In this study, the drying shrinkage cracking characteristics of concrete containing 30% fly ash were investigated for various dune sand (DS) replacements and unit water contents. results compressive strength, mixture with a DS-to-fine aggregate (DS/FA) ratio 10% showed highest value, which was 17.6% higher than lowest value. However, in restrained cracking, mixtures DS/FA 20% crack resistance, ...

This paper aims to develop a high precision variable dielectric constant capacitor detector for mechanical sand water content testing. The non-contact on-line test method can effectively solve the problems of low repeatability data, large hysteresis error and poor linearity due non-uniform content. In terms hardware, CAV444 is high-precision integrated chip, which matches corresponding circuit....

The Densu River Basin has come under serious threat from a number of human activities such as farming, lumbering, sand winning, animal grazing, dam construction among others. These activities have significant implications on the fluvial processes of the river such as erosion, braiding and flooding. The study examined the current fluvial processes and landforms and the dynamics in the river morp...

Slow sand filters (SSF) are a simple water treatment technology providing an important alternative to conventional drinking treatment. SSF extensive in terms of carbon cost and chemical use but require large land area complex operate, as periodic cleaning is required prevent filter clogging. Therefore, redundant beds enable production occur during long downtimes. Underwater skimming (UWS) innov...

abstract recharge of aquifers by using wastewater, is one of the important and applicable ways for reusing this valuable water resource, especially in arid and semi-arid regions. as the necessity of local practices for finding the proper management strategies and optimum use of recharge systems (conforming to climate, soil, etc.), a preliminary study was carried out. three physical models were ...

This study uses a setup involving scanning electron microscopy (SEM) to examine the infiltration behaviour and mechanism of formation filter cake from sand-modified bentonite slurry. We began by determining whether can be formed using water–bentonite slurry in samples fine, medium, coarse sand (Series 1). Water–bentonite–sand slurries with different mass ratios fine (B:S) were subsequently test...

The deterioration of coastal habitats cascades to the decline associated fauna by reducing trophic resource availability, shelter from predators and nursery grounds. biogenic habitat structure, such as in kelp forests, coral reefs, mangroves or seagrass beds, often causes a local increase water flow velocity wave exposure. impact this change hydrodynamics on energy expenditure animals is largel...