Basic Research Regarding the Strength Characteristics of Light-Weight Concrete that used the Lapilli
By Tadashi Nagamori
Concrete Research and Technology
Vol.17, No.1, Jan 2006 (Issue 40)
- Synopsis:
- This research examined the use of Lapilli as a concrete aggregate resource for the purpose of effective utilization and reduction of weight. And various design of mix proportion that replaced an artificial coarse light-weight aggregate with Lapilli was carried out, and their basic nature was examined. As a result, the strength felled when replacement rate of Lapilli was heightened. However, when water-cement ratio has become 50% or less and when unit cement quantity was made 400 kg/m3, compressive strength was recorded 24N/mm2 with 50% replacement rate and recorded 15 N/mm2 at 100% replacement rate. Also between the compressive strength and static modulus of elasticity, comparatively favorable correlation nature was shown in 50% of replacement rates. And the increase of concrete strength was confirmed when concrete was cured for a long length of time. Therefore, the effectiveness of case that replaced a light-weight concrete with Lapilli within 50% was confirmed.
- Keywords:
- Lapilli, light-weight concrete, replacement rate, compressive strength
