Water permeability of recycled aggregate concrete containing new pozzolan micronised biomass silica material

Abdul Rahman, Ismail and Adnan, Suraya Hani and Soejoso, Mia Wimala and Ahmad Zaidi, Ahmad Mujahid (2011) Water permeability of recycled aggregate concrete containing new pozzolan micronised biomass silica material. Project Report. Universiti Tun Hussein Onn Malaysia. (Unpublished)

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Abstract

Natural Aggregate (NA) is an essential ingredient for producing concrete. However, NA is a depleting resource and the quarrying and mining process are not environmentalfriendly. Thus, Recycled Aggregate @A) is introduced as an alternative material to replace NA Such an approach has been widely accepted in developed countries like United Kingdom, United States, Netherland, Denmark and Hong Kong. Nevertheless, concrete containing RA or known as Recycled Aggregate Concrete (RAC) has certain weakness in terms of permeability. This study is conducted in depth to explore ways to overcome these problems. Micronised Biomass Silica (MBS) has been recognised as a material with a good potential for such application. MBS is derived from controlled incineration of rice husk which is amorphous and with silicon dioxide (SiOz) content for about 87.67%. The reduction of MBS particle size to 25.77 pin was by means of jar mill. The grade of 25 MPa concrete was produced with cement content 450 kg/m3 and w/c 0.5. MBS are used as cement replacement material for up to 12% by weight and RA was used for up to 100%. Comparative study was conducted with three different conditions namely; concrete with RA, concrete with MBS and MBS-RA concrete was carried out. It was found that the incorporation of 12% MBS and 100% RA has produced concrete with water permeability coefficient 7.94 x 10'12 d s and water penetration depth 64.5 rnm for 28 days age of concrete and its compressive strength is 35.40 MPa. Furthermore, Scanning Electron Microscopy (SEM) was used to examine the microstructure of RAC and Natural Aggregate Concrete (NAC). It was observed that the quality of RAC significantly influences by ITZ. Regression analysis was also conducted to establish the relationship among different parameters (compressive strength, water permeability coefficient and water penetration) for RAC, NAC, MBS concrete and MBS-RA concrete. It was discovered that compressive strength has strong relationship with water permeability coefficient and water penetration. Two equations were proposed for predicting the compressive strength and water penetration for RAC and MBS-RA concrete. For proposing these equations, SPSS 14 was used. A nomograph chart as a guideline to designing RAC (with or without MBS) was also developed as the outcome of this study. This chart named as Nomograph Chart MBS-RA Concrete which comprises four axes represent cement content, compressive strength at 28 days or 365 days, percentage of RA and water penetration. Nomograph Chart MB S-RA Concrete is proposed to be used for designing MBS-RA concrete at 28 and up to 365 days.

Item Type:Monograph (Project Report)
Subjects:T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
ID Code:1778
Deposited By:Normajihan Abd. Rahman
Deposited On:28 Sep 2011 13:21
Last Modified:28 Sep 2011 13:21

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