1. There are many types of concrete, how to order?
Malaysia have which type?
When we buy cement via the concrete truck, how to know if they give the correct concrete as in Type, Quality and Quantity that we want?

2. Why always every flats, apartments, condos and high rises have leaking problems from floor above after 10 to 15 years?

Wat is the difference between marble and granite? where we use this material?

concrete is just 1 type. depend what the strength of concrete u want. eg. if u order grade 40N concrete, mean that concrete can stand the force not below 40N/mm2. like he said need send to lab for cube test. however 21 days only u will know the final result as concrete need 21days to achieve that result which is 40N/mm2. usually after u cast a level, consulting engineer not allow u to cast another floor because they want o see the result first. but then also they don't want to hinder the process of work therefore they get the 7 days result. 7th day if got achieve desired strength maybe around 30N then they allow to proceed casting of next floor.

among so many readymix concrete supplier, YTL subsidiary aka buildcon concrete sdn bhd is the smartest concrete supplier. why I said so? the concrete they supply can achieve very close to 40N for 21 days strength maybe like 40.5N or 41N while the rest of concrete supplier achieve more maybe like 44N or 45N. yeah u not heard it wrong, why I said smart that YTL achieve close to 40N which less than other? it's because in concrete, the expensive ingredient is cement. the more cement, the higher the strength. YTL just so precise enough to control the quantity of cement they use so they won't use more but at the same time still can achieve the desire strength. the other supplier will use more because they afraid that the concrete strength will fall below hence they rather spend more cement and subsequently they can't achieve the best optimum qty like YTL do.

to answer ur 2nd question, it is due to the waterproofing layer damaged. it could be many reason, poor workmanship, when owner doing renovation punch through the layer. anyway, only kitchen, toilet and balcony require waterproofing layer on floor.

usually waterproofing vendor will give like 20 years warranty 1.

Thanks, for the valuable info.
So which readymix concrete grade is better?

I also understand that there are many types/methods of waterproofing. But which ones are better or reliable?

oh ya, concrete only 1 type. however there are additive can add depend what requirement u need. some additive meant for waterproofing, so by add that u have waterproof on the specific area u use. water very difficult to seep through. usually they apply this on ground floor which expose to weather while below is basement. then they apply 1 more waterproof layer before floor tile or stone so they have double protection.

there are other additive to increase the workability of concrete. normal concrete have slump test result 50mm +/- so the concrete will set very fast and can't travel long and flow not so smooth hence less mobility. use to cast the area where travel of concrete is minimal. by add the additive u achieve 75mm+/- and the concrete will not set quickly and flow well. we called it pump mix because when concrete got longer distance to travel, example from ground floor to 15th floor, u need that so concrete can flow well inside the pipe where they use the pump to pump it to higher level.

higher slump test result mean the concrete more watery la

both marble and granite is stone. extract from mountain usually. difference is marble is fragile compared to granite. but marble got vein. the vein on the surface make it so beautiful but at the same time those vein is the thing make it fragile. water might seep in, and also that is the fragile part where crack started.

granite is just 1 tone and look boring. it look consistent but also boring. some architect want very natural design hence marble give them the natural look which fit their requirement well.

marble - black emperado


granite - black Galaxy

depend what u want as I said. example floor slab usually require grade 25N concrete. of course u can use grade 40N but for what wasting that money to get more strength than what it require? wall and column require grade 40N concrete. anyway the strength of concrete doesn't support ur house. the 1 which give the strength to support the entire building is the steel bar inside the concrete. concrete just give a little compressive strength and protect the steel from rusty.

waterproofing which 1 better? of course is membrane type la. abt RM90/m2

ops, forgot answer ur 2nd question. marble and granite us natural stone hence look aesthetic. use on floor, wall, kitchen counter top, island. no budget then use tile la.

What thickness or type of re bar is recommended?

we called it diameter of rebar. according to structure drawing. it is the duty of structural engineer to calculate. contractor just follow the drawing. again it's depend on the structural load requirement. if they require 20mm diameter for storage room, u can do 32mm diameter. but what for wasting that money? it just require 20mm diameter of rebar to withstand the load. right?

what is ur profession by the way?

List price is now 19.25 for KV. Other location plus minus a bit.

Then got rebate from manufacturer. Rebate due to demand and supply of market. Cement is fast moving item, so not so much of expiry issue.

Just a few weeks ago, the rebate from cmcm is up to 8+. So only about 11+ per bag. Now rebate back down to 2+.

Hai iwubpreve boss,

Recently, i got a dilemma... I want to build a holiday house at my small small land...

But you know lah, now very HING steel structure. Modern and stylish.

So I wonder,

Steel structure vs RC structure
1) what are the pro and con of each
2) if i use steel structure, will i save some cost in foundation? Any estimated cost if there is at all any saving?

Thanks in advance.

Why the side is white colour ? They tape the side ?

Bro, for your own house ? Get granite. Harder and got more color and pattern to choose. Usually more expensive. Marble is popular in the 80s and 90s now seldom people use

Now usually people use tiles. Homogenous tile is good mah. Cheap and good. But if you are building a bungalow, then use granite lah. Got class

Thanx bro.

how to become rich without govt tender ?

No la. Jz for general knowledge. Me always confused between marble and granite.

may i know what is your job? engineer? so that i can expect whether you position can answer my query.

Your understanding of structural theory is a little way off, Concrete withstand compressive strength while steel rebar withstand tensile strength. Together the two material used together is called Reinforced Concrete. The steel rebar helps resist bending (moment) and tensile actions/force acted upon the component (beam, column and slab), but concrete is the one holding everything together.

Anyone know the difference between RC wall, Parapet Wall and Retaining Wall?