scholarly journals A CALCULATION METHOD OF AUTOGENOUS SHRINKAGE STRESS IN HIGH-STRENGTH CONCRETE STRUCTURES SUBJECTED TO ELEVATED TEMPERATURE AT EARLY AGE

2000 ◽  
Vol 65 (537) ◽  
pp. 7-12 ◽  
Author(s):  
Hiroshi HASHIDA ◽  
Nobuyuki YAMAZAKI
Keyword(s):  
Elevated Temperature ◽  
Calculation Method ◽  
High Strength Concrete ◽  
Concrete Structures ◽  
Autogenous Shrinkage ◽  
High Strength ◽  
Shrinkage Stress ◽  
Early Age ◽  
Strength Concrete

scholarly journals Experimental study of accelerating early age concrete strength under elevated temperature, steaming, and chemical admixture addition of normal and high strength concrete

2018 ◽  
Vol 195 ◽  
pp. 01025
Author(s):  
Suryawan Murtiadi ◽  
Akmaluddin Akmaluddin ◽  
Buan Anshari ◽  
Suparjo Suparjo
Keyword(s):  
Elevated Temperature ◽  
High Strength Concrete ◽  
Concrete Strength ◽  
High Strength ◽  
Early Age ◽  
Test Results ◽  
Steam Curing ◽  
Strength Concrete ◽  
Heating Treatment ◽  
Early Age Concrete

Conventionally, curing is performed by moisturizing concrete periodically when the fresh concrete is still undergoing chemical reaction processes. This study is focused on early age concrete strength treated with special curing of early heating treatment and steaming. The addition of chemical accelerator and normal curing are also examined. Tests were conducted on normal and high strength concrete specimens. Treatments of the test specimens with steaming and early heating were carried out for 3 and 8 hours, respectively, at a temperature of about 70° C. Test results showed that concrete compressive strengths gained in 3-days compared to 28-days under normal curing, chemical accelerator, steam curing, and elevated temperature curing were 39%, 50%, 64% and 59%, respectively. While in 7-days were 66%, 75%, 80% and 83%, respectively. And in 14- days were 87%, 91%, 93% and 93%, respectively. For high-strength concrete, the compressive strengths gained in 3-days were 37%, 62%, 68% and 71%, respectively. The strengths in 7-days were 65%, 77%, 83% and 82%, respectively. And in 14-days were 85%, 89%, 90% and 93%, respectively. Test results indicated that the additions of chemical accelerator, steam and elevated temperature curing in order to obtain the high early age concrete strengths are highly recommended.

Influence of Barchip fiber on early-age autogenous shrinkage of high strength concrete

2020 ◽  
Vol 256 ◽  
pp. 119223 ◽  
Author(s):  
Dejian Shen ◽  
Chuyuan Wen ◽  
Pengfei Zhu ◽  
Yuhua Wu ◽  
Jiaojiao Yuan
Keyword(s):  
High Strength Concrete ◽  
Autogenous Shrinkage ◽  
High Strength ◽  
Early Age ◽  
Strength Concrete

Analysis of seismic performance and research of load capacity of steel reinforced high strength concrete columns with rectangular helical hoops

2020 ◽  
pp. 136943322098165
Author(s):  
Jianyang Xue ◽  
Xin Zhang ◽  
Xiaojun Ke
Keyword(s):  
Failure Mode ◽  
Seismic Performance ◽  
Calculation Method ◽  
High Strength Concrete ◽  
Failure Modes ◽  
Shear Failure ◽  
High Strength ◽  
Shear Capacity ◽  
Strength Concrete ◽  
Shear Span

This paper mainly focused on the seismic performance and shear calculation method of steel reinforced high-strength concrete (SRHC) columns with rectangular helical hoops. An experimental investigation was performed in this paper. Eleven SRHC columns with rectangular helical hoops and one with ordinary hoops were constructed at the laboratory of Guangxi university. The failure modes, hysteresis loops, envelope curves, characteristic loads and displacements and cumulative damage analysis are presented and investigated. It can be seen from the test results that the failure modes of SRHC columns can be divided into three types with the shear span ratio increased, namely, shear baroclinic failure mode, flexure-shear failure mode and flexure failure mode. In addition, the specimens with rectangular helical hoops have plumper hysteretic loops. Shear span ratio is the main influencing factor of characteristic load; the axial compression ratio and concrete strength have less influence on characteristic load, while stirrup ratio has little effect on the characteristic load. Finally, a calculation method for shear capacity of SRHC columns under shear baroclinic failure and flexure-shear failure mode is proposed.

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