The influence of porogene additives on the properties of mortars used to control the ambient moisture

Relative humidity (RH) is one of the most important parameters, not only influencing indoor comfort and air quality, but also impacting energy performance and durability of the envelope. To minimize health risks and discomfort, the optimal range for indoor RH lies between 30% and 60%. This experimen...

Full description

Saved in:
Bibliographic Details
Published in:Energy and buildings 2014-05, Vol.74, p.61-68
Main Authors: Gonçalves, H., Gonçalves, B., Silva, L., Vieira, N., Raupp-Pereira, F., Senff, L., Labrincha, J.A.
Format: Article
Language:English
Subjects:
Applied sciences
Buildings. Public works
Concretes. Mortars. Grouts
Dosage
Exact sciences and technology
General (composition, classification, performance, standards, patents, etc.)
Indoor
Indoor ambient moisture
Materials
MBV
Mechanical properties
Moisture
Mortar
Mortars
Optimization
Perlite
Pollution indoor buildings
Superabsorbent polymer
Superabsorbent polymers
Vermiculite
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Relative humidity (RH) is one of the most important parameters, not only influencing indoor comfort and air quality, but also impacting energy performance and durability of the envelope. To minimize health risks and discomfort, the optimal range for indoor RH lies between 30% and 60%. This experimental research reports the development of cement mortars with enhanced potential to passively adjust indoor RH levels, achievable by introducing superabsorbent polymer (SAP) and porogene additives—vermiculite (VER), and perlite (PER). Samples with 0–2wt% SAP, 0–5wt% VER, 0–5wt% PER and 21.5–43 water/solid weight ratio were produced to estimate the individual performance and optimal dosage of mentioned additives. In general, the additives showed distinct behaviors, but samples VER and PER containing 2wt% exerted less influence on the mechanical properties, while the moisture buffering value (MBV) results remained at same level of the ones of the standard and non-additivated formulation (reference mortar—REF). However, the 2SAP sample with 2wt% superabsorbent polymer predominates on most of properties, reaching the maximum MBV results, but a higher unrestrained shrinkage values and strong reduction of mechanical properties was also obtained. For that reason, the optimal SAP dosage is limited up to 1wt%, since it exerted small influence on the standard/common properties required for the mortar given it the classification of good, according to MBV determinations conducted by following the Nordtest protocol.
ISSN:0378-7788
DOI:10.1016/j.enbuild.2014.01.016