A STUDY OF LIGHTWEIGHT CONCRETE ADMIXED WITH PERLITE
Keywords:
Perlite, natural pozzolan, lightweight concreteAbstract
The purpose of this study is to develop a lightweight concrete by admixing with perlite. The concrete is targeted to have a density of less than 2000 kg/m3 and a 28-day compressive strength of not less than 30 MPa. The control group concrete was designed to have a compressive strength at 44 MPa. Perlite was then used to replace sand at 30, 40, and 50% by mass (resulting in concrete of a strength less than the targeted 30 MPa). The compressive strength of the control group concrete was increased by 25 and 50% (by increasing the cement content) for the next trial mixes. The workability of the fresh concrete was controlled to have a slump at 80-100 mm. It was found that the 125% compressive strength control group with 30 to 50% of the sand replaced with perlite reduced the density from 2479 kg/m3 to 2086-1917 kg/m3 and reduced the compressive strength from 84.1 MPa to 53.9-40.3 MPa. For the 150% compressive strength control group with 30 to 50% of the sand replaced with perlite the density was reduced from 2458 kg/m3 to 2121-1783 kg/m3 and the compressive strength was reduced from 84.5 MPa to 54.2-31.8 MPa.
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