scholarly journals Research on mix proportion and solid rebound detection of high strength concrete in super high rise building

2020 ◽  
Vol 198 ◽  
pp. 01004
Author(s):  
Zhonghai Hao
Keyword(s):  
High Strength Concrete ◽  
High Strength ◽  
Test Results ◽  
Core Drilling ◽  
Strength Concrete ◽  
High Rise ◽  
High Rise Building ◽  
Mix Proportion ◽  
Drilling Method ◽  
Building Engineering

At present, the application of high performance concrete in super high-rise building engineering structure is more and more extensive. The mix proportion of high-strength concrete is the basic variable of concrete, and the rebound detection of building structure is carried out. On this basis, the design method of building pressure matching is proposed. Due to the large error of the estimated value of the strength test curve unified by the whole country, in a new project in Xi’an, the rebound method and core drilling method are carried out on several concrete members, and it is concluded that the test results of rebound method and core drilling method with different strength levels are quite different. In view of the difference of test results of mix proportion rebound method of high-strength concrete of super high-rise buildings in Xi’an area, the correction method of rebound difference of different strength levels is put forward.

scholarly journals High-rise Building Operations using Ultra High Strength Concrete with a Design Strength of 200 MPa

2011 ◽  
Vol 49 (8) ◽  
pp. 8_37-8_42 ◽  
Author(s):  
K. Yamamoto ◽  
T. Nakajima ◽  
S. Watanabe ◽  
Y. Shimizu
Keyword(s):  
High Strength Concrete ◽  
High Strength ◽  
Design Strength ◽  
Strength Concrete ◽  
High Rise ◽  
High Rise Building

scholarly journals Application of High-strength Concrete with 60 MPa to High-rise Building

1995 ◽  
Vol 33 (9) ◽  
pp. 29-39 ◽  
Author(s):  
K. Kuroha ◽  
S. Namiki ◽  
S. Kasai ◽  
T. Kobayashi
Keyword(s):  
High Strength Concrete ◽  
High Strength ◽  
Strength Concrete ◽  
High Rise ◽  
High Rise Building

scholarly journals Structural Design of 80-Story RC High-Rise Building Using 200 Mpa Ultra-High-Strength Concrete

2007 ◽  
Vol 5 (2) ◽  
pp. 181-191 ◽  
Author(s):  
Hideki Kimura ◽  
Tadao Ueda ◽  
Kazuo Ohtake ◽  
Atsushi Kambayashi
Keyword(s):  
Structural Design ◽  
High Strength Concrete ◽  
High Strength ◽  
Strength Concrete ◽  
High Rise ◽  
High Rise Building

Effects of Nano-CaCO3 on the Compressive Strength and Microstructure of High Strength Concrete in Different Curing Temperature

2011 ◽  
Vol 121-126 ◽  
pp. 126-131 ◽  
Author(s):  
Qing Lei Xu ◽  
Tao Meng ◽  
Miao Zhou Huang
Keyword(s):  
Compressive Strength ◽  
Low Temperature ◽  
High Strength Concrete ◽  
High Strength ◽  
Curing Temperature ◽  
Test Results ◽  
Strength Concrete ◽  
Calcium Nitrite ◽  
Orientation Index ◽  
Early Strength

In this paper, effects of nano-CaCO3 on compressive strength and Microstructure of high strength concrete in standard curing temperature(21±1°C) and low curing temperature(6.5±1°C) was studied. In order to improve the early strength of the concrete in low temperature, the early strength agent calcium nitrite was added into. Test results indicated that 0.5% dosage of nano-CaCO3 could inhibit the effect of calcium nitrite as early strength agent, but 1% and 2% dosage of nano-CaCO3 could improve the strength of the concrete by 13% and 18% in standard curing temperature and by 17% and 14% in low curing temperature at the age of 3days. According to the XRD spectrum, with the dosage up to 1% to 2%, nano-CaCO3 can change the orientation index significantly, leading to the improvement of strength of concrete both in standard curing temperature and low curing temperature.

Effect of Chopped Basalt Fiber on the Fresh and Hardened Properties of Fly Ash High Strength Concrete

2014 ◽  
Vol 567 ◽  
pp. 381-386 ◽  
Author(s):  
Nasir Shafiq ◽  
Muhd Fadhil Nuruddin ◽  
Ali Elheber Ahmed Elshekh ◽  
Ahmed Fathi Mohamed Salih
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
High Strength Concrete ◽  
Basalt Fiber ◽  
High Strength ◽  
Progressive Increase ◽  
Test Results ◽  
Strength Concrete ◽  
Hardened Properties ◽  
Chopped Basalt Fiber

In order to improve the mechanical properties of high strength concrete, HSC, several studies have been conducted using fly ash, FA. Researchers have made it possible to achieve 100-150MPa high strength concrete. Despite the popularity of this FAHSC, there is a major shortcoming in that it becomes more brittle, resulting in less than 0.1% tensile strain. The main objective of this work was to evaluate the fresh and hardened properties of FAHSC utilizing chopped basalt fiber stands, CBFS, as an internal strengthening addition material. This was achieved through a series of experimental works using a 20% replacement of cement by FA together with various contents of CBFS. Test results of concrete mixes in the fresh state showed no segregation, homogeneousness during the mixing period and workability ranging from 60 to 110 mm. Early and long terms of compressive strength did not show any improvement by using CBFS; in fact, it decreased. This was partially substituted by the effect of FA. Whereas, the split and flexural strengths of FASHC were significantly improved with increasing the content of CBFS as well as the percentage of the split and flexural tensile strength to the compressive strength. Also, test results showed a progressive increase in the areas under the stress-strain curves of the FAHSC strains after the CBFS addition. Therefore, the brittleness and toughness of the FAHSC were enhanced and the pattern of failure moved from brittle failure to ductile collapse using CBFS. It can be considered that the CBFS is a suitable strengthening material to produce ductile FAHSC.

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