摘要:
通过净浆、砂浆和混凝土3 个层面的试验研究, 探讨了橡胶混凝土的抗裂性能和弯曲变形特性。根据圆环试件的开裂时间, 对3 种水灰比( 0. 3, 0. 4, 0. 5) 水泥净浆中掺入不同体积含量橡胶颗粒( 10%, 15%, 20%,30% , 50%) 后的开裂敏感性进行了对比分析。结果表明, 在水泥净浆中掺入橡胶颗粒可以显著延缓试件的开裂时间, 提高抗裂性, 延缓时间随着橡胶颗粒掺量的增加和水灰比的增大而延长。弯曲试验考察了4 个橡胶颗粒体积含量( 8%, 16%, 21. 4%, 32%) 砂浆试件和3 个橡胶颗粒体积含量( 10%, 12. 5%, 15%) 混凝土试件的弯曲变形性能。结果表明, 含橡胶颗粒的砂浆试件和混凝土试件在弯曲过程中会产生明显的塑性变形, 试件不会在承受最大荷载时产生脆性断裂, 而是经过较大的塑性变形后延性破坏。与基准试件相比, 砂浆试件和混凝土试件破坏时的极限变形值均有大幅度提高。
Abstract:
The cracking- r esistance and flexural propert y of the r ubberized concr ete wer e investigated based on thetests of paste, morta r and concrete specimens. The cr acking- resistance was eva luated based on the cracking time ofa ring specimen, which was prepared by incor porating waste tir e rubber particles in the cement paste, and threediffer ent water-cement rat ios ( 0. 3, 0. 4, 0. 5) and five different r ubber volume fractions( 10%, 15%, 20%, 30%,50%) were used. T he r esult s show that the addition of rubber par ticles dela ys the cracking time and improves thecr acking- r esistance of the specimens and the delayed t ime increases with the incr ease of t he water2 cement r atio andthe volume fraction of rubber particles. T he flexural propert ies wer e evaluated based on the bending tests of bothmort ar and concrete, four rubber volume fr actions ( 8%, 16%, 21. 4%, 32%) were used for mor tar and threerubber fractions ( 10%, 12. 5%, 15%) for concrete. The results show t hat the r ubberized mor tar and concr et e specimen exhibited ductile fa ilure and underwent signif icant deformation befor e fr actur e. The ultimate deformat ions ofboth mortar and concrete specimen increase substant ially compar ed to the contr ol specimens.
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