Abstract

Development in the construction sector continues to increase.The most common building material nowadays is concrete.Although normal concrete is often is being used, at this time high strength concrete and lightweight concrete have also been widely used in construction.In the codes for concrete materials, either SNI 03-6805-2002 or PBI NI-2 1971, it is stated about the assessment factor of compressive strength development for normal concrete according to the age of the concrete.However, these codes have not accommodated the assessment factor for high-strength and lightweight concrete.An experimental approach was used to determine the assessment factor and is discussed in this paper.The specimens were cylinders of high strength concrete, normal concrete, and lightweight concrete and tested for compressive strength after curing times of 3, 7, 14, 21, 28 days, 56, and 90 days.According to the experimental result, it presents that the concrete compressive strength increases with the increasing of concrete age.The assessment factor for the development of compressive strength of high-strength concrete shows the highest value, while lightweight concrete provides the lowest factor.The assessment factors of compressive strength development for normal concrete lie in between the values given in PBI NI-2 1971 and SNI 03-6805-2002.Meanwhile, the assessment factors stated in SNI 03-6805-2002 retains the highest value.

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