Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Desiccation cracking of polymer-bentonite mixtures: An experimental investigation
Abstract Despite some evidence that polymer addition may enhance the resistance of clay to desiccation cracking, the topic remains under-researched. This study evaluated the effect of sodium carboxymethyl cellulose (Na-CMC) additive on the formation of crack patterns in bentonite clay undergoing dehydration. Thirteen groups of amended and unamended mixtures, prepared with two different mixing methods and several Na-CMC types and dosages, were exposed to air dehydration in petri dishes under different environmental conditions of temperature, humidity and friction. Moisture loss was tracked in real-time and surface cracking was recorded with a digital camera at regular intervals. Captured photos were analyzed by image processing to quantify crack ratio and surface area of soil clods. The results indicated that polymer-modified samples consistently exhibited reduced levels of desiccation cracking compared to unmodified ones under different environmental conditions. Na-CMC with a degree of substitution (DS) of 0.9, corresponding to peak viscosity of polymer, generated a higher resistance to cracking than DS of 0.7 or 1.2. In addition, dry mixing seemed to be more effective than wet mixing in increasing mixture resistance to desiccation cracking.
Highlights Desiccation cracking pattern of polymer-modified bentonite exposed to air-dehydration is monitored. Sodium carboxymethyl cellulose (Na-CMC) enhances clay resistance against desiccation cracking. Cracking intensity is highly dependent on degree of substitution of Na-CMC. Mixing method of Na-CMC and bentonite has a strong effect on cracking behaviour of clay.
Desiccation cracking of polymer-bentonite mixtures: An experimental investigation
Abstract Despite some evidence that polymer addition may enhance the resistance of clay to desiccation cracking, the topic remains under-researched. This study evaluated the effect of sodium carboxymethyl cellulose (Na-CMC) additive on the formation of crack patterns in bentonite clay undergoing dehydration. Thirteen groups of amended and unamended mixtures, prepared with two different mixing methods and several Na-CMC types and dosages, were exposed to air dehydration in petri dishes under different environmental conditions of temperature, humidity and friction. Moisture loss was tracked in real-time and surface cracking was recorded with a digital camera at regular intervals. Captured photos were analyzed by image processing to quantify crack ratio and surface area of soil clods. The results indicated that polymer-modified samples consistently exhibited reduced levels of desiccation cracking compared to unmodified ones under different environmental conditions. Na-CMC with a degree of substitution (DS) of 0.9, corresponding to peak viscosity of polymer, generated a higher resistance to cracking than DS of 0.7 or 1.2. In addition, dry mixing seemed to be more effective than wet mixing in increasing mixture resistance to desiccation cracking.
Highlights Desiccation cracking pattern of polymer-modified bentonite exposed to air-dehydration is monitored. Sodium carboxymethyl cellulose (Na-CMC) enhances clay resistance against desiccation cracking. Cracking intensity is highly dependent on degree of substitution of Na-CMC. Mixing method of Na-CMC and bentonite has a strong effect on cracking behaviour of clay.
Desiccation cracking of polymer-bentonite mixtures: An experimental investigation
Taheri, Sepideh (Autor:in) / El-Zein, Abbas (Autor:in)
Applied Clay Science ; 238
27.03.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Shrinkage and desiccation cracking in bentonite-sand landfill liners
| British Library Online Contents | 2001
Shrinkage and desiccation cracking in bentonite-sand landfill liners
| British Library Conference Proceedings | 1999
Shrinkage and desiccation cracking in bentonite-sand landfill liners
| British Library Conference Proceedings | 1999
Shrinkage and desiccation cracking in bentonite-sand landfill liners
| Online Contents | 2001