Influence of Rubber Size on Properties of Crumb Rubber Mortars (original) (raw)
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Construction and Building Materials, 2010
This study presents the results of an experimental investigation to study the effects of partial replacement of fine aggregate with scrap tire-rubber in self-consolidating mortar (SCM). Fresh and hardened properties of SCMs produced at five different replacement ratios of scrap rubber with sand, 0%, 10%, 20%, 30%, 40% and 50% (by weight of sand), were compared to those of without rubber. Mini slump flow and mini V-box flow time values were determined experimentally in fresh SCM. Moreover, drying shrinkage, apparent porosity, water absorption by weight, compressive and flexural strength, and dynamic modulus of elasticity were measured. While comparing the control SCMs, the partial replacement of scrap rubber with sand resulted in degradation in fresh and hardened properties. On the other hand, the addition of scrap rubber, from 10% to 40%, had a beneficial effect in decreasing the drying shrinkage of SCMs produced at low w/p (water-powder) ratios.
Defect and Diffusion Forum, 2021
Cracking is very common problem in cement mortar. Many past research has explored the prospect of using crumb rubber (CR) to overcome this issue. Different sizes of CR have been tested to measure its effect on the pore structure and mechanical strengths of cement mortar. Hence, this study has further modified the crumb rubber mortar mix by adding silica fume and synthetic fiber to improve its mechanical properties. The experimental results suggested that the optimum silica fume replacement of cement content was 5%. Hence, for the subsequent experiment with a fixed 5%silica fume replacement, the highest compressive strength of 26 MPa was achieved with 5% crumb rubber replacement. Finally, additional 0.1% of synthetic fiber added the modified crumb rubber mix to reduce the mix brittleness has produced a desirable compressive strength close to the control specimen which was significantly higher than the minimum threshold required by the standard. However, the water content ratio for th...
Improved Resistance to Cracking of a Cement Mortar through the Incorporation of Crumb Rubber
Journal of Physical Science and Application
Within a context of sustainable development, innovative processes for various applications to recycle rubber are put in place to make aggregates or crumb rubber. These uses include sports floor coverings, to manufacture of sealants, sound absorbing walls, to make roads, as an alternative fuel in cement kilns, etc. In this study, the addition of crumb rubber to mortar was investigated through optical and mechanical tests. The results showed that the incorporation of crumb rubber from used tires into mortar produced a better resistance to shrinkage cracking, but a compressive strength/tensile is reduced. This feature could lend itself to making playgrounds and sports grounds more absorbing and flexible, which would allow a more significant fall to be withstood without injury and consequently enhance the safety of playgrounds.
Construction and Building Materials, 2012
In this study, the expansion under water and the drying shrinkage of rubberized concrete used in pre-cast lightweight panels are investigated. Two sizes of crumb rubber are used: No. 6 (passing sieve No. 6) and No. 26 (passing sieve No. 26). Four experiments are carried out: absorption, compression, expansion and shrinkage. The size of the crumb rubber affected the properties of crumb rubber in different ways. Rubberized concretes with large sized crumb rubber (6CR) appear to have higher absorption than those with small sized crumb rubber (26CR). In the case of strength, both crumb rubbers clearly cause the compressive strength to decrease. The 6CR also exhibits higher expansion and lower shrinkage than the 26CR. The crumb rubber's size and shape together with the non-polar effect are believed to play an important role on this phenomenon.
Effect on Water Retention of Different Mortar Mix with Different Percentage of Fine Crumb Rubber
Elsevier SSRN Series
Mortar is mixture of sand, binder and water content. The water content is very effective parameter of mortar which may change many properties of mortar especially strength and workability. The workability of mortar mix is important property while designing mortar mix. The compressive strength of mortar mix gets affected by workability of mortar and workability of mortar is depended on amount of water. The waste rubber is major issue now a days and waste rubber are obtained from tyres. These rubbers contribute the filing a large portion of landfills. As these waste materials are not easily decomposed, thus has created scopes for reusing and recycling waste rubber in various applications. Numerous researchers used this waste material in their research work on mortar and they partially replaced coarse and fine aggregate with tyre waste materials. They concluded that waste tyre rubber or crumb rubber may useful in mortar. In this research work, the fine aggregates are partially replaced by fine crumb rubber with 2.5% variation and compressive strength test and flow table test are performed in laboratory. In addition, the retention of water in mortar is also determined by water retention test apparatus fabricated in house. The water retention test apparatus works on principle of suction of water from mortar under gravity motion. The compressive strength test and water retention tests are performed for 1:3, 1:4, 1:5 and 1:6 mortar mix controlled specimen and mix specimen of partial replacement of fine aggregate by fine crumb rubber.
Effect of Particle Sizes on Mechanical Properties of Concrete Containing Crumb Rubber
Innovative Systems Design and Engineering, 2015
This paper investigates the mechanical properties of concrete containing different particle sizes of crumb rubber. This research have been conducted on 10% replacement of fine aggregates by three different particle sizes of crumb rubber which are 1 mm crumb rubber, 0.4-1 mm fine dust crumb rubber, and 0.2-0.6 mm powder crumb rubber. Laboratory tests include slump test, compressive test, flexural test, bulk density test, water absorption test, porosity test, and ultrasonic pulse velocity (UPV) test were conducted on the concrete mixes. All concrete specimens were tested at the age of 7, 14, 28, and 56 days. The results from laboratory testing on concrete specimens were analyzed. It was found that in the inclusion of crumb rubber into concrete, it will reduce the strength of concrete. The usage of greater particle sizes of crumb rubber which is 1 mm crumb rubber gives better strength of concrete compared to the usage of smaller particle sizes of crumb rubber which is 0.2-0.6 mm powder crumb rubber. Therefore, the rubberized concrete can absorb the impact energy and suitable usage in roads and highways construction such as road divider, road pavement, and others because it can absorb impact from vehicles load, disaster and others.
Characterization of Modified Crumb Rubber Concrete
International Journal of Sustainable Development and Planning, 2020
Concrete is a very important construction material used worldwide for the construction of bridges, buildings, dams, kerbs, patios, pools, roads, walkways and other civil engineering structures. The constituents of concrete are cement, coarse aggregate, fine aggregate and water. Efforts were made in this work to evaluate the suitability of crumb rubber as a partial substitute of sand in concrete mixes. This research evaluated the effects of partial substitution of sand with crumb rubber on the mechanical properties and microstructural formation of modified crumb rubber concrete. The control concrete sample and concrete samples with 1, 2, 3 and 4% sand content in the concrete substituted with crumb rubber were cured for 3, 7, 28, 90 and 120 days, respectively, and then tested. The laboratory experiments conducted on the concrete samples were workability, bulk density, compressive strength, tensile splitting strength, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Improvement in the strength and densification of the microstructure of the concrete samples occurred as the curing age increased from 3 to 7, 28, 90 and 120 days, respectively. This research further showed that marginal improvement in both the strength properties and microstructural formation of the modified crumb rubber concrete can be achieved by substituting 1% sand with crumb rubber.
Review on the characteristic properties of crumb rubber concrete
Cleaner Materials, 2024
The global scientific research circle and government agencies face a number of serious environmental challenges, one of which is the recycling of "End of Life Tires" (ELT). An estimation of one billion tires is expected to end their useful life annually, of which only roughly 50% are recycled at the moment, with the remainder ending up in landfills. Consequently, to solve this gap in the ELT's utilization rate, it is imperative to enhance the current application and furthermore create new applications for recycled tire materials. One of such areas that is currently being investigated is the introduction of waste tire into concrete as partial replacement of natural aggregates in concrete production. Despite its great prospects, it has drawbacks such as lack of proper bonding with the cement matrix and weak rubber intrinsic strength, which make it unsuitable for widespread usage as an aggregate. To get past this obstacle, numerous rubber treatment techniques that enhance the mechanical characteristics of rubber concrete remarkably as well as the bonding properties have been studied by researchers. The impact of rubber percentage replacement, rubber aggregate size and different treatment techniques on various mechanical characteristics of rubber concrete are examined in this review paper. But in order for the concrete industry to embrace it, the researchers need to devise a rubber treatment technique that can tackle the issues of high combustible and the harmful gases that are released from the rubber aggregates when they come in contact with fire.
Experimental Study of Crumb Rubber in Concrete
Crumb rubber is a material produced by shredding and commutating used tires. Waste tire dumping, disposal of these materials or burning these tires cause serious health and environmental problems. On the other side the traffic intensity also increasing day by day and thus bearing capacities also increased the long term goal of the work is to find a means to dispose of the crumb rubber in concrete and still provide a final product with good engineering properties. Due to the depletion of natural sand it is required to use other material than sand being used as the fine aggregate in concrete. The innovative use of the crumb rubber in concrete formulations as a sand replacement in range of 0%, 2.5%,5%,7.5% and 10 % by weight for M-25 grade cement (OPC). It will include an experimental review on the effects of CRM on compressive test and flexure test.
EXPERIMENTAL STUDY OF USE OF CRUMBED RUBBER IN CONCRETE
isara solutions, 2020
In Construction industry, concrete is mostly used in world-wise as construction materials and about 12.5 billion tons of natural resources are used to make the concrete. Many scientists and researchers are trying to find alternate construction materials, which are environmentally friendly and contribute towards sustainable development or green construction. Use of rubber as an alternate additive to the conventional concrete mix could be the huge step ahead. The quantity of rubber wastes is being generated rapidly day by day, so dramatically that it has ringed an alarm to the disposal problems as well as the harm environment could go through such huge non-biodegradable product. Hence, using scrap tyres crumb in concrete is a technical need and needed for mother nature; the modified crumb rubber concrete is considered a light- weight alternate to conventional concrete. The objective of this study is to determine the strength behavior of crumb rubber concrete which is in powder form.