scholarly journals The Effect of Polymer Powder on the Cracking of the Subbase Layer Composed of Cold Recycled Bitumen Emulsion Mixtures

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5867
Author(s):  
Jakub Krasowski ◽  
Przemysław Buczyński ◽  
Marek Iwański
Keyword(s):  
Fracture Resistance ◽  
Asphalt Emulsion ◽  
Bending Tests ◽  
Bitumen Emulsion ◽  
Polymer Powder ◽  
Two Temperatures ◽  
Cement Mixture ◽  
Polymer Modifier ◽  
The Right ◽  
Redispersible Polymer Powder

The research was aimed at assessing the effect of the redispersible polymer powder on the fracture resistance of a subbase made of a mineral–cement mixture with a bitumen emulsion. The test was performed at two temperatures, i.e., 0 °C and 20 °C. The prepared mixtures differed in the content of cement, asphalt emulsion, and polymer modifier. Cement and redispersible polymer powder were dosed in 1.5% steps from 0.5% to 3.5% while the amount of bitumen emulsion ranged from 0.0% to 5.0%. The SCB (semi-circular bending) tests carried out in the laboratory showed the dependence of the influence of the amount of binder and polymer modifier on the fracture resistance of the recycled subbase. Mixes containing a polymer modifier in their composition are characterized by a much higher resistance to cracking than traditional mineral–cement–emulsion mixtures. An example is the doubling of the framework’s fracture toughness (KIC) when the amount of the polymer modifier is increased from 0.5% to 2.0% with a constant cement content of 0.5%. The obtained results (KIC) in this case were 2.90 and 5.81. The key is the right ratio of polymer powder and cement in the base composition.

scholarly journals Analysis of the Impact of Redispersible Polymer Powder on the Water and Frost Resistance of Cold-Recycled Mixture with Bitumen Emulsion

2021 ◽  
Vol 1203 (2) ◽  
pp. 022006
Author(s):  
Jakub Krasowski ◽  
Marek Iwański ◽  
Przemysław Buczyński
Keyword(s):  
Frost Resistance ◽  
Impact Analysis ◽  
Void Content ◽  
Asphalt Emulsion ◽  
Mixture Density ◽  
Bitumen Emulsion ◽  
Polymer Powder ◽  
Aashto T283 ◽  
The Impact ◽  
Redispersible Polymer Powder

Abstract The subject of the research presented in the article is the assessment of the effect of redispersible polymer powder (RPP) on water and frost resistance of a cold-recycled mixture with bitumen emulsion (BE-CRM). The article presents the results of research on the influence of polymer powder EVA based on polymer (polyethylene-co-vinyl acetate) on the properties of BE-RCM. The impact analysis was determined using the assumptions of the Box-Behnken experiment plan in which three components are controlled. In this case, the variables were the content of: polymer, cement and asphalt emulsion. All ingredients were dosed with a step of 1.5% of the percentage share in the mixture composition. Polymer and Portland cement in an amount of 0.5% to 3.5%. On the other hand, the pure asphalt originating from the asphalt emulsion was 0.0%, 1.5% and 3.0%, respectively. The scope of the tests included the determination of: mixture density, void content (Vm), water absorption (nw), intermediate tensile strength (ITS), to water (TSR) as well as water and frost according to AASHTO T283.

Freezing and Thawing Resistance of Cement Asphalt Mortar

2008 ◽  
Vol 400-402 ◽  
pp. 163-167 ◽  
Author(s):  
Shu Guang Hu ◽  
Tao Wang ◽  
Fa Zhou Wang ◽  
Zhi Chao Liu ◽  
Tao Gao ◽  
...  
Keyword(s):  
Elastic Moduli ◽  
Crumb Rubber ◽  
Influential Factors ◽  
Freezing And Thawing ◽  
Asphalt Emulsion ◽  
Polymer Powder ◽  
Cement Asphalt Mortar ◽  
Ca Mortar ◽  
Asphalt Mortar ◽  
Redispersible Polymer Powder

In this paper, freezing and thawing resistance of CA mortar was investigated and some influential factors such as the ratio between asphalt emulsion and cement (A/C), cement types, various additives were also explored. Results indicated that a gain of mass was observed for every mixture after the test; mixtures with a higher A/C performed better in terms of higher relative elastic moduli. Mixtures proportioned by partially replacing ordinary Portland cement (OPC) with sulfoalumninate cement (SAC) underperformed in freezing and thawing property. Addition of crumb rubber powder (CRP), redispersible polymer powder (RPP) and organic fiber (FR) improved the resistance of CA mortar to freezing and thawing while that of silica fume (SF) undermined it.

scholarly journals Effect of redispersible polymer powder on setting time of thin-bed mortars

2018 ◽  
Vol 163 ◽  
pp. 04005 ◽  
Author(s):  
Marcin Kulesza ◽  
Dawid Dębski ◽  
Jadwiga Fangrat
Keyword(s):  
Chemical Structure ◽  
Cement Mortar ◽  
Setting Time ◽  
Total Weight ◽  
Hydroxyethyl Cellulose ◽  
Chemical System ◽  
Acrylic Copolymer ◽  
Polymer Powder ◽  
Redispersible Polymer Powder ◽  
Polymer Powders

The aim of work is to describe and to complement the existing knowledge on the effect of redispersible polymer powder on the setting time of cement mortar as measured by means of ultrasonic apparatus. The mortars were simple mixtures of filler in the form of quartz sand, Portland cement CEM I 42.5 R as binder and methyl hydroxyethyl cellulose. The mortar additives were two commercially available redispersible polymer powders in an amount of 0-5% of total weight. The chosen polymers had different chemical structure: styrene-acrylic copolymer (SA), vinyl acetate-ethylene copolymer (ET), and minimum film forming temperature (MFFT). The amount of water was constant and equal to 20% of the total weight of the mortar. Conclusions: - even the small amount of redispersible polymer powder added to the cement mortar has a significant influence on mortar’s initial and final setting time and this effect strongly depends on the percentage of the additive, - the chemical structure of the studied redispersible polymer powders did not influence the behaviour of the whole chemical system, - the further studies on technical properties, such as mechanical strength and permeability are planned in order to find more information on the structure of hardened mortar.

The Preparation and Characterization of Redispersible Polymer Powder with Core-Shell Structure

2013 ◽  
Vol 687 ◽  
pp. 88-93
Author(s):  
Jian Xu ◽  
Zhong Jun Feng ◽  
Le Feng Fu ◽  
Bai Cun Zheng
Keyword(s):  
Electron Microscopy ◽  
Spray Drying ◽  
Shell Morphology ◽  
Core Shell ◽  
Drying Methods ◽  
Seeded Emulsion Polymerization ◽  
Transition Electron Microscopy ◽  
Polymer Powder ◽  
Particle Size Analyzer ◽  
Redispersible Polymer Powder

Acrylate polymer emulsion was synthesized by semi-continuous seeded emulsion polymerization with methacrylic acid (MAA) as the hydrophilic shell monomer. The redispersible polymer powder was prepared by spray drying method. The effects of the amount of MAA, styrene (St) stoichiometry equivalents to methyl methacrylate, and two kinds of spray drying methods on size distribution of the redispersible polymer powder were further systematically investigated. The Malvern laser particle size analyzer, transition electron microscopy (TEM), scanning electron microscopy (SEM) and differential scanning calorimeter were employed to characterize the redispersible polymer powder. Results showed that the redispersible polymer powder obtained by pneumatic spray drying with excellent re-dispersibility could be synthesized at 10 % of MAA, 50 % of St stoichiometry equivalents. The final copolymer emulsion with “perfect” core-shell morphology was approved by TEM, and the comparable film forming ability of the redispersible polymer powder with the original emulsion was observed by SEM, which could form a dense and smooth membrane.

scholarly journals Structural Strength of Cemented Carbides

2021 ◽  
Vol 71 (2) ◽  
pp. 291-298
Author(s):  
Soroka Olena ◽  
Rodichev Iuriy ◽  
Vorontsov Borys ◽  
Protasov Roman
Keyword(s):  
Carrying Capacity ◽  
Fracture Resistance ◽  
Structural Strength ◽  
Cemented Carbides ◽  
Local Fracture ◽  
Bending Tests ◽  
Tool Materials ◽  
Continuous Scanning ◽  
Tool Cutting ◽  
Further Development

Abstract The concept “structural strength of tool materials” got further development. The refusals of cemented carbide cutting plates, when heavy machining were analyzed. It was shown that 70…80% of refusals are the microchipping of cutting edges, tool cutting part chipping, cutting plate macrofracture. To assess cutting plate total carrying capacity and the influence of different methods of cemented carbides modification, bending tests were held. Local fracture resistance and damageability of cutting edge were assessed under its continuous scanning.

Properties of VA/E/MMA Terpolymer Powder-Modified Mortars

2015 ◽  
Vol 1129 ◽  
pp. 169-176
Author(s):  
Sunhee Hong ◽  
Wan Ki Kim
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Cement Mortar ◽  
Mercury Porosimetry ◽  
Chloride Ion ◽  
Test Results ◽  
Polymer Powder ◽  
Chloride Ion Penetration ◽  
Redispersible Polymer Powder

This study is to examine and clarify the quality of polymer-modified mortars using a VA/E/MMA terpolymer powder as compared with polymer-modified mortars using a VAE copolymer powder. Polymer-modified mortars using general commercial redispersible polymer powders are prepared with various polymer-cement ratios, and tested for flexural and compressive strengths, tensile strength, water absorption, chloride ion penetration, carbonation and pore size distribution by mercury porosimetry. Overall, the properties of polymer-modified mortars using a VA/E/MMA terpolymer powder were superior to those of polymer-modified mortars using a VAE copolymer powder. And VA/E/MMA terpolymer powder-modified mortars showed significantly improved mechanical properties and durability in comparison with unmodified mortar. It is concluded from the test results that the modification of cement mortar with redispersible polymer powder improves the properties of unmodified mortar, and VA/E/MMA terpolymer powder has higher quality than VAE copolymer powder.

The Influence of Redispersible Powder on Mechanical Properties of EPS Light-Aggregate Concrete

2014 ◽  
Vol 651-653 ◽  
pp. 173-176 ◽  
Author(s):  
Jian Cui
Keyword(s):  
Cement Paste ◽  
Lightweight Concrete ◽  
Social Economic ◽  
Polymer Network ◽  
Hardened Cement ◽  
Hardened Cement Paste ◽  
Aggregate Concrete ◽  
Polymer Powder ◽  
New Type ◽  
Redispersible Polymer Powder

Polystyrene foam (EPS) light-aggregate concrete is a new type of light-aggregate concrete, in which adds redispersible emulsion powder, It improves the structure of hardened cement paste and form the polymer network,. It can also improve toughness of the hardened cement paste; So as to improve the properties and the workability and mechanical of the EPS light-aggregate concrete.The research of redispersible polymer powder on EPS ultra lightweight concrete performance has an important practical value and social economic benefit

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