Repeated drying–rewetting cycles and their effects on the emission of CO Three drying–wetting treatments with different rewetting intensities (8 20 and 50 mm of irrigation d –1) have been compared to a constantly moist control to estimate the influence of rainfall intensity under identical drying conditions and constant temperature Aug 09 2020In dry–wet repeated cycles condition the asphalt mixture with 50% steel slag content has a better water resistance while the asphalt mixture with steel slag content has a better water resistance under freeze–thaw repeated cycles condition The interface phase structure of steel slag asphalt mixture is stable and dense where the

Effect of repeated drying

Apr 29 2014Samples of soddy-podzolic soil (long-term overgrown fallow and continuous bare fallow) gray forest soil (forest farming agrocenosis) and a typical chernozem ( steppe forest area farming agrocenosis continuous bare fallow) have been incubated under stable conditions other samples of these soils have been subjected to six drying-wetting-incubation-freezing-thawing-incubation cycles

Influence of temperature and cycles of wetting and drying on modulus of rupture: Author(s) Salih R O Maulood A O Journal title: Soil and tillage research : an international journal on research and development in soil tillage and field traffic and their relationships with soil environment land use and crop production: Part(Year)Number: 11

tillers per hill was not associated with repeated wetting and drying as occurred in response to wider spacing the tillers were remarkably larger in stem diameter and leaf surface area The number of fertile tillers per hill was 69 5% higher with a rate of fertile tillering almost twice as high (58 6% vs 31 8%)

tillers per hill was not associated with repeated wetting and drying as occurred in response to wider spacing the tillers were remarkably larger in stem diameter and leaf surface area The number of fertile tillers per hill was 69 5% higher with a rate of fertile tillering almost twice as high (58 6% vs 31 8%)

The overall influence of drying/wetting cycles depends on the weights of the three factors For the specimens subjected to drying/wetting cycles the cyclic shear strength increased with the increasing of loading frequency Scanning electron micrographs show that soil particles were drawn closer together during the drying/wetting cycle process

Influence of wet and drying cycles on behaviour of cement

accelerated wet and drying weathering cycles In the drying cycle it was employed a 50C temperature in an oven with forced air flow circulation In the saturation cycle the composites specimens were submerged in the same temperature water The effects of the cycles were evaluated based on the results of mechanical

Mar 30 2017When the number of wetting-drying cycles was 10 20 30 40 and 50 the density was reduced by 2 16% 3 86% 4 38% 4 80% and 5 38% respectively It also can be seen that the relationship between density and number of wetting-drying cycles could be described by an exponential equation and the best-fit line is plotted in Fig 4

After four drying–wetting cycles the soil reaches a nearly constant state The POSD change of multiple drying–wetting cycle samples is consistent with the SWCC of the soils Furthermore a modified van Genuchten model in terms of cumulative pore volume is used to obtain the best-fit POSD of the drying–wetting cycle samples

Temporal Microbial Response to Wetting-Drying Cycles in Soils within and Outside the Influence of a Shrub in the Sahel () Sally Diatta 1 2 Sidy Diakhat 1 3 Hassna Founoune-Mboup 1 Charlotte J Alster 4 Digane Diouf 2 Richard P Dick 5 Lydie Chapuis-Lardy 6 Laurent Cournac 6 Ndeye Yacine Badiane-Ndour 1

Freeze drying is the removal of ice or other frozen solvents from a material through the process of sublimation and the removal of bound water molecules through the process of desorption Lyophilization and freeze drying are terms that are used interchangeably depending on the industry and location where the drying is taking place

Nov 13 2014The effects of wet–dry freeze–thaw and heat–cool cycles on the physical and mechanical properties of Upper Red Formation sandstones located southwest of Qom central Iran were determined Five different types of sandstones were selected and freeze–thaw wet–dry and heat–cool cyclic tests were performed The freeze–thaw test was carried out for 30 cycles and the P-wave

Furthermore influence of compaction state and drying-wetting cycles on evaporation rate and cracking of BAS has not been investigated comprehensively The objective of this study was to investigate the effects of biochar types compaction state of BAS and drying-wetting cycles on crack propagation and retained water (or evaporation rate)

Nov 01 20172 2 Soil incubation We determined the effect of four DRW cycles on MBC K 2 SO 4-extractable organic C (EOC) and microbial respiration rates with the incubation experiment consisting of four soils and two treatments (DRW and constantly moist) Following the pre-incubation MBC and EOC were measured with three replicates at the beginning of the incubation experiment

WEATHERING BY WETTING AND DRYING: SOME EXPERIMENTAL

A series of experiments on sandstone and dolerite was undertaken in an attempt to better understand the wetting and drying weathering process As rock samples are frequently subjected to wet–dry cycles within the simulation of other weathering mechanisms (e g freeze–thaw) three common methods of moisture application were used and the

Nov 13 2014The effects of wet–dry freeze–thaw and heat–cool cycles on the physical and mechanical properties of Upper Red Formation sandstones located southwest of Qom central Iran were determined Five different types of sandstones were selected and freeze–thaw wet–dry and heat–cool cyclic tests were performed The freeze–thaw test was carried out for 30 cycles and the P-wave

Aug 28 2020As shown in Figure 5 the specimens after the 182- and 364-day wetting–drying cycle tests were removed from the cistern and stored for 7 days before sampling to complete an entire wetting–drying cycle Once the 182- and 364-day wetting–drying cycle tests had been completed the beams were cut to obtain concrete powder samples for the

A series of experiments on sandstone and dolerite was undertaken in an attempt to better understand the wetting and drying weathering process As rock samples are frequently subjected to wet–dry cycles within the simulation of other weathering mechanisms (e g freeze–thaw) three common methods of moisture application were used and the

Furthermore influence of compaction state and drying-wetting cycles on evaporation rate and cracking of BAS has not been investigated comprehensively The objective of this study was to investigate the effects of biochar types compaction state of BAS and drying-wetting cycles on crack propagation and retained water (or evaporation rate)

Furthermore influence of compaction state and drying-wetting cycles on evaporation rate and cracking of BAS has not been investigated comprehensively The objective of this study was to investigate the effects of biochar types compaction state of BAS and drying-wetting cycles on crack propagation and retained water (or evaporation rate)

The results show that surface of specimen in 5% and 10% solution shows obvious desizing sandiness and some crack at 75 drying-wetting cycles In different solution concentration mass of specimen shows a trend to increase firstly then decrease lately and different drying-wetting cycles(20 30 40and75) Influence of cycle number and

To investigate the impact of repeated dry-wet cycles on soil CO 2 efflux we are conducting a precipitation manipulation experiment in a temperate Austrian beech forest Roofs exclude rainfall and simulate drought periods and heavy rainfall events are simulated with a sprinkler system We apply repeated dry-wet cycles in

Furthermore influence of compaction state and drying-wetting cycles on evaporation rate and cracking of BAS has not been investigated comprehensively The objective of this study was to investigate the effects of biochar types compaction state of BAS and drying-wetting cycles on crack propagation and retained water (or evaporation rate)

The overall influence of drying/wetting cycles depends on the weights of the three factors For the specimens subjected to drying/wetting cycles the cyclic shear strength increased with the increasing of loading frequency Scanning electron micrographs show that soil particles were drawn closer together during the drying/wetting cycle process

Since most of expansive soil slopes exhibit shallow landslide undisturbed and remoulded expansive soils of Nanning outer ring are specially selected to carry out contrast tests Through the well-designed test program by improving the conventional sample preparation conditions and methods of direct shear tests laboratory simulation of soils under seasonal drying shrinkage and wetting