Gas permeability of alumina–spinel refractory castables bonded with hydratable magnesium carboxylate

Sun, Lin; Ding, Donghai; Xiao, Guoqing; Chen, Jianjun; Li, Yanjun; Kang, Jian; Chong, Xiaochuan; Lei, Changkun; Luo, Jiyuan; Zheng, Xin

doi:10.1111/jace.19363

Cited by 6 publications

(1 citation statement)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 2b demonstrates that the target strength was achieved in both castables. In conventional concrete CC0, the strength after drying at a temperature of 110 • C reached 45.9 MPa but dropped nearly by half (25.6 MPa) after treatment at 1000 • C. This phenomenon can be linked to the literature, which suggests that conventional concrete dehydrates up to 400 • C [30] and starts forming the C 12 A 7 cement mineral from amorphous dehydrated calcium aluminate to 900 • C [31]. Figure 2b illustrates this trend-the CC0 strength drops to 35.8 MPa after 400 • C. At 600 • C and 800 • C, the tests demonstrate no significant decrease in strength.…”

Section: Materials Propertiesmentioning

confidence: 71%

Bond Behavior of Stainless-Steel and Ordinary Reinforcement Bars in Refractory Castables under Elevated Temperatures

Plioplys,

Kudžma,

Sokolov

et al. 2023

J. Compos. Sci.

View full text Add to dashboard Cite

Refractory castables, i.e., refractory aggregates and ultra-fine particle mixtures with calcium aluminate cement (CAC) and deflocculants, were created 40 years ago for the metallurgy and petrochemical industries. These materials demonstrate outstanding performance even over 1000 °C. Typically, they have no structural reinforcement, resisting compression stresses because of the combination of temperature and mechanical loads. This study is a part of the research project that develops high-temperature resistance composite material suitable for fire and explosion protection of building structures. However, this application is impossible without structural reinforcement, and the bond performance problem becomes essential under high temperatures. This experimental work conducts pull-out tests of austenitic stainless 304 steel bars and typical structural S500 steel bars embedded in refractory castables after high-temperature treatments. This study includes plain and ribbed bars and considers two castable materials designed with 25 wt% CAC content for 50 MPa compressive strength after drying (typical design) and 100 MPa strength (modified with 2.5 wt% microsilica). This test program includes 115 samples for pull-out tests and 88 specimens for compression. As expected, the tests demonstrated the plain bars’ inability to resist the bond stresses already at 400 °C; on the contrary, ribbed bars, even made of structural steel, could ensure a mechanical bond with cement matrix up to 1000 °C. However, only stainless steel bars formed a reliable bond with the high-performance castable, determining a promising object for high-temperature applications. Still, the scatter of the test results did not ensure a reliable bonding model. In addition, the castable strength might not be optimal to ensure maximum bond performance. Thus, the test results clarified the research objectives for further developing the reinforced composite.

show abstract

Section: Materials Propertiesmentioning

confidence: 71%