Lub teeb yuag qhob ntxiv | Kev Ua Haujlwm Siab Ua Foaming Cov Neeg Sawv Cev Rau Cov Khoom Siv Ntawm Tes
concrete foam agent is a chemical additive that is added to cement mixtures to form foam. It is used in various applications and for different reasons such as to improve workability and compressive strength of the foam concrete, and to reduce water consumption.
Foaming agents have a strong impact on the density, porosity and stability of foam concrete [2,3,57]. They are either synthetic or protein-based.
Protein-based agents have a stronger pore structure and more closed void space network, which increases the durability of the foam concrete. They also prevent blisters from coalescing, and they increase the fluidity of the foam concrete.
Synthetic foaming agents have a weaker pore structure and less closed void space network, uas ua rau muaj kev ruaj khov qis dua. Lawv kuj ua rau nyias-phab ntsa ua npuas ncauj thiab huab cua void network tsis xwm yeem.
Kom qhuav shrinkage ntawm ua npuas ncauj pob zeb kuj tseem cuam tshuam los ntawm cov qauv pore. Nws tuaj yeem txo qis los ntawm kev siv cov coir fiber ntau uas tsis tshua muaj thermal conductivity hauv cov npuas ncauj. Nws tseem tuaj yeem txo qis los ntawm kev siv RCA geopolymer es tsis txhob siv cov xuab zeb, uas muaj qhov sib npaug thiab nce pore faib.
Cov qauv pore ntawm ua npuas ncauj pob zeb yog txiav txim siab los ntawm tus nqi ntawm cov tshuaj txhuam, w / c piv thiab hom kev sib sau ua ke. Qhov uas hla pore thiab kev faib tawm ntawm qhov hws cuam tshuam rau kev nqus dej.
Compressive zog ntawm ua npuas ncauj pob zeb yog cuam tshuam los ntawm w / c piv thiab cov khoom zoo sib sau ua ke. Nws yog qhov tsis zoo cuam tshuam los ntawm w / c piv saum toj no qhov kev txwv zoo tshaj plaws thiab tsim cov nyias-phab ntsa thiab tsis xwm yeem ua npuas ncauj. It is also affected by the use of superplasticizer, which increases the pore diameter and decreases the w/c ratio.