scholarly journals CREEP BEHAVIOR OF HIGH-STRENGTH CONCRETE IN EARLY AGE UNDER VARIABLE LOAD

2003 ◽  
Vol 68 (574) ◽  
pp. 1-8
Author(s):  
Shinji HAGIHARA ◽  
Yoshihiro MASUDA ◽  
Shigeharu NAKAMURA
Keyword(s):  
Creep Behavior ◽  
High Strength Concrete ◽  
High Strength ◽  
Early Age ◽  
Variable Load ◽  
Strength Concrete

scholarly journals Experiment and Analysis on Early-Age Cracking of Reinforced High-Strength Concrete Column and Beam

1999 ◽  
Vol 10 (1) ◽  
pp. 51-63 ◽  
Author(s):  
Hiroshi Hashida ◽  
Yasuhiro Kuroda ◽  
Nobuyuki Yamazaki ◽  
Fuminori Tomosawa
Keyword(s):  
High Strength Concrete ◽  
High Strength ◽  
Early Age ◽  
Concrete Column ◽  
Strength Concrete

scholarly journals Early-Age Tensile Basic Creep Behavioral Characteristics of High-Strength Concrete Containing Admixtures

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Tongyuan Ni ◽  
Yang Yang ◽  
Chunping Gu ◽  
Jintao Liu ◽  
Jin Chen ◽  
...  
Keyword(s):  
High Strength Concrete ◽  
High Strength ◽  
Plain Concrete ◽  
Tensile Creep ◽  
Mineral Admixtures ◽  
Basic Creep ◽  
Early Age ◽  
Strength Concrete ◽  
Holding Period ◽  
Linear Characteristic

Tensile creep is an important parameter to evaluate cracking probability of high-strength concrete (HSC) structure, and the mineral admixtures have great effect on it. In this paper, the early-age tensile basic creep behaviors of HSC containing fly ash (FA) and blast furnace slag (BS) were investigated by experiments, and the influences of loading age and stress level (stress-strength ratio of initial loading) were evaluated. The results showed that FA promoted the early-age tensile basic creep while BS inhibited the early-age tensile creep. Moreover, the influence of loading age on early-age tensile basic creep of HSC was more significant, and the affected ages’ duration was longer than that of plain concrete. The early-age tensile basic creep of HSC containing admixtures also showed linear creep characteristic after a certain age as HSC without admixtures, and the linear characteristic was more obvious at a later loading age. The tensile basic creep velocity of HSC containing FA was the highest, while HSC containing BS exhibited the lowest velocity. The influence of admixtures on velocities of tensile basic creep was gradually attenuated with the age growth in holding period.

Influence of Metakaolin on Strength and Microstructure of Steam-Cured High-Strength Concrete

2013 ◽  
Vol 838-841 ◽  
pp. 42-46 ◽  
Author(s):  
Jun Jie Zeng ◽  
Zhi Hong Fan ◽  
Long Chen
Keyword(s):  
Compressive Strength ◽  
High Strength Concrete ◽  
High Strength ◽  
Pozzolanic Reaction ◽  
Early Age ◽  
Test Results ◽  
Replacement Level ◽  
Strength Concrete ◽  
Pozzolanic Reactivity ◽  
Compressive Strength Test

The influence of metakaolin (MK) on strength and microstructure of steam-cured high-strength concrete has been investigated using compressive strength test, XRD, MIP and SEM. Three MK replacement levels were considered in the study: 5%, 10% and 15% by weight of cement. A mix double blended with 10% MK and 10% slag was prepared too. Test results have indicated that MK can increase the compressive strength of steam-cured concrete, especially at early age. Compressive strength up to 90MPa at 1 and 28 days is obtained with the incorporation of 10% MK and 10% slag. When the replacement level of MK is higher than 10%, the enhancement of strength becomes less significant. Content of Ca (OH)2 crystals is decreased while content of hydrates with Al is increased due to the pozzolanic reactivity of MK. Concrete pore structure is significantly refined and a denser hydrates structure is obtained due to the pozzolanic reaction and filler effect of MK. Meanwhile, combination of aggregate and paste is enhanced too. The improvements of strength and microstructure become more obvious when MK and slag are double incorporated.

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