Role of biochar from corn straw in influencing crack propagation and evaporation in sodic soils

Yang, Binbin; Li, Dongdong; Yuan, Shichong; Jin, Lichuang

doi:10.1016/j.catena.2021.105457

Cited by 54 publications

(15 citation statements)

References 44 publications

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“…It is commonly used in the quick repair of buildings and road traffic [2], solidification of nuclear waste and toxic substances [3], wastewater treatment [4], and restoration of teeth and bones in biology and medicine [5]. Compared with ordinary Portland cement, MPC has a shorter setting time, higher early strength, and better volume stability [2,[6][7][8]. In the application of MPC, potassium dihydrogen phosphate (KDP) and ammonium dihydrogen phosphate (ADP) are usually used as the phosphate components.…”

Section: Introductionmentioning

confidence: 99%

Fractal Analysis on Pore Structure and Modeling of Hydration of Magnesium Phosphate Cement Paste

et al. 2022

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Magnesium phosphate cement (MPC) paste is hardened by the acid–base reaction between magnesium oxide and phosphate. This work collects and evaluates the thermodynamic data at 25 ℃ and a pressure of 0.1 MPa and establishes the hydration reaction model of MPC pastes. The influence of the magnesium–phosphorus molar (M/P) ratio and water-to-binder (W/B) ratio on the hydration product is explored by the thermodynamic simulation. Following this, the initial and ultimate states of the hydration state of MPC pastes are visualized, and the porosity of different pastes as well as fractal analysis are presented. The result shows that a small M/P ratio is beneficial for the formation of main hydration products. The boric acid acts as a retarder, has a significant effect on lowering the pH of the paste, and slows down the formation of hydration products. After the porosity comparison, it can be concluded that the decreasing of M/P and W/B ratios helps reduce porosity. In addition, the fractal dimension Df of MPC pastes is positively proportional to the porosity, and small M/P ratios as well as small W/B ratios are beneficial for reducing the Df of MKPC pastes.

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Section: Introductionmentioning

confidence: 99%

Fractal Analysis on Pore Structure and Modeling of Hydration of Magnesium Phosphate Cement Paste

et al. 2022

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“…Overburden grouting technology combining with coal pillars has implemented in several coal mines in China; the results show that it has little affection on normal coal excavation and surface subsidence reduction ratio [17,18]. However, the panel layout design only based on the dip direction of the panel can caused the low coal recovery production.…”

Section: Discussionmentioning

confidence: 99%

“…The surface subsidence is one of the most common disasters and may cause farmlands destruction, ground buildings damages and water logging [5][6][7][8]. Over the past decades, with coal excavation increased, the social and environmental problem associated mining subsidence in China has become progressively more serious [9][10][11][12] and induced the development of measures to mitigate surface subsidence and improve surface environment, such as strip coal pillar mining, backfilling method, overburden grouting [13][14][15][16], and soil reinforcing [17][18][19]. Overburden grouting method as one of the special mining method is considered to be an effective method to mit-igate overburden failure and control surface subsidence without affecting the subsurface mining [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Calculation of Subsidence due to Longwall Mining with Overburden Grouting and Its Application

Wang

2022

Geofluids

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This paper presents a prediction method of mining-induced surface subsidence due to longwall mining with overburden grouting, which has been proven an effective method to mitigate the overburden failure. This paper proposes a partial overburden grouting (POG) mining method based on surface subsidence basin inversion and innovative longwall panel layout to mitigate overburden failure and subsidence. A prediction model of surface subsidence with overburden grouting, namely, overburden grouting equivalent calculation model (OGECM), is proposed. In this study, an engineering design process and method of POG was established, the strike and dip excavation length and grouting quantity combined as critical indicators for determining the key parameter in surface basin control. In applications at the field grouting test, the surface subsidence characteristics of POG on the side of the opening line of longwall panel were investigated through surface observation station and estimated surface subsidence reduction ratio based on OGECM with grouting compared with those without. The field measurement validated the new subsidence calculation method. POG technology applied to subsidence control has effectiveness in controlling the surface subsidence to less engineering cost but expanding the applications.

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“…Biochar prepared from corn stalk is widely used as addition of phosphorous in agriculture and increases water retention capacity of soils [38][39][40]. The corn stalk biochar has been widely industrial produced as a commonly used biochar type [41]. Due to a large number of corn planted in the Yellow River Basin in China, large amounts of corn straws are produced every year.…”

Section: Methodsmentioning

confidence: 99%

Effect of Corn Stalk Biochar on the Evolution of Water Evaporation and Cracking of Soil

Zhang

et al. 2022

Geofluids

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The evolution of water evaporation and cracking of soil affected by corn stalk biochar is experimentally investigated. Water evaporates from the soil surface, causing shrinkage in soil body and forming cracks, which significantly lead to crop nutrient loss, groundwater pollution, and land salinization. Biochar is a recyclable natural material widely used in improving the water retention and suppression of cracking of soils. Free desiccation tests were conducted with adding the biochar contents of 0%, 4%, and 8%. The variation of water evaporation amount and the development of cracking were recorded and disposed. The results show that the evaporation process can be changed due to the addition of biochar contents. The evaporation rate can be divided into three phases of a constant rapid evaporation phase, a fluctuated evaporation phase, and a residual evaporation phase. A sudden increase at around 30% of moisture content in evaporation rate indicated that the crack began to develop and extend greatly, which increased the evaporation surface area. The residual moisture contents of soils with biochar contents of 4% and 8% increased by 105.56% and 88.38% than those of soil without biochar, respectively. The crack ratio reduced by 32.39% and 15.31% with the addition of biochar contents of 4% and 8%, respectively. A three-level crack was observed during evaporation process, where a second and third crack developed less with the addition of biochars. The corn stalk biochar improves the integrity of soil bodies and increases the connection of soil particles for more water storing between the biochar particles and soil particles. It can be concluded that corn stalk biochars are able to delay the evaporation and cracking developing in cohesive soils, which may be beneficial for crops in dry area.

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Role of biochar from corn straw in influencing crack propagation and evaporation in sodic soils

Cited by 54 publications

References 44 publications

Fractal Analysis on Pore Structure and Modeling of Hydration of Magnesium Phosphate Cement Paste

Fractal Analysis on Pore Structure and Modeling of Hydration of Magnesium Phosphate Cement Paste

Calculation of Subsidence due to Longwall Mining with Overburden Grouting and Its Application

Effect of Corn Stalk Biochar on the Evolution of Water Evaporation and Cracking of Soil

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