دراسة تأثير نسبة الفحم المضاف و حجم حبيباته في متانة انضغاط طابوق البناء

الملخص EN

The influence of additive coal percentage and its grain size on compressive strength of building bricks were studied .Soil was used as a basic material and coal was added to it, with weight percentage of (0.1,0.2,0.5,1,3,5,10)% for three grain sizes.

The samples were compressed in cubic shapes of 5cm edge, fired at (1100°C).

Porosity , water absorption , lost weight and compressive strength were calculated for each sample.

It was found that there is a close relationship between compressive strength and additive coal percentage and its grain size ,where compressive strength increases for low weight percentage (0.2-0.5)% and fine grain size (75-150) |im and the highest value of compressive strength was recorded with the range of (400kg.f/cm ).

On the other hand compressive strength decreases with the additive coal and grain size increase where the samples of high percentage of weight (10%) and coarse grain size(300-600) |im has recorded the less value of compressive strength .

So the obtained brick has a high quality of Porosity ,water absorption and compressive strength that the Iraqi standard of qualification No.(25) class A.