Internally cured high performance concrete with magnesium based expansive agent using coal bottom ash particles as water reservoirs

2020 ◽  
Vol 251 ◽  
pp. 118977 ◽  
Author(s):  
Roberto Rodríguez-Álvaro ◽  
B. González-Fonteboa ◽  
S. Seara-Paz ◽  
Khandaker M.A. Hossain
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Bottom Ash ◽  
Water Reservoirs ◽  
Coal Bottom Ash ◽  
Expansive Agent

Influence of CaO-Based Expansive Agent on the Deformation Behavior of High Performance Concrete

2013 ◽  
Vol 438-439 ◽  
pp. 113-116
Author(s):  
Shou Zhi Zhang ◽  
Qian Tian ◽  
An Qun Lu
Keyword(s):  
Deformation Behavior ◽  
High Performance ◽  
High Performance Concrete ◽  
Control Volume ◽  
Autogenous Shrinkage ◽  
Drying Shrinkage ◽  
Volume Stability ◽  
Expansive Agent ◽  
Effective Expansion ◽  
New Type

In order to improve the volume stability of high performance concrete, the effects of deformation behavior of high performance concrete containing CaO-based expansive agent were investigated. Concrete samples prepared without or with CaO-based expansive agent were compared through expansion under water curing at 20°C, drying shrinkage and autogenous shrinkage measurements. According to the experimental and analytical results, the new type expansive agent can control volume stability for high performance concrete. The addition of 10% CaO-based expansive agent not only built effective expansion in high performance concrete whatever under saturated condition or under sealed condition, but also substantially reduced its drying shrinkage.

Study on the Effect of Different Admixtures on the Early Autogenous Shrinkage of High Performance Concrete of Bridge Deck Pavement

2013 ◽  
Vol 857 ◽  
pp. 56-63 ◽  
Author(s):  
Xiang Qian Li ◽  
Bo Tian ◽  
Wei Liu ◽  
She Su
Keyword(s):  
Fly Ash ◽  
High Performance ◽  
Bridge Deck ◽  
High Performance Concrete ◽  
Autogenous Shrinkage ◽  
Reducing Agent ◽  
Inhibition Mechanism ◽  
Expansive Agent ◽  
Bridge Deck Pavement ◽  
Shrinkage Reducing Agent

This paper analyzed the mechanism of early autogenous shrinkage of concrete, and studied the influence of early autogenous shrinkage of high performance concrete-(HPC) admixed with different kinds of materials of bridge deck pavement. Four different concrete mixes were used: fiber, fiber plus expansive agent, fiber plus fly ash and fiber plus shrinkage-reducing agent. The result shows that the four different mixes can inhibit the autogenous shrinkage of HPC to a certain extent, the inhibitory effect of different mixes in the order of strong to weak is: fiber plus shrinkage-reducing agent, fiber plus fly ash, fiber plus expansive agent, and fiber itself. Furthermore, the inhibition mechanism of each mix was analyzed and a conclusion of mixture of fiber plus fly ash to be the best choice considered of economic and working performance is drawn as well.

Sign in / Sign up

Export Citation Format

Share Document