关键词: 橡胶改性;橡胶混凝土;粘接强度;抗压强度

Abstract: Based on the purpose of improving the mechanical properties of rubber-cement matrix, the rubber was modified by oxidation and urea, and the micro-macroscopic test techniques such as water contact angle, infrared spectrum, adhesive strength, and compressive strength and impact strength were used to investigate the properties of the modified rubber cement matrix.The results show that after the rubber is oxidized and urea-modified, a large amount of hydrophilic groups such as carbonyl and amide groups are introduced on the surface of the rubber, which change the rubber surface from hydrophobic to hydrophilic.So the interface action between the rubber and cement matrix is greatly increased, and the bonding strength between rubber and cement paste is increased by 33.4%.The rubber modification has definite effect in reducing the rubber cement matrix material compressive strength reduction, but this effect is more prominent in the rubber concrete than in the rubber mortar.When the rubber content is 30% or less of fine aggregate, the compressive strength of the modified rubber concrete can reach above 30 MPa, which can meet the requirements of medium strength concrete.

Key words: rubber modification;rubber-concrete;bonding strength;compressive strength