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Compressive Strength Test (Japan)

LIST OF TEST RESULTS OF CONCRETE WITH SILICA CEMENT FROM SILICA JAPAN INC.

In Japan, concrete factory is obliged to get the apporval from JIS (Japan Industrial Standard) and the concrete only from such factories can be used for constructions. If mixing design of the concrete is set at 24N, the concrete over 27N by adding 3N at 56 days' test can be used for buildings, facilities and workpieces. If the finished concrete is 26N and below, it must be reeinforced or destroyed. There is a very strict regulation for the production of normal concrete in Japan. So there is no data of normal concrete in this list. Slump test is performed by using text mixer (60L). There are some data which do not show the volume of each materials when 1m3 is converted to 60L.

C= cement(kg/m3)
W= water(kg/m3)  
S= fine aggregate(kg/m3)
G= coarse aggregatet(kg/m3)
A= chemical
SW= silica cement admixture(kg/m3)
N= strange
S= sulmp
CS7 =Compressive Strength 7 Days
CS28 =Compressive Strength 28 Days

 

Test Performed on ISHINOMAKI Technical High School :

Mixing Design C W S G A SW CS7 CS28
30N - S21 407 185 786 878 4.07 20 28.8N 42.0N

On the compressive strength test the concrete strength was recorded 28.8 N on 7th day and 42 N on 28th days. It shows strength of concrete goes on increasing with time with use of silica cement admixture. Also by use of 5% silica cement admixture concrete strength can be highly increase from normal to higher value. Increase in strength proves that silica cement admixture is good to use along with cement for better construction result.

Test Performed on ABASHIRI PORT:

Mixing Design C W S G A SW CS7 CS28
50N - S8 430 144 700 1124 5.16 43 53.2N 68.0N

On the compressive strength test the concrete strength was recorded 53.2 N on 7th day and 68 N on 28th days. It shows strength of concrete goes on increasing with time with use of silica cement admixture. Also by use of 10% silica cement admixture concrete strength can be highly increase from normal to highest value. Increase in strength proves that silica cement admixture is good to use along with cement for better construction result.

On ISHINOMAKI Technical High School we use 5% silica cement admixture where as on ABASHIRI PORT we use 10% of silica cement admixture. Doing that on same type of cement we get 26 N more concrete compressive strength on 28th day result which proves with the higher % use of silica cement admixture we can achive more concrete strength.

Test Mixing Picture: