Plaster system based on rice, calcium hydroxide (air or slaked lime) and (mineral) aggregates, as a low-pollutant, resource-conserving and vapor-permeable interior plaster

Abstract

They are to be protected 1. The thermal processing of rice or rice flour 2. The digestion of thermally processed rice or rice flour with calcium hydroxide

Description

The background

[0001] Sustainable construction is more relevant than ever! I've been working with this topic for decades and can draw on a wealth of experience. My intensive study of old master painting techniques forms the basis of my understanding of the complex topics of supports, primers, paints, and finishes, as well as their interaction and relationship with one another. The construction of a single-family home and several renovations of old buildings with ecological considerations, including wood, clay, straw, and lime putty, have provided me with adept handling of these building materials. The product

[0002] Inspired by traditional, centuries-old techniques that use lime (slaked lime) to break down organic materials (e.g., casein), I developed a rice-based plaster that is less energy-intensive than hydraulic plasters (cement and gypsum plasters), easy to apply, and virtually waste-free, while achieving a more robust final strength than clay plasters. Its effect on the indoor climate appears comparable to that of clay. The plaster is, in principle, applicable to all common substrates—with appropriate pretreatment, if necessary.

[0003] Building with clay and wood is now well-known and in demand. The possibilities offered by pure quicklime have largely been forgotten. For one thing, it is used practically only in restoration or, at most, as an additive (for hydraulic plasters and mortars), and for another, true put lime has become rare. Yet it is technically far superior to dry slaked hydrated lime.

[0004] My experiments have produced practical results that can be further optimized, especially with regard to larger-scale use and marketing. The principle of "RICEUP" involves the digestion of rice flour with lime putty. This technique was used as mortar in the construction of large sections of the Great Wall of China. There is still little scientific research on this topic; what is striking is the apparent durability, particularly due to the interaction of the lime with rice-typical polysaccharides; the processes involved are still largely unknown.

[0005] Its use as plaster is not known to me.

[0006] The few available studies indicate that the special form of rice starch (amylopectin) leads to a much denser - and therefore more resistant - crystallization of the lime during carbonation. Production

[0007] In my experience, the "rice binder" is relatively easy to make (although so far only fresh on the construction site). Air-lime mortar or plaster sets quite quickly, after just a few hours. The actual setting (carbonization) takes several months. This results in virtually no waste on the construction site: Even after setting, the plaster can be repeatedly stirred with a little water, if necessary, for several days and easily processed further (thixiotropy).

[0008] The energy consumption appears to be lower overall compared to cement-based mortars / plasters and gypsum: Lime putty is obtained from limestone by firing it at approximately 900°C. The digestion of the rice requires some energy, but relatively little lime. Cement, on the other hand, is fired at approximately 1400°C with similar aggregate ratios. Gypsum is fired between approximately 300 and 1100°C, depending on the quality, and is usually processed without aggregates.

[0009] Rice is a renewable resource! Large-scale production could utilize waste (cargo and broken rice, milling dust).

[0010] In addition, the rice binds certain amounts of carbon in the plaster / mortar. processing

[0011] "RICEUP" can be applied to mineral substrates similar to a bonding mortar or lime-cement plaster. (Inorganic) reinforcement is advantageous. The product's thixiotropy facilitates application, as there is no "setting time pressure." After setting, the surface can be rubbed, smoothed, or textured as usual. Curing occurs within a few days, depending on layer thickness, temperature, and humidity; if necessary, the surface should be kept moist, which promotes the carbonization process. Complete carbonization can take several weeks.

[0012] The finished plaster can be designed, in particular, with lime paints. The use of conventional emulsion paints is possible, but not recommended, as this reduces the positive properties (permeability). Advantages of RICEUP: • Easy to process (with a little practice, even by laypeople) • Good indoor climate, pleasant feel, pleasant, barely perceptible smell • Attractive natural look, variable surface • Virtually no waste on the construction site • Low in pollutants • Sustainable production • (Possibly a significant carbon sink) • Does it serve the zeitgeist and customer demand for environmentally friendly construction, “Product of the Year”, PR campaigns, good marketing opportunities? Sources for the original mortar (Great Wall of China):

[0013] www.spektrum.de www.spiegel.de www.reibereich.de

Claims

[] Should be protected 1. The thermal processing of rice or rice flour 2. The digestion of thermally processed rice or rice flour with calcium hydroxide