 10 to 35% was investigated. Water permeability, chloride penetrability and porosity of concretes cured for 2, 7, 28, 90 and 180 days were also examined. Results revealed that volcanic scoria could be suitable for making blended cements. The strength of mortar/concrete containing volcanic scoria was lower than that of plain cement mortar/concrete at all ages. However, at 90 day curing, the strengths of volcanic scoria-based mortars/concretes were comparable to those of plain cement. In addition, water permeability, chloride penetrability and porosity of scoria-based concretes were much lower than those of plain concrete. Further, the results were statistically analysed and estimation equations have been developed to predict the studied properties. SEM/EDX analysis was employed, as well.

Effect of ground granulated blast funrnace slag and fly ash on strength, permeability, and under-water abrasion of fine-grained concrete

2020 ◽  
Vol 71 (7) ◽  
pp. 775-788
Author(s):  
Quyet Truong Van ◽  
Sang Nguyen Thanh
Keyword(s):  
Fly Ash ◽  
Concrete Strength ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Chloride Permeability ◽  
Cement Replacement ◽  
Fine Grained ◽  
Granulated Blast Furnace Slag ◽  
Compressive Strength Test ◽  
Economic Ground

The utilisation of supplementary cementitious materials (SCMs) is widespread in the concrete industry because of the performance benefits and economic. Ground granulated blast furnace slag (GGBFS) and fly ash (FA) have been used as the SCMs in concrete for reducing the weight of cement and improving durability properties. In this study, GGBFS at different cement replacement ratios of 0%, 20%, 40% and 60% by weight were used in fine-grained concrete. The ternary binders containing GGBFS and FA at cement replacement ratio of 60% by weight have also evaluated. Flexural and compressive strength test, rapid chloride permeability test and under-water abrasion test were performed. Experimental results show that the increase in concrete strength with GGBFS contents from 20% to 40% but at a higher period of maturity (56 days and more). The chloride permeability the under-water abrasion reduced with the increasing cement replacement by GGBFS or a combination of GGBFS and FA

Review paper: Performance of rice husk ash as a material for partial cement replacement in concrete

2021 ◽  
Author(s):  
Zaidatul Syahida Adnan ◽  
Nur Farhayu Ariffin ◽  
Sharifah Maszura Syed Mohsin ◽  
Nor Hasanah Abdul Shukor Lim
Keyword(s):  
Rice Husk ◽  
Review Paper ◽  
Rice Husk Ash ◽  
Cement Replacement ◽  
Partial Cement Replacement
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