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采用等体积置换法,将4目(4.75 mm)、40目(0.425 mm)两种粒径橡胶微粒分别按10%、20%、30%取代细骨料配制橡胶混凝土,并进行单轴受压及四点弯曲荷载作用下变形性能试验,研究橡胶微粒粒径、掺量对混凝土压弯性能的影响。试验结果表明:橡胶混凝土的单轴抗压强度及弹性模量较基准混凝土均有大幅度的降低,但变形能力明显增加,当掺量为30%时,峰值应变可达到基准混凝土的1.66倍;弯曲荷载作用下,试件极限挠度呈明显的增长,抗折强度随掺量的增加逐渐降低。表明橡胶微粒降低混凝土强度,但可显著提高其变形性能。
The equal volume displacement method was used to prepare rubber concrete with 10%, 20% and 30% of 4-particle (4.75 mm) and 40-mesh (0.425 mm) And four-point bending test of the deformation under the action of rubber particle size, dosage of concrete bending performance. The test results show that the uniaxial compressive strength and elastic modulus of rubber concrete decrease greatly compared with that of standard concrete, but the deformation capacity increases obviously. When the content of rubber is 30%, the peak strain can reach 1.66 times of that of standard concrete. Under the bending load, the ultimate deflection of the specimen shows a significant increase, the flexural strength decreases with the increase of the dosage. Rubber particles reduce the strength of concrete, but can significantly improve the deformation performance.