Hygric properties of porous building materials (VIII): Influence of reduced air pressure

Zhou, Minghui; Li, Xiaolong; Feng, Chi; Janssen, Hans

doi:10.1016/j.buildenv.2022.109680

Cited by 8 publications

(3 citation statements)

References 35 publications

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“…Transport properties include the capillary absorption coefficient, vapor permeability, liquid permeability, and liquid diffusivity [4]. Various test methods are available to test the thermal and hygric properties of porous building materials in the full humidity range [5].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Impact of Bricks of Various Characteristics on Internally Insulated Masonry Walls in Cold Climate

Freimanis,

Blumberga,

Vanaga

et al. 2023

Buildings

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Energy consumption in historic building stock is high compared to current energy efficiency standards. The heritage value of the façade and the limited space on the external surface in densely populated urban streets limit the application of external insulation. Internal insulation can be applied instead. However, it is considered to be a riskier technology due to moisture-related damage. In addition to mold growth and wood rot, frost damage should be considered in cold climates. This study aims to assess the impact of a vapor-open capillary-active calcium silicate internal insulation system with and without adhesive glue on the hygrothermal behavior of masonry from various historic bricks in cold climates by performing numerical simulations in the software Delphin. Test results of hygrothermal properties of 40 historic brick samples were used in numerical experiments to assess the impact of a brick type, the quality of the application of calcium silicate (with or without adhesive), and the impact of cold climate on the hygrothermal behavior. Results show that temperature behavior is similar to all wall types whereas a large difference is observed in moisture behavior. The application of adhesive glue tends to reduce moisture spikes caused by rain events when compared to the same samples without adhesive. Findings only partly correspond to other studies on factors affecting moisture behavior.

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Section: Introductionmentioning

confidence: 99%

Evaluation of the Impact of Bricks of Various Characteristics on Internally Insulated Masonry Walls in Cold Climate

Freimanis,

Blumberga,

Vanaga

et al. 2023

Buildings

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“…Gypsum and cellular concrete are both known for their low hygroscopicity. These materials have low storage capacity as indicated in [12,14] for gypsum and in [28][29][30][31][32] for cellular concrete. They have low vapor permeability between 1.4 × 10 −11 and 2.4 × 10 −11 kg/(m.s.Pa) for gypsum material [13] and about 2 × 10 −11 to 3 × 10 −11 kg/(m.s.Pa) for cellular concrete [30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

“…These materials have low storage capacity as indicated in [12,14] for gypsum and in [28][29][30][31][32] for cellular concrete. They have low vapor permeability between 1.4 × 10 −11 and 2.4 × 10 −11 kg/(m.s.Pa) for gypsum material [13] and about 2 × 10 −11 to 3 × 10 −11 kg/(m.s.Pa) for cellular concrete [30][31][32][33]. Hemp concretes are highly hygroscopic, with high storage capacity and high water vapor permeability [5,17,34].…”

Section: Introductionmentioning

confidence: 99%

Effect of Air Velocity and Initial Conditioning on the Moisture Buffer Value of Four Different Building Materials

et al. 2023

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Porous materials are able to exchange moisture with the surrounding air. The more hygroscopic they are, the more they contribute to regulate ambient humidity. This ability is characterized by the moisture buffer value (MBV) which is measured under dynamic solicitations according to different protocols. The NORDTEST protocol is the most commonly-used. It gives recommendations regarding the air velocity and the ambient conditions for initial stabilization. The purpose of this article is to measure the MBV according to the NORDTEST protocol and to study the effect of air velocity and of initial conditioning on the MBV results for different materials. Two mineral and two bio-based materials are considered: gypsum (GY), cellular concrete (CC), thermo-hemp (TH) and fine-hemp (FH). Following the NORDTEST classification, GY is a moderate hygric regulator, CC is good, TH and FH are excellent. When the air velocity ranges from 0.1 to 2.6 m/s, the MBV of GY and CC materials remains constant, but the MBV of TH and FH materials is highly affected. The initial conditioning has no effect on the MBV, but has an effect on the water content of the material, whatever the material.

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On the application of buoyancy correction in the cup test measurement

Richter,

Staněk,

Kopecký

et al. 2024

Building and Environment

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Hygric properties of porous building materials (VIII): Influence of reduced air pressure

Cited by 8 publications

References 35 publications

Evaluation of the Impact of Bricks of Various Characteristics on Internally Insulated Masonry Walls in Cold Climate

Evaluation of the Impact of Bricks of Various Characteristics on Internally Insulated Masonry Walls in Cold Climate

Effect of Air Velocity and Initial Conditioning on the Moisture Buffer Value of Four Different Building Materials

On the application of buoyancy correction in the cup test measurement

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