Dešifrirajte količino cementa v penastem betonu

What are the raw materials of penast beton?

Glavne sestavine penastega betona so cement, leteči pepel, kremenčev dioksid, vlaknine, itd. Some proportions have more cement content, and some proportions have less cement proportions, so specific problems must be analyzed in detail. Because foamed concrete is mostly cured under normal temperature conditions, in dodana je velika količina pene, these two factors determine that its cement ratio will be higher.

What is ALC?

ALC is the abbreviation of autoclaved lightweight concrete, which is a kind of high-performance autoclaved aerated concrete (ALC). ALC board is made of fly ash (or silica sand), cement, apno, itd. kot glavne surovine, and is cured by high-pressure steam to form a porous concrete sheet (containing processed steel reinforcement). ALC board can be used as wall material and roof panel. It is a new type of building material with superior performance. ALC board first appeared in Europe, and Japan, Europe and other regions have more than 40 years of production and application history. Trenutno, the production technology and production equipment of domestic manufacturers are mainly imported from Japan and Germany.

Foam concrete is fundamentally different from ALC. Because ALC adopts autoclave, v glavnem se zanaša na reakcijo hidratacije letečega pepela in apna pod visoko vročino in pritiskom, da povzroči geliranje. Cement is an auxiliary material.

While foam concrete is produced at room temperature, the active microaggregate will not quickly produce hydration reaction, in njegova trdna pena je še vedno odvisna od cementnega učinka cementa. Zato, the mixing ratio of foamed concrete must be cement as the main body, in visoko razmerje cementa.

V normalnih okoliščinah, the amount of cement should account for more than 30% celotne količine suhih materialov, in 30% should be the minimum use amount for its normal temperature curing. Pri vlivanju na mestu, naj bi delež cementa predstavljal več kot 60% vseh suhih materialov. Za normalno temperaturo penastega betona z gostoto pod 600 kg/m3, delež cementa ne sme biti manjši od 70% celotnega materiala. Ko je gostota pod 400 kg/m3, the conventional proportion should account for more than 90% celotnega suhega materiala.

The following factors should be considered in the design of cement ratio:

(1) The variety of cement. Vrste cementa z visoko zgodnjo in pozno trdnostjo (kot je dvojno stabilen portlandski cement) lahko ustrezno zmanjša delež cementa, in vrste cementa z nizko pozno trdnostjo ali nizko zgodnjo trdnostjo morajo povečati delež cementa;

(2) Strength grade of cement. High-strength grade cement (kot npr 42.5, 52.5, itd.) can reduce the proportioning amount, cement z nizko trdnostjo pa bi moral povečati količino sorazmerja;

(3) The quality of cement. For large plants’ new dry-process rotary kiln cement, the mixing ratio can be appropriately reduced, while for small plants, shaft kiln cement or cement with a large mixing ratio should be appropriately increased;

(4) Density and strength requirements of the product. Zahteve glede nizke gostote ali višje trdnosti bi morale povečati razmerje cementa, visoke zahteve glede gostote ali nižje trdnosti lahko zmanjšajo razmerje cementa;

(5) Initial growth temperature. Začetna temperatura strjevanja po vlivanju (nalivanje) je nižja (<25°C). The proportion of cement should be increased. When the initial curing temperature is high (25℃-45℃), the proportion of cement can be appropriately reduced. If steam curing or autoclave is used, it is still strong to reduce the proportion of cement;

(6) Variety and activity of active micro-aggregate (primes). Z uporabo visokoaktivnih mikroagregatov lahko zmanjšamo delež cementa (kot je ultrafina žlindra), ob uporabi nizkoaktivnih mikroagregatov (kot je sekundarni leteči pepel) lahko poveča delež cementa.

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