Making And Using #Lime #Mortars

An article originally written for "Rural Wales" the magasine of CPRW

"The operation of modern #cement and lime mortar is quite different. Cements set by a non-reversible chemical action to form a solid, non yielding mass. #LimeMortars set by the absorption of #CarbonDioxide over a much longer period of time. An understanding of the chemical action of lime is therefore helpful.

"Lime is derived from #limestone or Calcium Carbonate (#CaCO3), which has been burnt in a lime kiln at over 800 degrees centigrade to produce #quicklime or #CalciumOxide (#CaO). In this process carbon dioxide and any water is driven off. Quicklime is potentially dangerous having an avid thirst for water. This process creates a lot of heat and produces #SlakedLime or #CalciumHydroxide (Ca(OH)2). Builders merchants stock this material having been reground to a fine powder and called #HydratedLime.

"The slaking process releases enough heat to cause the water to boil or spit. For this reason water must NEVER be added to quicklime. The lime must ALWAYS be added slowly into the water in a metal container. For the inexperienced builder or home craftsman, slaking is therefore not recommended.

"#HydratedLime can be used as the basis of all lime plasters and mortars. It will slowly absorb free carbon dioxide in the atmosphere and revert to #CalciumCarbonate. A triangle has therefore been completed converting the #calcium back to its original chemical form of limestone. For this reason lime mortars have the potential for #ContinuousRecycling."

Learn more:
http://www.users.callnetuk.com/~gwynedd21/home/JN/LIME.HTM

#SolarPunkSunday #SustainableBuilding #Recyclable #Reusable #LimePlaster #LimeMortar #AncientTechnology #TraditionalTechnology #SustainableBuildingMaterials #ZeroWaste

#Eggshells from agro-industrial waste for the recovery of #lime, #portlandite, and #calcite nanoparticles through the lime cycle: A circular economic approach

Highlights:

• The study proposes to obtain calcite (#CaCO3) from eggshell agro-industrial waste within a circular economy approach.
• The lime cycle can be used to transform calcite (CaCO3) into lime (CaO) or portlandite (Ca(OH)2).
• Eggshells contain trace elements that can aid in synthesizing materials for #EnvironmentalRemediation..

"Eggshells from agro-industrial waste can be used as natural source to obtain nanometric CaCO3, CaO, and Ca(OH)2 using the lime cycle. The nanometric size and the phase identification of all samples were confirmed by X-ray diffraction and FWHM. The SEM images show that CaCO3, CaO, and Ca(OH)2 from eggshells are microparticles in the form of nanocrystals, which correlate with the DLS results. The Zeta Potential varies due to the loss of CO2 when CaCO3 is converted in CaO, and for this reason, the CaO is more negative. When CaO is hydrated, the Ca(OH)2 is more stable, and these differences can be attributed to the mineral content in the samples. Eggshells naturally have different trace minerals that maintain a long calcium cycle and show variation due to a concentration effect when the CaCO3 changes to CaO. There is a notable a decrease of the trace minerals when CaO. When CaO is converted to Ca(OH)2, there is a significant decrease in trace minerals as some ions are soluble in the water during soaking. It is recommended to carry out the conversion of CaO to Ca(OH)2 under controlled conditions (low humidity and CO2). These findings can be useful to treat #AgroIndustrial waste and to develop nanotechnological applications in different fields."

Full article:
https://www.sciencedirect.com/science/article/pii/S2949839224000166

#SolarPunkSunday #CircularEconomy #ZeroWaste #NewTechnology #Remediation