TY - JOUR
T1 - Conceptual design and performance evaluation of two-stage ultra-low binder ultra-high performance concrete
AU - Li, Peipeng
AU - Yu, Qingliang
AU - Brouwers, Jos
AU - Chen, Wei
PY - 2019/11
Y1 - 2019/11
N2 - This study proposes a novel concept of two-stage ultra-high performance concrete (TS-UHPC), towards ultra-low binder consumption. The effects of grout and coarse aggregate are investigated and their compatibility is evaluated. Results show that TS-UHPC has a low binder amount (down to 364 kg/m3) and high binder efficiency (up to 0.417 MPa·m3/kg), possessing excellent compressive strength of up to 151.8 MPa at 91 days. Microstructural analysis reveals that grout with a sand-to-powder ratio of 1.0 shows a higher hydration degree, denser structure, and increased later strength. Coarser basalt aggregate tends to slightly lower compressive and splitting tensile strength, 14% and 12% reduction with the maximum size from 8 mm to 25 mm, respectively. The TS-UHPC has an excellent interfacial transition zone that induces a water-permeable porosity of 0.91%–1.32%. New formulas are proposed to describe correlation between compressive and splitting tensile strength of TS-UHPC, and to predict strength of TS-UHPC by grout.
AB - This study proposes a novel concept of two-stage ultra-high performance concrete (TS-UHPC), towards ultra-low binder consumption. The effects of grout and coarse aggregate are investigated and their compatibility is evaluated. Results show that TS-UHPC has a low binder amount (down to 364 kg/m3) and high binder efficiency (up to 0.417 MPa·m3/kg), possessing excellent compressive strength of up to 151.8 MPa at 91 days. Microstructural analysis reveals that grout with a sand-to-powder ratio of 1.0 shows a higher hydration degree, denser structure, and increased later strength. Coarser basalt aggregate tends to slightly lower compressive and splitting tensile strength, 14% and 12% reduction with the maximum size from 8 mm to 25 mm, respectively. The TS-UHPC has an excellent interfacial transition zone that induces a water-permeable porosity of 0.91%–1.32%. New formulas are proposed to describe correlation between compressive and splitting tensile strength of TS-UHPC, and to predict strength of TS-UHPC by grout.
KW - Binder efficiency
KW - Compatibility
KW - ITZ
KW - Prediction model
KW - Two stage ultra-high performance concrete
UR - http://www.scopus.com/inward/record.url?scp=85071978948&partnerID=8YFLogxK
U2 - 10.1016/j.cemconres.2019.105858
DO - 10.1016/j.cemconres.2019.105858
M3 - Article
SN - 0008-8846
VL - 125
JO - Cement and Concrete Research
JF - Cement and Concrete Research
M1 - 105858
ER -