Abstract
The scope of the Nordtest method is to evaluate the moisture buffer value (MBV) for materials exposed to indoor air. The test is intended to simulate daily variations with relative humidity (RH) of 75% during 8 hours and 33% during 16 hours.Many authors have noted that clay plaster has a very good MBV (Altmäe et al. 2019). Our previous tests have shown that the MBV of clay plaster can be increased by adding paper plaster mixture (Nutt et al. 2020a). The specimen made according to a recipe contains the following: waste paper, glue, clay plaster mixture and water. Eleven paper plaster mixtures with different percentages were used.Test results showed that a large percentage of paper in the plaster increases the MBV. An impressive result, which needs to be studied further, was that the MBV was the highest in the mixture that consisted of 80% paper.
Highlights
The results of previous laboratory studies of the moisture buffer value (MBV) of interior finishing plaster made of wastepaper (Teearu 2018) portray that the paper plaster MBV is 109 excellJeonurtna(lMof SBuVsta>in2ab.0le A=rch„iteexctcureelalendnCt“iv)il Eanngdinetehrineg MBV of the compo20s2i0te/2/m27aterial made of paper and clay is higher than the MBV of clay plaster (Nutt et al 2020)
Our experiment showed that adding paper to clay plaster1m. ixMtuBreVs cihnacnrgeeasstehsewhyhdernothaedrdminalgpproappeerrtiepslaosfttehremclaixytpulraestteor mcliaxytuprel.aTshteerremsiexatruchre. determ2in. edAthdadtiandgdinegvepnapear pslmasatellr taomcloauy npltasotferpinacpreearseind ththeeMBmVixotfuthree phlaasstear.n impact on the MBV by Our hy3po. thiMensceBrsVe: asdienpgeint.ds on the amount of paper used
The results of the study introduced in this article confirmed that by adding paper to clay plaster mixtures, the MBV of clay plaster is increased, which creates an opportunity to improve the properties of natural clay plaster and to improve the indoor climate of living spaces when using the created composite material
Summary
The results of previous laboratory studies of the MBV of interior finishing plaster made of wastepaper (Teearu 2018) portray that the paper plaster MBV is 109 excellJeonurtna(lMof SBuVsta>in2ab.0le A=rch„iteexctcureelalendnCt“iv)il Eanngdinetehrineg MBV of the compo20s2i0te/2/m27aterial made of paper and clay (clay plaster mixture) is higher than the MBV of clay plaster (Nutt et al 2020). OuOr uhryphoythpeostisheissebsa:sed on our research (Nutt et al 2020) about the hygrothermal performance of clay-sand plaster and paper mixtures MBV. _ Adding even a small amount of paper in the mixture has an impact on the MBV by increasing it. The specimen was made according to the recipe that contains: wastepaper (newspaper paper), glue (methylcellulose), clay plaster mixture and water. Composition: paper + clay plaster + glue + water, material with homogenous structure. Dates of test 3: 17.08.2019 - 25.08.2019 Nordtest results describe the moisture absorption and separation of plaster mixtures, which is expTrehsesreedsublytsan index MBV. Materials can be classified as follows: negligible (0-0.2), limited (0.2-0.5), moderate (0.5-1.0), good (1.0-2.0), and excellent (2.0-) (Rode 2005)
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