The Basic Mechanical Properties and Shrinkage Properties of Recycled Micropowder UHPC

Yuan, Chunyan; Chen, Yang; Li, Dongxu; Lv, Weiqian; Zhang, Zhe

doi:10.3390/ma16041570

Cited by 6 publications

(2 citation statements)

References 38 publications

(41 reference statements)

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“…This adverse impact is attributed to the increased water demand for a specified fluidity. As the RMP substitution rate rises, the cement content in the corresponding RMP-PP-ECC diminishes, leading to a reduction in C-S-H gel content within the hydration products and, consequently, a decline in the strength of the RMP-PP-ECC [43][44][45].…”

Section: Compressive Strength Of Cubesmentioning

confidence: 99%

Mechanical, Chloride Permeation, and Freeze–Thaw Resistance of Recycled Micronized Powder Polypropylene-Fiber-Engineered Cementitious Composites

Zheng,

Zhou

2023

Buildings

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Research on engineered cementitious composites was carried out using recycled micronized powder from waste construction waste as a substitute for cement. Consequently, this paper focuses on the investigation of recycled micronized powder (RMP) as the subject of study. Using RMP-PP-ECCA0 as the control group, we explored the impact of polypropylene fiber content (0.5%, 1%, 1.5%, 2%) and the substitution rate of RMP (10%, 20%, 30%, 40%) on the mechanical properties, resistance to chloride ion penetration, and freeze–thaw durability of recycled micronized powder polypropylene-fiber-engineered cementitious composites (RMP-PP-ECCs). It was found that, with the increase in RMP substitution rate and fiber content, the mechanical, chloride ion permeation, and freeze–thaw resistance of recycled micronized powder polypropylene-fiber-engineered cementitious composites showed a trend of increasing and then decreasing when the RMP substitution rate was 10%, and the fiber content was 1.5%; the compressive, tensile, chloride ion permeation, and freeze–thaw resistance of recycled micronized powder polypropylene-fiber-engineered cementitious composites were most obviously improved. Compressive strength performance increased by 18.8%, tensile strength performance increased by 80.8%, maximum tensile strain increased by 314%, and electrical flux decreased by 56.3%. Meanwhile, when the recycled micronized powder substitution rate was 10%, the fiber content was 1%, with the most obvious improvement in flexural and freeze–thaw cycle resistance, compared with the control group 28 d flexural strength increased by 22%, after 150 freeze–thaw cycles, the mass-loss rate was reduced by 26%, and the relative dynamic elastic modulus was improved by 4%. In addition, the chemical composition of the regenerated microfractions and the defects in the matrix of the fracture surface of the tensile specimens, the distribution of polypropylene fibers, the surface morphology, and the failure mode were analyzed by X-ray diffraction and scanning electron microscopy.

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Section: Compressive Strength Of Cubesmentioning

confidence: 99%

Mechanical, Chloride Permeation, and Freeze–Thaw Resistance of Recycled Micronized Powder Polypropylene-Fiber-Engineered Cementitious Composites

Zheng,

Zhou

2023

Buildings

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“…It has become a development trend in the construction industry [2][3][4]. For example, the penetration rate of prefabricated buildings has surpassed 70% in Sweden [5][6][7]. Additionally, as concrete is a materials for prefabricated buildings, a large amount of waste concrete building will be produced during the demolition of construction waste.…”

Section: Introductionmentioning

confidence: 99%

Study on Alkali-Activated Prefabricated Building Recycled Concrete Powder for Foamed Lightweight Soils

Xiao

Guo

2023

Materials

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The advantage of a prefabricated building is its ease of construction. Concrete is one of the essential components of prefabricated buildings. A large amount of waste concrete from prefabricated buildings will be produced during the demolition of construction waste. In this paper, foamed lightweight soil is primarily made of concrete waste, a chemical activator, a foaming agent, and a foam stabilizer. The effect of the foam admixture on the wet bulk density, fluidity, dry density, water absorption, and unconfined compressive strength of the material was investigated. Microstructure and composition were measured by SEM and FTIR. The results demonstrated that the wet bulk density is 912.87 kg/m3, the fluidity is 174 mm, the water absorption is 23.16%, and the strength is 1.53 MPa, which can meet the requirements of light soil for highway embankment. When the foam content ranges from 55% to 70%, the foam proportion is increased and the material’s wet bulk density is decreased. Excessive foaming also increases the number of open pores, which reduces water absorption. At a higher foam content, there are fewer slurry components and lower strength. This demonstrates that recycled concrete powder did not participate in the reaction while acting as a skeleton in the cementitious material with a micro-aggregate effect. Slag and fly ash reacted with alkali activators and formed C-N-S(A)-H gels to provide strength. The obtained material is a construction material that can be constructed quickly and reduce post-construction settlement.

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Potential of recycled powder from clay Brick, sanitary Ware, and concrete waste as a cement substitute for Concrete: An overview

Tanash

Muthusamy

Yahaya

et al. 2023

Construction and Building Materials

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The Basic Mechanical Properties and Shrinkage Properties of Recycled Micropowder UHPC

Cited by 6 publications

References 38 publications

Mechanical, Chloride Permeation, and Freeze–Thaw Resistance of Recycled Micronized Powder Polypropylene-Fiber-Engineered Cementitious Composites

Mechanical, Chloride Permeation, and Freeze–Thaw Resistance of Recycled Micronized Powder Polypropylene-Fiber-Engineered Cementitious Composites

Study on Alkali-Activated Prefabricated Building Recycled Concrete Powder for Foamed Lightweight Soils

Potential of recycled powder from clay Brick, sanitary Ware, and concrete waste as a cement substitute for Concrete: An overview

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