On Developing a Hydrophobic Rubberized Cement Paste

Chen, Chi-Yao; Shen, Zih-Yao; Lee, Maw-Tien

doi:10.3390/ma14133687

Cited by 7 publications

(5 citation statements)

References 58 publications

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“…The high porosity is probably balanced by a non-absorbing repellent character, which partially reduced the effect of high porous inner structure. From the point of view of moderation of water ingress, the most advantageous hygric parameters were measured for the samples containing crumb rubber, which was due to its hydrophobic nature recently reported by Chen et al [ 69 ].…”

Section: Resultsmentioning

confidence: 99%

Magnesium Potassium Phosphate Cement-Based Derivatives for Construction Use: Experimental Assessment

et al. 2022

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The presented research is focused on the development and testing of the magnesium potassium phosphate cement-based materials (MKPC-based). Firstly, the fresh state properties of the pastes consisting of dead burned magnesia powder, potassium dihydrogen phosphate, setting retarder borax applied in the range of 0–10 wt.%, and batch water were investigated. The aim of testing was to characterize the hydration process in dependence on the borax content. The properties of raw MgO powder were described by chemical composition and particle size distribution. The properties tested in fresh state included shear stress (viscosity), Young’s modulus of elasticity, and temperature; their time dependence was observed. The measurements started immediately after the mixing process. At the age of 14 days, basic structural and mechanical properties of the hardened pastes were obtained. The mixture with 5 wt.% of borax proved to be the most advantageous in terms of setting time, sample integrity, and mechanical strength; therefore, it was chosen as the binder for the following part of the study—MKPC-based mortar development. In the next step, the MKPC paste containing 5 wt.% of borax was supplemented by silica sand aggregate, and the resulting material was marked as a reference. Subsequently, three other mixtures were derived by replacing 100% of quartz sand by lightweight aggregate; namely by expanded glass aggregate, waste rubber from tires, and combination of both in ratio 1:1. The aggregates were characterized by chemical composition (except for the rubber granulate), and loose and compacted powder density. For the resulting hardened composites, basic structural, hygric, strength, and thermal parameters were investigated. The use of lightweight aggregates brought in a considerable decrease in heat transport parameters and low water permeability while maintaining sufficient strength. The favorable obtained material properties are underscored by the fact that magnesia-phosphate is considered to be a low-carbon binder. The combination of magnesia-phosphate binder and recycled aggregate provides a satisfying, environmentally friendly, and thermally efficient alternative to traditional Portland cement-based materials.

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Section: Resultsmentioning

confidence: 99%

Magnesium Potassium Phosphate Cement-Based Derivatives for Construction Use: Experimental Assessment

et al. 2022

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“…In addition, increasing industrial waste generation on a global scale means there is a growing interest in using waste materials as additives for cement and construction applications. Industrial wastes, including paper sludge ash, rubber, and short textile waste fibers, have been the subject of investigation in this context (Wong et al, 2015;Chen et al, 2021;Sadrolodabaee et al, 2021).…”

Section: Research Articlementioning

confidence: 99%

“…Their findings indicated that replacing 12% of Portland cement with paper sludge ash led to an 84% reduction in water absorption without negatively impacting material strength. Another investigation by Chen et al (2021) explored the use of crumb rubber treated with partial oxidation as an additive in cement paste. The study revealed that pretreated crumb rubber facilitated the development of a hydrophobic rubberized cement paste.…”

Section: Research Articlementioning

confidence: 99%

Effect of aluminum hybrid additive on water absorption of fiber-cement composites

Nithipaiboon,

Prakaypan,

Chakartnarodom

et al. 2023

SEHS

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Moisture movement and aggressive ions being transferred into a fiber-reinforced cement composite structure have negative effects in terms of mechanical properties and durability. When an aluminum hybrid additive (AHA) is incorporated into a fiber-reinforced cement composite composition, its reaction product provides a water-repellent layer along the capillary pores, resulting in a damp-proofing effect. In this study, the influences of AHA on the hydration reaction kinetics and microstructural features were characterized by isothermal calorimetry and thermogravimetry analysis. The percentages of AHA added to the mixtures varied from 0 to 5% w/w. The samples were formed by a filter-pressing process. After the sample forming process, the green samples were cured in air for 7, 14 and 28 days. The addition of 3% w/w AHA, based on the weight percent of cement, shortened the setting time of cement paste by almost 40%. Microstructural analysis of the cement matrix showed packing efficiency of the crystalline phase was improved when adding 3% w/w AHA to the mixture. This AHA mixture showed integral hydrophobicity, with contact angles greater than 140° on the surface and 16.51% porosity. These results corresponded to a decrease in water absorption of almost 50%, compared to the reference composition. Moreover, the enhancement of the mechanical properties of the samples, including modulus of elasticity, modulus of rupture and impact strength, surpassed the requirements for wallboard applications.

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“…Treating rubber powder with a silane coupling agent and carboxylated styrene butadiene rubber latex improved compressive strength and flexural strength by 4% and 13%, respectively, compared to the control concrete without rubber [33]. The partial oxidation treatment produced hydrophilic functional groups on rubber surfaces leading to the higher compressive strength of rubberised concrete compared to control samples without rubber powder [34,35]. A further study demonstrated that rubber powder oxidised with KMnO 4 solution and then sulphonated with NaHSO 3 achieved a 41.1% increase in the adhesion strength of the rubber and OPC paste [36].…”

Section: Introductionmentioning

confidence: 97%

Thermal and Mechanical Properties of Concrete Incorporating Silica Fume and Waste Rubber Powder

et al. 2022

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Using waste rubber tires for concrete production will reduce the demand for natural aggregate and help to reduce environmental pollution. The main challenge of using waste rubber tires in concrete is the deterioration of mechanical properties, due to poor bonding between rubber and cement matrix. This research aims to evaluate the mechanical and thermal properties of rubberised concrete produced by using different proportions of rubber powder and silica fume. Ordinary Portland cement was partially replaced with silica fume by amounts of 5%, 10%, 15% and 20%, while sand was replaced by 10%, 20% and 30% with waste rubber powder. Tests were carried out in order to determine workability, density, compressive strength, splitting tensile strength, elastic modulus, thermal properties, water absorption and shrinkage of rubberised concrete. The compressive strength and splitting tensile strength of concrete produced using waste rubber powder were reduced by 10–52% and 9–57%, respectively. However, the reduction in modulus of elasticity was 2–36%, less severe than compressive and splitting tensile strengths. An optimum silica fume content of 15% was observed based on the results of mechanical properties. The average shrinkage of concrete containing 15% silica fume increased from −0.051% to −0.085% at 28 days, as the content of waste rubber powder increased from 10% to 30%. While the thermal conductivity of rubberised concrete was reduced by 9–35% compared to the control sample. Linear equations were found to correlate the density, splitting tensile strength, modulus of elasticity and thermal conductivity of concrete with silica fume and waste rubber powder.

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On Developing a Hydrophobic Rubberized Cement Paste

Cited by 7 publications

References 58 publications

Magnesium Potassium Phosphate Cement-Based Derivatives for Construction Use: Experimental Assessment

Magnesium Potassium Phosphate Cement-Based Derivatives for Construction Use: Experimental Assessment

Effect of aluminum hybrid additive on water absorption of fiber-cement composites

Thermal and Mechanical Properties of Concrete Incorporating Silica Fume and Waste Rubber Powder

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