Rony
Moderator
Abstract: This research aims to study the utilization of waste from power plants, construction and
demolition, and agriculture by varying the ratios of flflue-gasdesulfurization (FGD) gypsum, construction
and demolition waste (CDW), and oil palm trunks (OPT) in concrete production. This research used
these as the raw materials for the production of concrete bricks of 15 × 15 × 15 cm. There were 12 ratios
of concrete brick, fifixing 5.5 wt% of FGD gypsum to replace Portland cement and substituting coarse
sand with 0 wt%, 25 wt%, 50 wt%, or 75 wt% of CDW, and gravel with 0 wt%, 0.5 wt%, and 1 wt% of
OPT. The initial binder:fifine aggregate:coarse aggregate ratio was 1:2:4 and the water to cement ratio
was 0.5, curing in water at room temperature for 28 days. Then, all concrete brick specimens were
tested for compressive strength and water absorption. From the experiment, it was found that the
highest compressive strength of concrete brick specimens was 45.18 MPa, which was produced from
5.5% gypsum without CDW and OPT, while 26.84 MPa was the lowest compressive strength obtained
from concrete bricks produced from 5.5% FGD gypsum, 75% CDW, and 1% OPT. In terms of usage,
all proportions can be applied in construction and building work because the compressive strength
and water absorption were compliant with the Thai Industrial Standard TIS 57-2530 and TIS 60-2516.
Keywords: concrete brick; FGD gypsum; construction and demolition waste; oil palm trunks
demolition, and agriculture by varying the ratios of flflue-gasdesulfurization (FGD) gypsum, construction
and demolition waste (CDW), and oil palm trunks (OPT) in concrete production. This research used
these as the raw materials for the production of concrete bricks of 15 × 15 × 15 cm. There were 12 ratios
of concrete brick, fifixing 5.5 wt% of FGD gypsum to replace Portland cement and substituting coarse
sand with 0 wt%, 25 wt%, 50 wt%, or 75 wt% of CDW, and gravel with 0 wt%, 0.5 wt%, and 1 wt% of
OPT. The initial binder:fifine aggregate:coarse aggregate ratio was 1:2:4 and the water to cement ratio
was 0.5, curing in water at room temperature for 28 days. Then, all concrete brick specimens were
tested for compressive strength and water absorption. From the experiment, it was found that the
highest compressive strength of concrete brick specimens was 45.18 MPa, which was produced from
5.5% gypsum without CDW and OPT, while 26.84 MPa was the lowest compressive strength obtained
from concrete bricks produced from 5.5% FGD gypsum, 75% CDW, and 1% OPT. In terms of usage,
all proportions can be applied in construction and building work because the compressive strength
and water absorption were compliant with the Thai Industrial Standard TIS 57-2530 and TIS 60-2516.
Keywords: concrete brick; FGD gypsum; construction and demolition waste; oil palm trunks