AU2020104280A4

AU2020104280A4 - Method of preparation of paver block incorporation of rubber waste

Info

Publication number: AU2020104280A4
Application number: AU2020104280A
Authority: AU
Inventors: Sandeep Chaudhary; Trilok Gupta; Ravi Kumar Sharma; Salman Siddique
Original assignee: College of Technology and Engineering Maharana Pratap University of Agriculture and Technology Mpuat Udaipur
Current assignee: College of Technology and Engineering Maharana Pratap University of Agriculture and Technology Mpuat Udaipur
Priority date: 2020-12-23
Filing date: 2020-12-23
Publication date: 2021-03-11
Anticipated expiration: 2028-12-23

Abstract

COMPOSITION FOR PREPARATION OF PAVER BLOCK UTILIZING RUBBER WASTE The present invention relates to a method of preparation of paver block utilizing rubber waste. The object of the proposed invention is to utilize waste tyre material and replacing the fine aggregate by waste tyre rubber ash (in powder form) and rubber fibers (in shredded form). The composition for preparation of sustainable rubcrete paver blocks comprises of cement (15.83%, 365 kg), fine aggregate (26.50%, 611 kg), coarse aggregate (48.79%, 1125 kg), waste rubber ash (1.69%, 39 kg), waste rubber fibers (1.34%, 31 kg), water (5.55%, 128 kg) and super plasticizer (0.30%, 7 kg) for production of one cubic meter concrete. Proposed paver blocks have unique feature of high energy absorption capacity, better abrasion resistance, and less water absorption. Following invention is described in detail with the help of Figure 1 of sheet 1 showing schematic presentation with dimensions of the proposed sustainable paver block. 1/3 60 50 40 N 30 20 10 0 1 Figure 1 7000 6000 5000 4000 3000 2000 1000 1 Figure 2

Description

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METHOD OF PREPARATION OF PAVER BLOCK INCORPORATION OF RUBBER WASTE

Technical field of invention:

[001] Present invention in general relates to the field of civil engineering and more particularly to a composition for preparation of sustainable paver block by utilizing waste tyre rubber ash and rubber fibers.

Background of the invention:

[002] The rapid rate of urbanization has resulted in increased environmental issues including disposal of discarded rubber tires. Many studies have been conducted in the past two decades to find and provide appropriate solutions to recycling and utilization of waste rubber tires. Another significant effect of urbanization is the increased demand for building materials especially concrete. The production of concrete consumes vast amount of natural resources causing serious environmental and ecological changes.

[003] Disposal and accumulation of discarded tyres of vehicles is another huge problem in the existing scenario. Destroying and disposal of these used tyres in environment lead to emission of dangerous gases in the course of incineration, decreased fertility of land and water percolation. Thus there is need for a good alternative choice to minimize the adverse impact of excessive sand mining on the environment and environment effective approach for disposal of discarded tyres of vehicles.

[004] For satisfying the requirement various attempts are made for providing various means for incorporation of waste rubber tires in various form such as ash, crumb and fiber have significant effect on mechanical, durability and ductility properties of concrete for making concrete paver blocks and therefore few of them are discussed below.

[005] US1629487A discloses process of making paving blocks and slabs made of rubber compound, US1728991A discloses paving block and slab made of rubber compound, US9382160B2 discloses the development of waste crumb rubber augmented masonry blocks, EP2789593A2 discloses concrete screed with recycled rubber from discarded tyres,

EP1092520A1 discloses process for recycling of tyres, rubber or elastomeric scrap and thermoplastic scrap of any kind, US9079347B2 discloses paving block formed of rubber crumb and a method of manufacturing the same, US1728990A discloses rubber composition or compound for the manufacture of paving blocks, slabs, and the like.

[006] Consequently, none of method is available in prior art utilizing waste rubber tyres in ash and fibers form as fine aggregate replacement in concrete paver blocks. And, there is a vital need of eco-efficient sustainable material which can overcome the adverse issues related with extraction of excessive sand mining by reducing its consumption and disposal and accumulation problem related with waste rubber tyres.

[007] Thus the proposal of mixing of waste tyre in form of rubber ash and rubber fibers in concrete (rubcrete) as fine aggregate replacement will become good alternative choice to minimize the adverse impact of excessive sand mining on the environment and environment effective approach for disposal of discarded tyres of vehicles. Hence, the present invention provides a method of preparation of paver block utilizing waste rubber tyres in ash and fibers form.

Object of the invention:

[008] Primary object of the present invention is to provide a composition and method for '0 preparation of sustainable paver block by utilizing waste tyre rubber ash and rubber fibers.

[009] Another object of the present invention is to minimize the consumption of fine aggregate by replacing it with waste tyre material (rubber ash and rubber fibers).

[0010] Yet another object of the present invention is to provide a paver blocks having an improved abrasion resistance and energy absorption capacity.

[0011] Other objects, features and advantages will become apparent from detail description and appended claims to those skilled in art.

Summary of the invention:

[0012] Accordingly following invention provides a composition and method for preparation of paver block utilizing rubber waste. The proposed method provides a sustainable paver block by partially replacing the fine aggregate with waste rubber ash (in powder form) and rubber fibers (in shredded form). The composition for preparation of sustainable rubber concrete paver blocks comprises of cement (15.83%, 365 kg), fine aggregate (26.50%, 611 kg), coarse aggregate (48.79%, 1125 kg), waste rubber ash (1.69%, 39 kg), waste rubber fibers (1.34%, 31 kg), water (5.55%, 128 kg) and superplasticizer (0.30%, 7 kg) for production of one cubic meter concrete. Freshly prepared mix concrete is poured in paver block molds and vibrates on table vibrating machine. After vibration, the paver blocks mould are kept as it is for 24 hours at room temperature and then de-moulded for 28 days of standard water curing. The paver blocks are tested after 28 days of standard curing.

Brief description of drawing:

[0013] This invention is described by way of example with reference to the following drawing where,

'0 [0014] Figure 1 of sheet 1 shows graphical representation of the compressive strength of conventional concrete paver block and paver block with waste tyre rubber ash and rubber fibers as partial replacement offine aggregate. Where, 1 denotes replacement level of fine aggregate by waste tyre rubber ash and rubber fibers, 2 denotes compressive strength (N/mm2).

[0015] Figure 2 of sheet 1 shows graphical representation of the energy absorption capacity value at first crack of conventional concrete paver block and paver block with waste tyre rubber ash and rubber fibers as partial replacement offine aggregate. Where, 1 denotes replacement level of fine aggregate by waste tyre rubber ash and rubber fibers, 3 denotes energy absorption capacity at first crack (N.m).

[0016] Figure 3 of sheet 2 shows graphical representation of the energy absorption capacity value at ultimate crack of conventional concrete paver block and paver block with waste tyre rubber ash and rubber fibers as partial replacement offine aggregate. Where, 1 denotes replacement level of fine aggregate by waste tyre rubber ash and rubber fibers, 4 denotes energy absorption capacity at ultimate crack (N.m).

[0017] Figure 4 of sheet 2 shows graphical representation of the water absorption value of conventional concrete paver block and paver block with waste tyre rubber ash and rubber fibers as partial replacement offine aggregate. Where, 1 denotes replacement level of fine aggregate by waste tyre rubber ash and rubber fibers, 5 denotes water absorption (%).

[0018] Figure 5 of sheet 3 shows graphical representation of the abrasion resistance in term of depth of wear (mm) of conventional concrete paver block and paver block with waste tyre rubber ash and rubber fibers as partial replacement offine aggregate. Where, 1 denotes replacement level of fine aggregate by waste tyre rubber ash and rubber fibers, '0 6 denotes abrasion resistance in terms of loss of thickness (mm).

[0019] In order that the manner in which the above-cited and other advantages and objects of the invention are obtained, a more particular description of the invention briefly described above will be referred, which are illustrated in the appended drawing. Understanding that these drawing depict only typical embodiment of the invention and therefore not to be considered limiting on its scope, the invention will be described with additional specificity and details through the use of the accompanying drawing.

Detailed description of the invention:

[0020] The present invention relates to a composition and method for preparation of paver block utilizing rubber waste. The proposed invention provides a sustainable paver block utilizing waste tyre rubber ash and fibers as partial replacement of fine aggregate.

[0021] In the proposed method of preparation of paver block cement, fine aggregates, coarse aggregates, water and waste tyre rubber ash and rubber fibers utilized to produce sustainable rubber concrete mixes. The concrete mix design of M40 grade is made as per the guidelines of Indian standards IS 10262: 2009 and IS 456: 2000. Proportions of various ingredients are shown in Table 1.

[0022] The composition for preparation of sustainable rubber concrete paver blocks comprises of cement (15.83%, 365 kg), fine aggregate (26.50%, 611 kg), coarse aggregate (48.79%, 1125 kg), waste rubber ash (1.69%, 39 kg), waste rubber fibers (1.34%, 31 kg), water (5.55%, 128 kg) and super plasticizer (0.30%, 7 kg) for production of one cubic meter concrete. Proportions of various ingredients are shown in Table 1.

[0023] Table 1: Proportion of material to produce one cubic meter of paver block. Type of Cement Fine Coarse Waste Waste Water Super paver block (Kg) aggregate aggregate rubber rubber (Kg) plastici (Kg) (Kg) ash fibers zer (Kg) Rubcrete paver block 364 688 1124.4 39.5 0 127.4 2% (10% rubber ash only) Rubcrete 364 paver block (10% rubber 650 1124.4 39.5 15.9 127.4 2% ash and 5% rubber fibers) Rubcrete 364 paver block (10% rubber 611 1124.4 39.5 31.6 127.4 2% ash and 10% rubber fibers) Rubcrete 364 paver block (10% rubber 573 1124.4 39.5 47.5 127.4 2% ash and 15% rubber fibers) Rubcrete 364 paver block (10% rubber 535 1124.4 39.5 63.5 127.4 2% ash and 20% rubber fibers) Rubcrete 364 paver block 497 1124.4 39.5 80.1 127.4 2 (10% rubber 25 ash and % rubber fibers)

[0024] In the preferred embodiment, a rubber concrete mix is prepared using all the above ingredients. Further in the process freshly prepared mix is poured in paver block moulds and vibrates on table vibrating machine. After vibration, the paver blocks mould are kept as it is for 24 hours at room temperature and then de-moulded for 28 days of standard water curing. The paver blocks are tested after 28 days of standard curing. According to Indian Standard IS 15658:2006, paver blocks are tested for compressive strength, energy absorption capacity at first crack, energy absorption capacity at ultimate crack, water absorption and abrasion resistance.

[0025] Compressive strength of the proposed sustainable paver block is decreased for all replacement level however as per IS 456:2000 and IS 15658:2006 the acceptance value of compressive strength is achieved at 10% waste tyre rubber ash and 10% waste tyre rubber fibers of replacement of fine aggregate (Figure 2). Energy absorption capacity of paver blocks at first crack and ultimate cracks is much higher than conventional concrete paver blocks (Figure 3-4). The value of water absorption is less than 6% as per IS 15658:2006 for all replacement levels (Figure 5). At the same replacement level abrasion resistance of sustainable paver block is within the permissible limit as per Indian Standard IS 1237: 2012 (Figure 6). The test results of sustainable paver block at 10% waste tyre rubber ash and 10% '0 waste tyre rubber fibers are shown in Table 2.

[0026] Table 2: Test results of sustainable rubcrete paver block with 10% waste tyre rubber ash and 10% waste tyre rubber fibers.

Test Result Requirement as per Indian standards Compressive strength 46.07 MPa 30 MPa - 55MPa (IS (Figure 2) 15658:2006) Energy absorption capacity at 2344 N.m first crack (Figure 6) Energy absorption capacity at 2741 N.m ultimate crack (Figure 7) Water absorption 0.86% 6% (IS 15658:2006) (Figure 4) Abrasion resistance 1.12mm 2 mm (IS 1237:2012) (Figure 3)

[0027] In the preferred embodiment it is confirmed that the 20% replacement of fine aggregate by waste tyre (10% waste tyre rubber ash and 10% waste tyre rubber fibers ) in paver blocks for medium traffic roads can be used without much affecting the compressive strength and where 10% waste tyre rubber ash and 20% waste tyre rubber ash can be used in paver blocks for light traffic roads like as domestic drives and public gardens.

[0028] Additional advantages and modification will readily occur to those skilled in art. Therefore, the invention in its broader aspect is not limited to specific details and representative embodiments shown and described herein. Accordingly various modifications may be made without departing from the spirit or scope of the general invention concept as defined by the appended claims and their equivalents.

Editorial Note 2020104280 There is 1 page of Claims only.

Claims

THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS:

1. A composition and method for preparation of paver block utilizing rubber waste consisting of cement (15.83%, 365 kg), fine aggregate (26.50%, 611 kg), coarse aggregate (48.79%, 1125 kg), waste rubber ash (1.69%, 39 kg), waste rubber fibers (1.34%, 31 kg), water (5.55%, 128 kg) and super plasticizer (0.30%, 7 kg) for production of one cubic meter concrete.

2. The composition and method for preparation of paver block utilizing rubber waste as claimed in claim 1 wherein said method comprising of following steps;

a) a rubber concrete mix is prepared using all said ingredients; b) further in the process freshly prepared mix is poured in paver block moulds and vibrates on table vibrating machine; c) after vibration, the paver blocks mould are kept as it is for 24 hours at room temperature; d) and then de-moulded for 28 days of standard water curing.