This document discusses research into using cement clinker (CC) and rice husk ash (RuRHA) to improve the sustainability of self-consolidating concrete (SCC). The research tested different mixtures of SCC containing CC and RuRHA and evaluated their water requirement, flow properties, compressive strength, and acid resistance. The results showed that while SCC mixtures with CC and RuRHA had higher water needs and lower compressive strength compared to normal SCC, they exhibited improved flowability. Additionally, SCC with CC and RuRHA demonstrated higher degradation in acid environments than normal SCC. The document concludes that while CC can help enhance some properties of SCC when used with RuRHA, it also

1. International workshop - Recycling in construction sector - from
material characterization to contribution in the circular economy
Department of Building Technology, Faculty of Industrial
Technology, Phranakhon Rajabhat University,
9 Changwattana Road,
Bangkhen Bangkok, 10220, Thailand
E-mail: shinomomo7@gmail.com, Tel. and Fax: (+662)
522-6637

2. International workshop - Recycling in construction sector - from material
characterization to contribution in the circular economy
Reinforcing steel and filling of confined space;
therefore, high performance concrete (HPC)
Self-consolidating concrete (SCC)
SCC requires a large quantity of
powdered material
SCC may not be ideal for
sustainable concrete in the future
Highly porous residual-unprocessed
rice husk ash (RuRHA)
CC is used as a cement substitute
material to act as a filler for the
voids in RuRHA
RHA
CC

3. International workshop - Recycling in construction sector - from material
characterization to contribution in the circular economy

4. International workshop - Recycling in construction sector - from material
characterization to contribution in the circular economy

5. International workshop - Recycling in construction sector - from material
characterization to contribution in the circular economy

6. International workshop - Recycling in construction sector - from material
characterization to contribution in the circular economy

7. International workshop - Recycling in construction sector - from material
characterization to contribution in the circular economy
(b) Slump flow test
(a) V-funnel flow test
(c) J-ring test

8. International workshop - Recycling in construction sector - from material
characterization to contribution in the circular economy

9. International workshop - Recycling in construction sector - from material
characterization to contribution in the circular economy
Water requirements of SCC mixtures Unit weights of fresh SCC mixtures

10. International workshop - Recycling in construction sector - from material
characterization to contribution in the circular economy
Compressive strengths of SCC mixtures

11. International workshop - Recycling in construction sector - from material
characterization to contribution in the circular economy
Compressive strengths of SCC mixtures
0
10
20
30
40
50
60
70
0 15 30 45 60 75 90 105 120
500RuRHA0
500RuRHA0CC3(20)
500RuRHA0CC3(40)
500RuRHA0CC7(20)
500RuRHA0CC7(40)
500RuRHA0CC23(20)
500RuRHA0CC23(40)
Compressivestrength(MPa)
Elapsed time (days)
OPC
RHA
CC

12. International workshop - Recycling in construction sector - from material
characterization to contribution in the circular economy
Weight losses under sulfuric acid attack of SCC mixtures
containing varying types and amounts of CC

13. International workshop - Recycling in construction sector - from material
characterization to contribution in the circular economy
1. The water use of CC-containing SCC was higher than the
w/p of control SCC (no CC and RuRHA).
2. The unit weight of SCC in the fresh state with and
without RuRHA decreased from the nominal 100% control
SCC.
3. The flow slump of SCC containing CC is considerably
increased. When considering the time to reach 500 mm in
diameter, using CC can reduce the flow time due to its high
air content, which improves the flow characteristics of SCC.
4. SCC mixed with CC and RuRHA had lower compressive
strength than control SCC due to the low reactivity of
highly crystalline CC.
5. When using CC to replace PC, SCC and SCC prepared with
RuRHA had a higher rate of weight loss than the control
SCC, and the weight loss of SCC was higher than that of the
control SCC.
OPC
RHA
CC

14. International workshop - Recycling in construction sector - from material
characterization to contribution in the circular economy
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