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Research on the Durability of Concrete Containing Scrap Rubber Powder

Author: TuNi
Tutor: WangBaoMin
School: Dalian University of Technology
Course: Materials Science
Keywords: Scrap Rubber Concrete Durability
CLC: TU528
Type: Master's thesis
Year: 2012
Downloads: 231
Quote: 0
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Abstract


Putting scrap rubber powders into cement concrete can improve a lot of properties, and also solve problem about a large number of waste rubber recycling. Experimental study on rubberized concrete will play a significant role in utilization resources, environmental protection and modified materials. Due to the relatively short history of rubberized concrete, the related experimental studies and theoretical analysis are not very mature, especially the performance in durability, which seriously hindered the widespread application of rubberized concrete.The previous results of our research group show that putting scrap rubber powders into cement concrete can greatly enhance frost resistance. The effect of rubber powders is equal to adding air-entraining mixture, under the condition of right size and quantity. This topic which based on the previous studies continue to research other properties in durability(include chloride ion permeability resistance, alkali-aggregate reaction^abrasion resistance^sulphate attack resistance^freezing resistance under steam curing).Improving the durability can provide theoretical basis to widespread application of rubberized concrete.The results of this paper are:(1) This paper studies the chloride ions penetration resistance property of rubberized concrete based on RCM and NEL method, the variation is almost identical. The chloride ion permeability resistance of rubberized concrete decreased with the increasing of W/C; decreased when the contents of rubber powder get higher than lOkg/m; Among three different rubber particles of the sizes of80mesh, lOOmesh and120mesh, the120mesh has the best effect on chloride ion permeability resistance.(2) The influence of scrap rubber powder on alkali-aggregate reaction is studied by the glass mortar bar method. The results indicate that the incorporation of scrap rubber powder could suppress the sample’s expansion caused by alkali-aggregate reaction, the inhibition effect reaches ideal degree when the rubber mixing content is2.5%. Among three different rubber particles of the sizes of80-mesh,100-mesh and120-mesh, the120-mesh has the best inhibition effect on alkali-aggregate reaction.(3) The abrasion resistance of rubberized concrete is improved remarkly, and decreased with the increasing of W/C. With the increase of rubber powder, the abrasion resistance tends to decrease firstly and then increase. Among three different rubber particles of the sizes of 80-mesh,100-mesh and120-mesh, the100-mesh has the best effect on abrasion resistance. The outcome of the study indicated there were not necessary relation between compressive strength and abrasion resistance.(4) The influence of sulphate attack resistance on rubberized concrete is studied by wet-dry cycling method. Sulphate attack resistance of rubberized concrete is improved at the early stage and compressive strength is weakened sharply at the late stage. With the increase of rubber powder, resistance sulphate attack would be increased. Among three different rubber particles of the sizes of100-mesh,120-mesh and150-mesh, the150-mesh has the best effect on sulphate attack resistance.(5)The rubberized concrete demonstrates good adaptability on steam curing, frost resistance had no obvious decline. The bubble test shows steam curing has no effect on air content.

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CLC: > Industrial Technology > Building Science > Building Materials > Non-metallic materials > Concrete and concrete products
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