Mussel Inspired Modification of Rubber Crumbs for Improved Interfacial Adhesion in Rubber Cement Mortar

Interface bonding is the key technical problems of waste rubber in engineering application. Studies show that, with the increase of unmodified rubber particles dosage, the cement mortar 28 d compressive and flexural strength significantly reduce; when NaOH modified rubber particle content is less than or equal to 5%, it can reduce the compressive flexural strength reduction; The PVA modified rubber particles had no beneficial effect on the strength; rubber particles modified by silane coupling agent KH560, can greatly improve the rubber cement mortar 28 d compressive and flexural strength; the modifier mechanism is studied by scanning electron microscopy (SEM).

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Influence of Rubber Powder Dosage on Performance of Cement Mortar

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.361-363.1532 ◽

2013 ◽

Vol 361-363 ◽

pp. 1532-1535 ◽

Cited By ~ 1

Author(s):

Yan Cong Zhang ◽

Ling Ling Gao

Keyword(s):

Compressive Strength ◽

Flexural Strength ◽

Linear Growth ◽

Cement Mortar ◽

Growth Trend ◽

Cement Ratio ◽

Rubber Powder ◽

Water Cement Ratio ◽

Fine Aggregates ◽

Rubber Cement

A number of rubber cement dosage specimens that rubber powder dosage different were obtained using same cement, water and fine aggregates, by adjusting the dosage of rubber powder. Then it was used to research the influence of rubber powder dosage on performance of cement mortar by measuring its liquidity, strength and toughness. The results show that: when water-cement ratio was equal and rubber powder replacing the same volume sand, the fluidity of cement mortar almost linear increased with rubber powder dosage increasing. With dosage of rubber powder increasing, compressive strength and flexural strength reduced, but toughness linear growth trend when dosage of rubber powder less 30%.

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Effect of Modified Rubber Particles Mixing Amount on Properties of Cement Mortar

Advances in Civil Engineering ◽

10.1155/2017/8643839 ◽

2017 ◽

Vol 2017 ◽

pp. 1-6 ◽

Cited By ~ 4

Author(s):

Gang Xue ◽

Mei-ling Cao

Keyword(s):

Compressive Strength ◽

Flexural Strength ◽

Cement Mortar ◽

Impact Resistance ◽

Drying Shrinkage ◽

Crumb Rubber ◽

Rubber Particles ◽

Rubber Cement ◽

Optimal Mixing ◽

Rubber Aggregates

The crumb rubber cement mortar is prepared by the crumb rubber aggregates in 60 mesh which are modified by 1% polyvinyl alcohol (PVA) solution. Some mechanical properties of cement mortar with different crumb rubber aggregate amounts are researched including compressive strength, flexural strength, the ratio of compressive strength to flexural strength, impact resistance, and dry contraction percentage. In our tests, we consider six kinds of the rubber contents, 0%, 7.5%, 15%, 19%, 22.5%, and 30%, respectively. The optimal mixing amount of crumb rubber is determined by measuring three indices, the ratio of compressive strength to flexural strength, impact resistance, and dry contraction percentage. It is shown by test that the ratio of compressive strength to flexural strength is the smallest when the mixing amount of rubber is 19%; meanwhile high impact resistance and rational drying shrinkage are observed. The optimal mixing amount of the rubber particles is 19% determined by this test.

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Effect of Silica Fume and Synthetic Fibre towards the Compressive Strength of Modified Crumb Rubber Cement Mortar

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.411.135 ◽

2021 ◽

Vol 411 ◽

pp. 135-142

Author(s):

Mohamad Raduan Bin Kabit ◽

Syed Syabil Rahmat Syed Sarkawi ◽

MD Abdul Mannan ◽

Johnson Olufemi Adebayo

Keyword(s):

Compressive Strength ◽

Silica Fume ◽

Cement Mortar ◽

Past Research ◽

Crumb Rubber ◽

Synthetic Fiber ◽

Shrinkage Cracking ◽

Content Ratio ◽

Rubber Cement ◽

Mechanical Strengths

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 the modified mortar mix should be further investigated as the present modified crumb rubber mix has lower workability. It is envisaged that the modified crumb rubber mortar mix has a sound potential to mitigate shrinkage cracking in cement mortar.

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Morphological behavior of compatibilized ternary blends prepared by mechanical mixing

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100151830 ◽

1993 ◽

Vol 51 ◽

pp. 1200-1201

Author(s):

S.D. Smith ◽

R.J. Spontak ◽

D.H. Melik ◽

S.M. Buehler ◽

K.M. Kerr ◽

...

Keyword(s):

Interfacial Adhesion ◽

Diblock Copolymers ◽

Ternary Blends ◽

Mechanical Mixing ◽

Design Considerations ◽

Covalently Bonded ◽

Homopolymer Blends ◽

Emulsifying Agent ◽

Surface Active ◽

Low Entropy

When blended together, homopolymers A and B will normally macrophase-separate into relatively large (≫1 μm) A-rich and B-rich phases, between which exists poor interfacial adhesion, due to a low entropy of mixing. The size scale of phase separation in such a blend can be reduced, and the extent of interfacial A-B contact and entanglement enhanced, via addition of an emulsifying agent such as an AB diblock copolymer. Diblock copolymers consist of a long sequence of A monomers covalently bonded to a long sequence of B monomers. These materials are surface-active and decrease interfacial tension between immiscible phases much in the same way as do small-molecule surfactants. Previous studies have clearly demonstrated the utility of block copolymers in compatibilizing homopolymer blends and enhancing blend properties such as fracture toughness. It is now recognized that optimization of emulsified ternary blends relies upon design considerations such as sufficient block penetration into a macrophase (to avoid block slip) and prevention of a copolymer multilayer at the A-B interface (to avoid intralayer failure).

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