Effect of Polymer Additives on the Microstructure and Mechanical Properties of Self-Leveling Rubberised Concrete

The materials based on concrete with an addition of rubber are well-known. The interaction between concrete components and rubber particles is in the majority cases insufficient. For this reason, different substances are introduced into concrete-rubber systems. The aim of this paper is to establish the influence of five different polymer additives, i.e., 1. an aqueous dispersion of a styrene-acrylic ester copolymer (silanised) (ASS), 2. water dispersion of styrene-acrylic copolymer (AS), 3. anionic copolymer of acrylic acid ester and styrene in the form of powder (AS.RDP), 4. water polymer dispersion produced from the vinyl acetate and ethylene monomers (EVA), 5. copolymer powder of vinyl acetate and ethylene (EVA.RDP)) on the properties of the self-leveling rubberised concrete. Scanning electron microscopy has allowed to establish the interaction between the cement paste and rubber aggregates. Moreover, the compressive strength and flexural strength of the studied materials were evaluated. The results indicate that the mechanical properties depend extensively on the type as well as the amount of the polymer additive introduced into the system.

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Comonomer Effect on the Thermal, Morphological and Mechanical Properties of Poly(ethylene-co-octene)/Poly(ethylene-co-vinyl acetate) Blends

Polymer Science Series A ◽

10.1134/s0965545x20060073 ◽

2020 ◽

Vol 62 (6) ◽

pp. 660-669

Author(s):

Al Mamun ◽

Rizwan Mahmood

Keyword(s):

Mechanical Properties ◽

Vinyl Acetate ◽

Poly Ethylene

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Coatings with recycled polyvinyl butyral on polyester and polyamide mono- and multifilament yarns

Journal of Coatings Technology and Research ◽

10.1007/s11998-020-00445-x ◽

2021 ◽

Author(s):

Rike Brendgen ◽

Carsten Graßmann ◽

Thomas Grethe ◽

Boris Mahltig ◽

Anne Schwarz-Pfeiffer

Keyword(s):

Mechanical Properties ◽

Chemical Resistance ◽

Crosslinking Agent ◽

Polyvinyl Butyral ◽

Polymer Dispersion ◽

Safety Glass ◽

Enhanced Properties ◽

Multifilament Yarns ◽

Textile Coating ◽

Recycled Material

AbstractPolyvinyl butyral is used in safety glass interlayers, mainly in car windshields. Legislative regulations require a recycling of cars after their lifetime and therefore also their safety glass. This causes the availability of recycled polyvinyl butyrate (r-PVB) originated from safety glass interlayers. Due to deteriorated optical properties, such as the transparency, and unknown amounts of plasticizers, it is challenging to reuse the recycled material in new windshields. Therefore, it is of particular interest to find new fields of application for r-PVB, such as the usage as a textile coating. In this research, r-PVB was investigated as a material for yarn coating. Polyester and polyamide mono- and multifilament yarns were coated continuously with solely a polymer dispersion and with mixtures of crosslinking agent and polymer dispersion. Crosslinked r-PVB coatings showed enhanced properties toward abrasion and chemical resistance. Coatings without the crosslinking agent showed a diminished abrasion resistance and could be washed off with ethanol. Mechanical properties of the monofilaments were influenced by the r-PVB coating in general. However, varying concentrations of the crosslinking agent did not affect the mechanical properties.

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Modification of Mechanical Properties of High-Strength Titanium Alloys VT23 and VT23M Due to Impact-Oscillatory Loading

Metals ◽

10.3390/met9010080 ◽

2019 ◽

Vol 9 (1) ◽

pp. 80 ◽

Cited By ~ 5

Author(s):

Mykola Chausov ◽

Janette Brezinová ◽

Andrii Pylypenko ◽

Pavlo Maruschak ◽

Liudmyla Titova ◽

...

Keyword(s):

Mechanical Properties ◽

Titanium Alloys ◽

High Strength ◽

The Self ◽

Self Organization ◽

Two Phase ◽

Rolled Metal ◽

Technological Method ◽

Equilibrium Processes ◽

Production Conditions

A simple technological method is proposed and tested experimentally, which allows for the improvement of mechanical properties in sheet two-phase high-strength titanium alloys VT23 and VT23M on the finished product (rolled metal), due to impact-oscillatory loading. Under impact-oscillatory loading and dynamic non-equilibrium processes (DNP) are realized in titanium alloys, leading to the self-organization of the structure. As a result, the mechanical properties of titanium alloys vary significantly with subsequent loading after the realization of DNP. In this study, the test modes are found, which can be used in the production conditions.

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The Effect of Superabsorbent Polymers on the Microstructure and Self-Healing Properties of Cementitious-Based Composite Materials

Applied Sciences ◽

10.3390/app11020700 ◽

2021 ◽

Vol 11 (2) ◽

pp. 700

Author(s):

Irene A. Kanellopoulou ◽

Ioannis A. Kartsonakis ◽

Costas A. Charitidis

Keyword(s):

Mechanical Properties ◽

Composite Materials ◽

Hybrid Structure ◽

The Self ◽

Self Healing ◽

Cementitious Composite ◽

Superabsorbent Polymers ◽

Porosity Reduction ◽

Environment Control ◽

The Impact

Cementitious structures have prevailed worldwide and are expected to exhibit further growth in the future. Nevertheless, cement cracking is an issue that needs to be addressed in order to enhance structure durability and sustainability especially when exposed to aggressive environments. The purpose of this work was to examine the impact of the Superabsorbent Polymers (SAPs) incorporation into cementitious composite materials (mortars) with respect to their structure (hybrid structure consisting of organic core—inorganic shell) and evaluate the microstructure and self-healing properties of the obtained mortars. The applied SAPs were tailored to maintain their functionality in the cementitious environment. Control and mortar/SAPs specimens with two different SAPs concentrations (1 and 2% bwoc) were molded and their mechanical properties were determined according to EN 196-1, while their microstructure and self-healing behavior were evaluated via microCT. Compressive strength, a key property for mortars, which often degrades with SAPs incorporation, in this work, practically remained intact for all specimens. This is coherent with the porosity reduction and the narrower range of pore size distribution for the mortar/SAPs specimens as determined via microCT. Moreover, the self-healing behavior of mortar-SAPs specimens was enhanced up to 60% compared to control specimens. Conclusively, the overall SAPs functionality in cementitious-based materials was optimized.

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