TY - JOUR
T1 - Performance evaluation of cementless composites with alkali-sulfate activator for field application
AU - Lee, Jaehyun
AU - Lee, Taegyu
AU - Lee, Seungwoo
AU - Choi, Hyeonggil
N1 - Publisher Copyright:
© 2020 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2020/12/1
Y1 - 2020/12/1
N2 - This study analyzed the performance evaluation of alkali-activated composites (AAC) with an alkali-sulfate activator and determined the expected effects of applying AACs to actual sites. Results revealed that when the binder weight was increased by 100 kg/m3 at 7 days of age, the homogel strength of ordinary Portland cement (OPC) and AAC increased by 0.9 and 5.0 MPa, respectively. According to the analysis of the matrix microstructures at 7 days of age, calcium silicate hydrates (C–S–H, Ca1.5SiO3.5·H2O) and ettringite (Ca6Al2(SO4)3(OH)12·26H2O) were formed in AAC, which are similar hydration products as found in OPC. Furthermore, the acid resistance analysis showed that the mass change of AAC in HCl and H2SO4 solutions ranged from 36.1% to 88.0%, lower than that of OPC, indicating AAC’s superior acid resistance. Moreover, the OPC and AAC binder weight ranges satisfying the target geltime (20–50 s) were estimated as 180.1–471.1 kg/m3 and 261.2–469.9 kg/m3, respectively, and the global warming potential (GWP) according to binder weight range was 102.3–257.3 kg CO2 eq/m3 and 72.9–126.0 kg CO2 eq/m3. Therefore, by applying AAC to actual sites, GWP is expected to be 29.5 (28.8%)–131.3 (51.0%) kg CO2 eq/m3 less than that of OPC.
AB - This study analyzed the performance evaluation of alkali-activated composites (AAC) with an alkali-sulfate activator and determined the expected effects of applying AACs to actual sites. Results revealed that when the binder weight was increased by 100 kg/m3 at 7 days of age, the homogel strength of ordinary Portland cement (OPC) and AAC increased by 0.9 and 5.0 MPa, respectively. According to the analysis of the matrix microstructures at 7 days of age, calcium silicate hydrates (C–S–H, Ca1.5SiO3.5·H2O) and ettringite (Ca6Al2(SO4)3(OH)12·26H2O) were formed in AAC, which are similar hydration products as found in OPC. Furthermore, the acid resistance analysis showed that the mass change of AAC in HCl and H2SO4 solutions ranged from 36.1% to 88.0%, lower than that of OPC, indicating AAC’s superior acid resistance. Moreover, the OPC and AAC binder weight ranges satisfying the target geltime (20–50 s) were estimated as 180.1–471.1 kg/m3 and 261.2–469.9 kg/m3, respectively, and the global warming potential (GWP) according to binder weight range was 102.3–257.3 kg CO2 eq/m3 and 72.9–126.0 kg CO2 eq/m3. Therefore, by applying AAC to actual sites, GWP is expected to be 29.5 (28.8%)–131.3 (51.0%) kg CO2 eq/m3 less than that of OPC.
KW - Acid resistance properties
KW - Alkali-activated composites (AAC)
KW - Alkali-sulfate activator
KW - CO reduction properties
KW - Engineering properties
UR - http://www.scopus.com/inward/record.url?scp=85097033635&partnerID=8YFLogxK
U2 - 10.3390/ma13235410
DO - 10.3390/ma13235410
M3 - Article
AN - SCOPUS:85097033635
SN - 1996-1944
VL - 13
SP - 1
EP - 14
JO - Materials
JF - Materials
IS - 23
M1 - 5410
ER -