Mechanical properties and microstructure of alkali activated Pisha sandstone geopolymer composites

Liu, Changming; Zhang, Ting Ting; Wang, Lijiu

doi:10.1016/j.conbuildmat.2014.06.051

Cited by 55 publications

(32 citation statements)

References 19 publications

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“…However, it becomes soft and muddy once exposed to water and is thus prone to wind and water erosions (Zhen et al, 2016). Since the 1950s, many measures have been taken to fight against the wind and water erosions mainly including biologicals and engineering (Li et al, 2015). The biological measures include forest shelter-belts, windbreak and sand fixation forests, slope protection plants, and seabuckthorn flexible dams (Zhang et al, 2009;Yang et al, 2013Yang et al, , 2014.…”

Section: Introductionmentioning

confidence: 99%

A new ecological control method for Pisha sandstone based on hydrophilic polyurethane

Linag

Noori

et al. 2017

J. Arid Land

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The Pisha sandstone-coverd area is among the regions that suffer from the most severe water loss and soil erosion in China and is the main source of coarse sand for the Yellow River. This study demonstrated a new erosion control method using W-OH solution, a type of hydrophilic polyurethane, to prevent the Pisha sandstone from water erosion. We evaluated the comprehensive effects of W-OH on water erosion resistance and vegetation-growth promotion through simulated scouring tests and field demonstrations on the Ordos Plateau of China. The results of simulated scouring tests show that the water erosion resistance of W-OH treated area was excellent and the cumulative sediment yield reduction reached more than 99%. In the field demonstrations, the vegetation coverage reached approximately 95% in the consolidation-green area, and there was almost no shallow trenches on the entire slope in the treated area. In comparison, the control area experienced severe erosion with deep erosion gullies appeared on the slope and the vegetation coverage was less than 30%. This study illustrated that W-OH treatment can protect the Pisha sandstone from erosion and provide the vegetation seeds a chance to grow. Once the vegetation matured, the effects of consolidation-growth mutual promotion can efficiently and effectively improve the water erosion resistance and ecological restoration.

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Section: Introductionmentioning

confidence: 99%

A new ecological control method for Pisha sandstone based on hydrophilic polyurethane

Linag

Noori

et al. 2017

J. Arid Land

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“…Han et al [20] proposed to compound soil with Pisha sandstone and aeolian sandy soil to improve the water retention characteristics. Li et al, [21] used Pisha sandstone via alkali activation process to produce a new raw structural material.…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Method of Erosion Resistance and Growth Promotion for Pisha Sandstone

Liang¹

2018

GEOMATE

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Pisha sandstone is a special type of soft rock that is severely eroded by wind, rainfall, and gravitational force. The surface of the area in the region consisting of this sandstone has been degraded as a result of excessive human activities, and the vegetation cover in this area is extremely low. In order to develop new methods to control further erosion and mitigate the adverse impacts of landslides, the material components, nutrient contents and the shear strength of Pisha sandstone were studied and field experiments via utilizing a new comprehensive method based on a hydrophilic polyurethane (W-OH) was carried out. The results revealed that in Pisha sandstone the main minerals are quartz, feldspar, plagioclase, montmorillonite, illite, and kaolinite. The montmorillonite was found to be the main cementitious material, however, is easy to expand when meets water. The research also showed that the nutrient content is low, and the organic matter, total nitrogen, total phosphorus, total potassium and available phosphorus corresponds to the sixth-level, the nitrogen content corresponds to the fifth-level and the available potassium corresponds to the forth-level, according to the six-level classification of soil nutrient content grading table. In the field experiment, vegetation coverage rate in the treated area increased to more than 95% after 4 months, and shallow trenches literally disappeared. The amount of sediment erosion was reduced by more than 90%, indicating that the effect of erosion prevention and promoting vegetation growth is significant. A demonstration project of 0.2 km 2 was carried out in Odors in 2015 by this method which has resulted in promising outcomes, and the method has been widely accepted by the local community and soil conservation bureau.

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“…The Pisha sandstone is hard like rock when it is dry, but can collapse into sand within a minute when immersed in water 16 . Due to the special physical properties of the Pisha sandstone, coupled with the hydraulic, wind, and freeze-thaw erosion effects of the Pisha sandstone area, this area has severe soil erosion and an extremely harsh environment [17][18][19][20] . Multiple types of erosion occur alternately in this area, resulting in compound erosion; the erosion modulus in this area is as high as 30,000-40,000 t/(km 2 •a).…”

Section: Methodsmentioning

confidence: 99%

Profile distribution of soil moisture response to precipitation on the Pisha sandstone hillslopes of China

Zhang

Xiao

Yao

et al. 2020

Sci Rep

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The Pisha sandstone area in China is located on the upper and middle reaches of the Yellow River, which is a region with some of the most severe soil erosion in both the Loess Plateau and in the world. Soil moisture is an important link between rainfall, surface water, and groundwater, and it plays a critical role in vegetative growth, ecosystem health, and the restoration of degraded vegetation. This study investigated the dynamic characteristics of soil moisture and its influencing factors in the hillslopes of the Pisha sandstone area using mathematical statistics and hydrochemical analysis methods. The results resolved that precipitation is the major direct source of soil moisture. Soil moisture fluctuated with precipitation, but the response time of these fluctuations was directly related to the antecedent soil moisture. Thus, while precipitation events increase the soil moisture content of the Pisha sandstone, they will not change the vertical distribution of moisture in the soil profile. The positive effect of precipitation on soil moisture was obvious in the soil layers above 50 cm, but deep soil moisture was less responsive to precipitation.

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Mechanical properties and microstructure of alkali activated Pisha sandstone geopolymer composites

Cited by 55 publications

References 19 publications

A new ecological control method for Pisha sandstone based on hydrophilic polyurethane

A new ecological control method for Pisha sandstone based on hydrophilic polyurethane

A Comprehensive Method of Erosion Resistance and Growth Promotion for Pisha Sandstone

Profile distribution of soil moisture response to precipitation on the Pisha sandstone hillslopes of China

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