Waste Ceramic Recycled Coarse Aggregate Concrete Design Research

With the development of economic and engineering construction, on the one hand, wasteceramic increase every year, which brings serious pollution to environment. On the otherhand, some places are short of sand and stone resource. These problems cause people’sattention. The study found that the ceramic has low strength, high pore ratio, large waterabsorption rate, needle flake. The glaze side reduced ceramic aggregate-cement stoneinterface transition zone bonding performance. In view of above key problems, this paperrelying on the advantage of jiangxi province science and technology innovation team project"waste ceramic utilization of key technology and dustrialization research"(S2010JX00800),carry out waste ceramic recycled coarse aggregate concrete optimization design research. Themain work and results are introduced as follows:1. Waste ceramic recycled coarse aggregate basic characteristic research show that therecycled coarse aggregate gradation is reasonable, in the rubble (5~25mm) grading range.In the grading level, using waste ceramic development of recycled coarse aggregate is feasible.Recycled coarse aggregate crushing index is higher than the original macadam aggregate.Recycled coarse aggregate voids and bibulous rate are higher than the original macadamaggregate, and the apparent density and stacking density are smaller than the original rockcoarse aggregate.2. To waste ceramic recycled coarse aggregate basic characteristics, diluting silanecoupling agent KH–550and DS-302concrete interface interface agent to soak recycledcoarse aggregate to aggrandize aggregate. Compare recycled coarse aggregate concrete28days’ compressive strength. The results show that the silane coupling agent KH-550processing regeneration concrete compressive strength is45%higher than untreatedregeneration concrete and43%higher than DS-302interface treatment agent concrete. ofSilane coupling agent KH–550is selected for ceramic recycled coarse aggregate surfacestrengthening treatment.3. For ceramic aggregate-cement stone bad interface transition zone bondingperformance, from the solution concentration and soak time to control, use silane couplingagent KH-550to soak ceramic recycled aggregate to make ceramic aggregate-cementmortar cube bending test. The test results show that when the silane coupling agent KH-550solution concentration was4%, soak time for100minutes, cube bending strength is highest,namely ceramic aggregate-cement stone interface transition zone bonding performance isbest, as surface strengthening technology.4. Process ceramic aggregate according strengthening technology, make C25concretewith different substitution rate (0%,15%,30%,45%,60%,100%), test compressive and splitting tensile strength, the conclusion show that recycled concrete compressive and splittingtensile strength decreased with the increase of the ceramic aggregate replacement ratio. Whenreplace rate is60%, the recycled concrete compressive and splitting tensile strength isrespectively increased by18.9%and7.98%than original rock concrete, as the optimumreplace rate. The optimal replace rate is60%is drawn.5. Make concrete with processed ceramic coarse aggregate and optimal replace rate, testits bending, prismoid axial compression, elastic modulus and resistance to chloride ionpenetration and ceramic aggregate-cement net pulp stereoscopic microscope microscopicmechanism analysis. The results of the study show that the recycled concrete bending andaxial compressive strength respectively increase18.9%and7.98%than original stoneconcrete. Six hours’ electric flux of processed ceramic coarse aggregate concrete increased18%than original stone concrete, namely the resistance of chloride ion penetration ability islower than original stone concrete and1.13times higher than no processing regenerationconcrete. Stereoscopic microscope microscopic mechanism analysis shows that, the surfacestrengthening technology makes ceramic aggregate-cement net pulp interface transition zonemore flat and compact, which increases interface transition zone bond properties. Furtherstudy was proposed, which is that adding mineral admixture on the basis of surfacestrengthening technology can be equipped higher level ceramic recycled coarse aggregateconcrete.