Fireproof concrete

Concrete of general silicate cement cannot bear the working requirement of high temperature, in to hydrate process separate out oxyhydrogen dissolves calcium, oxidation turns into calcium below high temperature; The limestone that serves as aggregate suffers pyrolysis below high temperature, intensity is destroyed. Common concrete can be used at the place of 300 ℃ the following low temperature such as furnace foundation and chimney only. And fireproof concrete use temperature can amount to 900 ℃ above.

The composition of fireproof concrete includes to aggregate, cementation expects and be mingled makings. What expect according to what using cementation is different, can divide for silicate cement mud of fireproof concrete, aluminous acerbity brine is fireproof concrete, water glass is fireproof concrete, phosphate is fireproof concrete, magnesian qualitative fireproof concrete and clay union are fireproof and pouring makings.
The use temperature of fireproof concrete depends on aggregate and the breed amount that cementation expects. Aggregate origin is very wide, commonly usedly useless firebrick or grog of to calcine clay, anxious lapidary grog waits. Right fireproof degree of demand is higher, still have make aggregate with the material such as zirconium stone, chromic broken bits. Aggregate wants broken to certain size, deserve to compare appropriately by degree of finish cooperate. It is those who raise concrete to be able to bear or endure flake gender, wearability and thermal stability, can join refractory steel fiber. Aggregate occupies 65% ～ in fireproof concrete 80% .
Mingle stuff is ordinary the fine pink that pledges with as same as aggregate capable person, granuality is less than 0.088mm should not less than 70% . Join mingle makings can make pug mixes more easily, conduce to improve product send density, loading softening point and decrease to burn systole again. Mingle makings 10% ～ are occupied in concrete 30% .
The 7% ～ that cementation makings occupies concrete to weigh 20% . Silicate cement uses as the cementation makings of fireproof concrete, disappear deoxidize changes calcic intention. Should add cement weight the pink of fine clay grog of 100% makes 50% ～ mingle when makings, it and the siliceous calcium that oxidation calcium writtens guarantee synthesis is stabilized and aluminous acerbity calcium are mineral. Cost of this kind of fireproof concrete is low, can use in 1000 ℃ the following, temperature wave motion is not big, without the place that soda acid erodes, wait like equipment foundation, flue, chimney.
Aluminous acerbity salt is fireproof concrete is with alumina cement expects for cementation, mix for aggregate with aluminous grog mingle makings the water rigid concrete that makes. Of aluminous cement main and mineral it is aluminous acerbity calcium, to hydrate rate is very rapid, because this kind of concrete is sclerotic fast, inchoate intensity is high.
Water glass is fireproof concrete is expect for cementation with water glass, join right amount silicon fluorine acerbity natrium to coagulate as hurried the gas rigid concrete that the agent makes. The silica gel that water glass hydrolyze produces, aggregate, mingle makings join to be together. This kind of concrete strength is relative taller, but fireproof degree reach loading softening point low, apply to 1000'C to ask below relatively high strenth, wearability the good, place that can fight acid to corrode, but the place that cannot be used at often having water or vapor effect.
Phosphate is fireproof concrete is with industry phosphoric acid expects for cementation, add right amount and aluminous cement to make hurried coagulate sometimes agent and the hot rigid concrete that makes. The characteristic of this kind of concrete is knot of not sclerotic below normal temperature solid, have particular strength to make its caky, should add hurried to coagulate agent. Arrive via heating 500. Solid of C ability sclerosis writtens guarantee, intensity also rises subsequently, but near 800 ℃ , wen Jiang is spent in low it is its defect, intensity rises along with temperature again after. This kind of concrete is had the good fireproof performance, wearability, sex that fight broken bits and be able to bear or endure urgent cold urgent hot sex, can long-term application is below the condition of 1600 ℃ of 1400 ～ .
Fireproof unripe clay is pouring the good bond of makings. Because cement has more oxidation calcium in fireproof concrete, reduced its performance. 70 time develop 20 centuries succeeded clay union is fireproof and pouring makings, the principle basically is the displacement action that relies on alkaline ion, join those who contain sodium ion to decrease water agent namely, be like 3 get together natrium of phosphoric acid natrium, anxious phosphoric acid, make pouring the fluidity of makings rises, facilitate pouring construction; Join tall aluminous cement or silicate cement to make hurried coagulate at the same time agent, curdle sclerosis is accelerated. Clay union is fireproof and pouring expecting is gas rigid material, pouring hind natural conserve can. This kind pouring expect after applying on soaking furnace, heating furnace, the result is very favorable. Its defect is normal temperature intensity inferior, be dedicated to domestic and internationally nearly 10 years developing clay of low cement high strenth union is pouring makings, main trend is to join 15% ～ 20% exceed makings of fine fireproof pink.
Fireproof concrete can irrigate directly inside the pattern plate on hot project facilities, anchorage firmware is added inside, the course after tamp is certain conserve period can. Also can make prefab piece, wait like top of vault, condole, boiler setting, furnace lid, furnace door, compared bricklaying or direct and pouring shape, reach in construction when changing, go to the lavatory more.
Fireproof concrete still can develop further, because they have a few apparent characteristics:
(1) is fireproof degree as about the same as the firebrick that pledges with material, but as a result of fireproof concrete (pouring expect) without agglomeration, the first time the systole when heating is bigger, reason loading softening point compares firebrick slightly low. Nevertheless, from measure on the whole, function excel firebrick.
(The action that 2) fireproof concrete expects as a result of microtherm cementation, intensity of normal temperature compression is higher. The integral sex because of body of build by laying bricks or stones is good at the same time, the air-tightness of furnace is good, be out of shape not easily, the furnace casing armor plate outside can cancel, furnace fighting mechanical vibration and percussive function is better than body of build by laying bricks or stones. Heat up the side wall upside of furnace with Yu Jun for example, the place mechanical wear and collision are fiercer, of build by laying bricks or stones of life comparing brick rose multiple.
(3) thermal stability is good, aggregate greater part or it is clinker entirely, the contractive photograph that expands to expect with cementation is quits, the heat of the body that put build by laying bricks or stones expands to say to compare a brick relatively small, temperature stress is little also. And the crystallization look that there are states of all sorts of meshy, acicular, catenary in the structure, the capability of counteractive temperature stress is strong. Use for example pouring soaking furnace mouth and furnace lid, life is lengthened half.
(4) production technology is simple, cancelled the complex process that make a brick. Can make all sorts of prefab piece, and can mechanization construction, accelerated the rate that build furnace greatly, raise more than 10 times than bricklaying efficiency. Still can use useless brick to wait for aggregate, become useless to be benefit.
Flourish Cheng Naicai basically produces tall aluminous brick, silica brick, argillaceous brick, magnesian Luo brick, heat-insulating material, fireproof slop, pouring a series of high quality products such as makings, flourish fills a company to take consistent management concept, pursue " sincere letter, respectful modest, innovation, respect property " tenet, " cheap of qualitative actor price " the cornerstone that develops as the enterprise, will found " Rong Cheng character " as company strategy goal. Govern system, rich product type with scientific administrative technological process, perfect client information, the user that is us provides satisfactory, seasonable, efficient service.