ปริมาณที่เหมาะสมของการใช้คอนกรีตเก่าบดละเอียดที่มีขนาดอนุภาคแตกต่างกันสำหรับกำลังอัดสูงสุดของมอร์ตาร์ในงานปูนฉาบ (OPTIMUM USAGE OF RECYCLE CONCRETE WITH DIFFERENT PARTICLE SIZE FOR COMPRESSIVE STRENGTH OF MORTAR PLASTERING)

Abstract

This research aims to determine the optimum usage of finely crushed recycle concrete with different median particle sizes for replacing sand for the maximum compressive strength of mortar plastering at 7, 14 and 28 days. Control of percent slump flow at 110±5. The scrap bored piled, design compressive strength of 240 kg/cm². for converged  recycle concrete with the median particle sizes of 0.149-1.190 mm. were used to replace sand at the rate of 0-30% by weight.

          The results revealed that increasing of median particlesize offinely crushed recycle concrete caused to the decreasing of compressive strength. The mortar plastering had the maximum compressive strength for sand has been replaced with finely crushed recycle concrete small particle sizes of 0.149-0.297 mm. Andit can be developed to the maximum compressive strength of 109.06 kg/cm². 135.86 kg/cm². and 139.15 kg/cm². The optimum usage of finely crushed recycle concrete as 28%, 30% and 30% for the particle size of small, medium and large respectively