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Long-term strength of rubberized concrete paving blocks

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What is rubberised concrete paving blocks(RCPB)

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Why we used rubber?

Road transportation engineering are producing ton of wastage fromscrap tyres.

Recycled waste tyre rubber is promosing material in constructionindustry due to its lightweight, elasticity, energy absorption, soundand heat insulating properties.

As a replacement material for fine and coarse aggregates. To utilize or make used of tire rubber instead of dumping or left

unattended. This is due to environmental concerns. This non-renewable resources will provide a breeding place for mosquitos,caused air pollution, odour and other harmful contamination.

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Fabricating of RCPB

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Testing Conducted

Compressive StrengthTest

Splitting tensile strength test

Flexural st

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Compressive strength test : To measure the compressive strength of the paving blocks (RCPB) Universal testing machine with a maximum capacity up to 3000kN.

Splitting tensile strength : A splitting tensile strength is established to derive material strength rather

than unit strength for CPB according to BS 6717: 2001 (BSI, 2001). It measures the ability to resist a shear force which is the tension generated, fo

instance, in the case of spalling. This leads also to a large breaking surface that can be inspected visually.

Flexural strength test : Flexural strength is preferred as an index of strength. Flexural (three point bending) strength, however, is not affected by paving uni

thickness. It seems to be a more suitable quality indicator due to bending test.

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Compressive Strength Test

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Splitting Tensile Strength Test

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Flexural Strength Test

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Correlation Graph

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Conclusions Finding shows that crumb rubber can be used as replacement of fine

aggregate but the quantity of usage should not exceed 20 percentbecause it did not show any significant change in compressive strengtbut slightly improved the flexural strength.

It was found that the block specimens tested remained intact afterfailure and did not shatter. This would be beneficial for traffickedroads.

Comparing the three curing regimes at long-term age, the air curedsamples gained slightly higher strength. Nevertheless, a high volumeof daily production of CPB makes natural weather curing moreeconomic and applicable.

A valuable relationship of long-term strength would produce benefitsfor both researchers and road designers.