Research On Rubber Interlocking-dense Cement Concrete

In view of the environmental pressure and resources wasting which the increasing wasterubbe brings, combined with the advantages of interlocking-dense cement concrete coarseaggregate skeleton structure, this research proposes the rubber interlocking-dense cementconcrete. The sand is replaced by rubber with equal volume. In order to overcome the sharpattenuation of strength in ordinary cement concrete because of the mixed rubber. The strengthand toughness of rubber interlocking dense cement concrete is analysed from the rubbersurface modification, rubber content, fiber content, sand ratio and water cement ratio, thenthe concrete mixture is acquired, which provides the reference for the popularization andapplication of rubber interloching-dense cement concrete.Through macro hydrophilic test and scanning electron microscope (SEM) test, resultsshow that the surface microstructure of rubber is improced through modification processing,hydrophilic is enhanced. With SEM analysis of cement paste and rubber (modified andunmodified) or fiber under different ages, SEM shows that modified rubber has strongerinterface bonding condition with cement than unmodified rubber, fiber and cement bondtightly. Analysising of different factors’ impact on the rubber interlockin-dense cementconcrete strength and toughness, the modified rubber concrete is better than unmodifiedrubber concrete. With rubber content increasing, compressive strength, flexural strength andstrain energy density is parabolic linear tendency, flexural-tensile strain reaches the maximumat7days. With fiber content increasing, compressive strength, flexural strength andflexural-tensile strain shows a parabolic variation, the change trend of strain energy density isdifferent. With the increase of sand ratio, and water cement ratio strength, flexural-tensilestrain and strain energy density presents a parabolic style. Through the ANOVA, strength andtoughness test analysis, the final mix proportion of concrete is determined as follows: rubbervolume content is15%, fiber volume content is0.8%, sand ratio and water cement ratio is0.32and0.38. Modified rubber is better than the unmodified rubber. Pavement performancetest results show that rubber interlocking-dense cement concrete strength can meet therequirement of medium traffic level, and the abrasive resistance, dry shrinkage, frostresistance and fatigue resistance performance are better than ordinary cement concrete.