Saturday, 18/11/2017 | 12:10 UTC+8

Concrete guidelines for developers – Sewage Treatment Plants in Malaysia

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If follow Sewage Services Department (JPP) / National Sewerage Company (IWK) guidelines there’s still a need to line the Sewage Treatment Plants tanks with High Alumina Cement.

There is a ‘Guidelines for developers – Sewage Treatment Plants’, in the manual which states that:-

  • Concrete structures shall be designed in accordance with MS 1195, except that concrete structures for retaining sewage and other aqueous liquids shall be designed in accordance with BS 8007.

(BS 8007 stipulates the use of ground granulated blastfurnace slag (ggbs) up to 50% and/or fly ash up to 35%. In practice, a 50% ggbs and 25% fly ash cement blends are used for the concrete structures)

Further down the Section, there’s a requirement of high alumina cement lining:-

  • Concrete structures retaining sewage, but not unit process structures, shall be lined with high alumina cement mortar of 20mm minimum thickness.

The guidelines also stipulates the use of sulphate resisting portland cement or one of the blended cement:-

  • Cement to be used to resist sulphate attack shall be sulphate resisting portland cement complying with MS 1037. Where not available, one of the following cements shall be used to resist sulphate attack:

Portland pulverized fuel ash cement complying with MS 1227

Ground granulated blastfurnance slag complying with MS 1387

(However, MS 1227 now obsolete and replaced by MS EN 197-1:2007 while MS 1387 replaced by MS EN 15167-1:2010 . Furthermore, sulphate resisting portland cement are slowly being phased out with limited production as it can be replaced by either ggbs or fly ash cements)

Hence, in current practice and using the above as guideline, for concrete structures in contact with sewage (tanks, manholes, pipes etc), the proper cement specifications based on MS EN 197-1 would be:-

  • Cement to be used to resist sulphate attack shall be one of the following cement based on MS EN 197-1:

Portland Fly Ash Cement complying with CEM II/B-V with minimum 25% fly-ash content

Blastfurnace Cement complying with CEM III/A with minimum 50% ggbs content.

  • Concrete structures retaining sewage, but not unit process structures, shall be lined with high alumina cement mortar of 20mm minimum thickness.

Related Topic: Blastfurnace Cement as an alternative to Sulphate Resisting Portland Cement (SRPC)

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