A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Predictions of long-term deflection of geopolymer concrete beams
Highlights Geopolymer concrete can be used for sustainable structural design. EMM and AEMM give closer agreement on deflection prediction than RCM for geopolymer concrete. Crack status should be considered throughout the analysis at all ages.
Abstract The long-term behaviour of concrete beams constructed with geopolymer concrete (GPC) is investigated. Self-weight and sustained load of 1kPa are applied on top of the beams at the age of 14days to simulate construction conditions. Creep tests on cylinders conducted with sustained loading commenced at the ages of 14days and 28days. The results from creep tests on GPC show higher creep in the specimens loaded at 14days than those loaded at 28days. Predictions of beam deflections are performed by using RCM, EMM and AEMM with input parameters of properties of GPC from experimental data, including elastic modulus, modulus of rupture, creep and shrinkage. These property tests show that GPC can achieve sufficient strength for structural designs, but both compressive strength and flexural tensile strength are affected by drying, which causes differential drying shrinkage and microcracking at the drying surfaces. The predicted deflections by these analysis methods are compared with the experimental results from beams, and show that RCM gives the worse performance of the three methods. The investigation concludes that the AEMM can be used for long-term deflection calculations for GPC beams with minor parameter modifications.
Predictions of long-term deflection of geopolymer concrete beams
Highlights Geopolymer concrete can be used for sustainable structural design. EMM and AEMM give closer agreement on deflection prediction than RCM for geopolymer concrete. Crack status should be considered throughout the analysis at all ages.
Abstract The long-term behaviour of concrete beams constructed with geopolymer concrete (GPC) is investigated. Self-weight and sustained load of 1kPa are applied on top of the beams at the age of 14days to simulate construction conditions. Creep tests on cylinders conducted with sustained loading commenced at the ages of 14days and 28days. The results from creep tests on GPC show higher creep in the specimens loaded at 14days than those loaded at 28days. Predictions of beam deflections are performed by using RCM, EMM and AEMM with input parameters of properties of GPC from experimental data, including elastic modulus, modulus of rupture, creep and shrinkage. These property tests show that GPC can achieve sufficient strength for structural designs, but both compressive strength and flexural tensile strength are affected by drying, which causes differential drying shrinkage and microcracking at the drying surfaces. The predicted deflections by these analysis methods are compared with the experimental results from beams, and show that RCM gives the worse performance of the three methods. The investigation concludes that the AEMM can be used for long-term deflection calculations for GPC beams with minor parameter modifications.
Predictions of long-term deflection of geopolymer concrete beams
Un, C.H. (author) / Sanjayan, J.G. (author) / San Nicolas, R. (author) / van Deventer, J.S.J. (author)
Construction and Building Materials ; 94 ; 10-19
2015-06-12
10 pages
Article (Journal)
Electronic Resource
English
Predictions of long-term deflection of geopolymer concrete beams
| British Library Online Contents | 2015
Predictions of long-term deflection of geopolymer concrete beams
| Online Contents | 2015
LONG-TERM DEFLECTION OF REINFORCED CONCRETE BEAMS
| TIBKAT | 2020
Long-term deflection of continuous fiber reinforced concrete beams
| British Library Conference Proceedings | 1995
Long-Term Deflection of Reinforced Self-Consolidating Concrete Beams
| Online Contents | 2009