Thursday, 21/9/2017 | 3:54 UTC+8
  • Concrete guidelines for developers – Sewage Treatment Plants in Malaysia

    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

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  • Corrosion
    Why is Sulphate-Resisting Cement not used in Marine Concrete?

    The main components of Portland Cement are tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite. In Sulphate-Resisting Cement, it contains a low amount of tricalcium aluminate in order to avoid sulphate attack. Otherwise, tricalcium aluminate would react with sulphates to form calcium sulphoaluminate and gypsum that cause expansion and crack the concrete structure. However,

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  • Standard strength of a cement

    The standard strength of a cement is the compressive strength determined in accordance with EN 196-1 at 28 days and shall conform to the requirements in table below. Three classes of standard strength are included: class 32,5, class 42,5 and class 52,5 The strength classes are determined based on controlled testing with standard sand to

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  • Alkali-Silica Reaction (ASR) in concrete

    Alkali-silica reaction (ASR) can cause serious expansion and cracking in concrete, resulting in major structural problems and sometimes necessitating demolition. Cause of alkali-silica reaction ASR is the most common form of alkali-aggregate reaction (AAR) in concrete; the other, much less common, form is alkali-carbonate reaction (ACR). ASR and ACR are therefore both subsets of AAR.

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  • Lime
    Limestone Powder in Malaysia

    Introduction Limestone is a sedimentary rock, formed by inorganic remains, such as shells or skeletons, that have compressed for a very long time. The main element found in limestone is calcium carbonate but it may contain magnesium, iron or manganese as well, which affect the whiteness and hardness. In Peninsular Malaysia, limestone major occurrences are

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  • An on site simple test for determining workability is the SLUMP TEST.
    How to improve and factors affecting Workability of Concrete

    Workability is one of the physical parameters of concrete which affects the strength and durability as well as the cost of labor and appearance of the finished product. Concrete is said to be workable when it is easily placed and compacted homogeneously i.e without bleeding or Segregation. Unworkable concrete needs more work or effort to

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  • The blending of GGBS & Fly Ash in cement

    It is common that incorporating Ground Granulated Blastfurnace Slag (GGBS) and / or Fly Ash in the Portland Cement (OPC). It will be advantages in lowering Rapid Chloride Permeability Test (RCPT) and minimising Alkali Silica Reaction (ASR) risk. In fact, triple blends (OPC / GGBS / Fly Ash) performs better than either the OPC/Fly Ash

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  • What is Silica Fume?

    Silica fume is a byproduct of producing silicon metal or ferrosilicon alloys. One of the most beneficial uses for silica fume is in concrete. Because of its chemical and physical properties, it is a very reactive pozzolan. Concrete containing silica fume can have very high strength and can be very durable. Silica fume is available

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  • Blended Cement in Malaysia

    In Malaysia, regarding the cement specifications on use of blended cement with 25% Fly-Ash, cement supplier sometimes will propose on use of Ground Granulated Blastfurnace Slag (GGBS) as an alternative to Fly-Ash based on the logistic reasons, location of factory, stock available & etc. 25% Fly-Ash specified in the project will fall under CEM IIB-V

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  • In term of low temperature, GGBS or Fly Ash better?

    In Malaysia, for temperature control, both partial substitution of Portland Cement (OPC) with Ground Granulated Blastfurnace Slag (GGBS) and Fly Ash reduces heat generation. However, the level of GGBS substitution can be higher, thus the reduction of temperature is higher then Fly Ash. For example, for a 2m thick section, a 30% Fly Ash replacement

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