Experimental Study on the Vegetation Growing Recycled Concrete and Synergistic Effect with Plant Roots

Wang, Fengchi; Sun, Chang; Ding, Xiaofeng; Kang, Tianbei; Nie, Xiaomei

doi:10.3390/ma12111855

Cited by 23 publications

(14 citation statements)

References 25 publications

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“…In recent years, vegetation lightweight porous concrete (VLPC) has emerged as an innovative integration of traditional concrete technology with the advantages of horticulture [ 1 , 2 ]. VLPC boasts a considerable pore volume and a distinctive pore structure [ 3 , 4 , 5 , 6 ], resulting in enhanced water permeability [ 7 ], efficient heat dissipation capacity [ 8 ], and notable sound absorption capability [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Study on the Preparation and Properties of Vegetation Lightweight Porous Concrete

Cao,

Zhou,

et al. 2024

Materials

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The objective of this study is to formulate vegetated light porous concrete (VLPC) through the utilization of various cementing materials, the design of porosity, and the incorporation of mineral additives. Subsequently, the study aims to assess and analyze key properties, including the bulk density, permeability coefficient, mechanical characteristics, and alkalinity. The findings indicate a linear decrease in the volume weight of VLPC as the designed porosity increases. While higher design porosity elevates the permeability coefficient, the measured effective porosity closely aligns with the design values. The examined VLPC exhibits a peak compressive strength of 17.7 MPa and a maximum bending strength of 2.1 MPa after 28 days. Notably, an escalation in porosity corresponds to a decrease in both the compressive and the bending strength of VLPC. Introducing mineral additives, particularly silicon powder, is shown to be effective in enhancing the strength of VLPC. Furthermore, substituting slag sulfonate cement for ordinary cement significantly diminishes the alkalinity of VLPC, resulting in a pH below 8.5 at 28 days. Mineral additives also contribute to a reduction in the pH of concrete. Among them, silica fume, fly ash, fly ash + slag powder, and slag powder exhibit a progressively enhanced alkaline reduction effect.

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Section: Introductionmentioning

confidence: 99%

Study on the Preparation and Properties of Vegetation Lightweight Porous Concrete

Cao,

Zhou,

et al. 2024

Materials

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“…The greater the porosity of the planting concrete, the more space there is for plant growth and the better the plants will grow; however, higher porosity leads to lower strength for concrete [ 6 ]. The type, shape, and size of the coarse aggregates and the water–cement ratio are influencing factors that greatly affect the physical and mechanical properties of the planting concrete, such as porosity and strength [ 7 , 8 ]. Kim et al [ 9 ] replaced the natural coarse aggregate with blast furnace slag, and when the blast furnace slag aggregate was replaced from 0 to 100%, the porosity of the planting concrete increased from 15 to 27.5%.…”

Section: Introductionmentioning

confidence: 99%

“…At the same time, the compressive strength decreased from 13 MPa to 11.5 MPa. Furthermore, using recycled aggregates as a substitute for natural aggregates with the same aggregate gradation of 5–25 mm [ 7 ], it was found that the compressive strength of the planting concrete decreased by 32%. Compared to natural aggregates, recycled aggregates have undergone mechanical wear and chemical degradation over a longer period of time, and mechanical damage from the crushing process causes more microcracks in the aggregates, resulting in their poorer performance as concrete aggregates; another reason for poor performance is the presence of mortar and interface transition zones in recycled concrete aggregates [ 10 ], which leads to weaker bonding between recycled aggregates and cement [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Aggregate Size and Water/Cement on Compressive Strength and Physiological Performance of Planting Concrete

Chen

Zhao

et al. 2022

Materials

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Planting concrete, an eco-friendly concrete in which plants can grow directly, has been widely used in roof greening and the slopes of rivers. Porosity and compressive strength are important indicators for evaluating the properties of planting concrete. By preparing planting concrete with different aggregate gradations (10–30 mm, 20–40 mm) and water–cement ratios (0.25, 0.27, 0.29, 0.31, 0.33), the effect of aggregate gradation and water–cement ratio on the porosity and compressive strength of the planting concrete was analyzed, the intrinsic relationship between aggregate gradation and plane pore parameters was studied, the strength growth pattern and microscopic strengthening mechanism were studied, the relationship between porosity and compressive strength of the planting concrete were explored, and a tall fescue planting experiment was carried out to evaluate the plantation performance of the planting concrete. The results show that under the same conditions of water–cement ratio, the smaller the particle size of the aggregate, the smaller the porosity of the plane, and the denser the structure. The average diameter of the planting concrete shows an exponential relationship with the porosity of plane. The early growth of the compressive strength of the planting concrete is rapid; the compressive strength has a linear relationship at the ages of 7 days and 28 days. Compared to polynomial and logarithmic functions, the exponential function gives a better insight into the relationship between the porosity and compressive strength of the planting concrete. Tall fescue seeds germinate and grow well; height, cover, and leaf rootstock and element content of plants can be used as indicators to assess the performance of vegetated concrete planting.

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“…Concrete’s raw materials, which include river sand and gravel, are mainly excavated from the riverbed and its surrounding area. However, the exploitation of river sand and gravels has caused serious damage to the river’s ecological environment [2,3,4,5]. For these reasons, most governments have determined to restrict the related exploitation engineering, so there is a shortage of concrete materials and its price has risen [6].…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Acoustic Emission Behavior of Gangue Concrete under Uniaxial Compression

et al. 2019

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The application of gangue concrete can be an effective method to solve the massive gangue heap and shortage of raw materials of concrete by replacing the gravel and river sand with crushed gangue. An Acoustic emission (AE) is one of the non-destructive testing methods that can be used for damage detection of the gangue concrete structure. However, there are obvious mechanics differences between gangue and gravel/river sand, so the previous analysis methods of AE signal for concrete structure detection, mainly applied to ordinary concrete, are not suitable for gangue concrete. Based on this, the physical and mechanical characteristics of coal gangue were studied, and the uniaxial compressive test, along with AE monitoring of gangue concrete, was conducted in this paper. The differences in AE behavior between gangue concrete and ordinary concrete were also analyzed. The mechanical test result shows that the compressive strength of gangue concrete can reach 35–40 MPa. Comparing with ordinary concrete, gangue concrete has larger initial porosity and abrupt rupture. Additionally, the accumulative energy growth rate of gangue concrete has two peak values before the peak load, while ordinary concrete only has one. This difference can be used to forecast damage of gangue concrete structure by AE technology. This paper shows the possibility of making concrete by coal gangue, and the possibility of identifying its damage degree with the use of acoustic emission technology.

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Experimental Study on the Vegetation Growing Recycled Concrete and Synergistic Effect with Plant Roots

Cited by 23 publications

References 25 publications

Study on the Preparation and Properties of Vegetation Lightweight Porous Concrete

Study on the Preparation and Properties of Vegetation Lightweight Porous Concrete

Effect of Aggregate Size and Water/Cement on Compressive Strength and Physiological Performance of Planting Concrete

Mechanical and Acoustic Emission Behavior of Gangue Concrete under Uniaxial Compression

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