Taian Taishan sintered clay brick brick landscape

Taian fired brick mud plasticity index higher the drying shrinkage of the product line rate and drying sensitivity coefficient is also higher. Determination of the degree of performance physical properties of the raw materials generally in accordance with the size of the dried sensitivity coefficients represented. 1, the particles: particles of particulate material is composed of different angles in the number of brick-making raw material content of. Great influence directly affect the composition of the raw material particles brick plasticity, and sintering shrinkage properties such as plasticity higher if the particles more details, but the greater the shrinkage, drying the sensitivity coefficients is also higher. Raw material powder particle size of less than 0.05mm, said plastic particles, particle size 0.05 ~ 1.2mm called filler particles, particle size 1.2 ~ 2mm called coarse particles (skeleton particles). Reasonable particles should be plastic particles accounted for 35 to 50% filler particles accounted for 20 to 65%, the skeleton particles <30%. 2, plasticity: raw materials plus the amount of water after mixing and grinding through practice, can molded into any shape, this feature is called plasticity, plasticity index of raw materials represent the range of moisture content changes when the plastic state, and that the degree of plastic materials its value is equal to the difference between the liquid limit and the plastic limit. 3. Shrinkage: fired brick in the drying process, combined with the evaporation of water due to the mechanical, the particles move closer to each other inside the brick, gray body volume contraction phenomenon, in this case called the drying shrinkage. This is often a percentage of the length of its original length contraction knot body to represent, called dry line shrinkage. 4, drying sensitivity: Brick containing large amounts of water during the drying process, the gradual evaporation, drying, its volume is gradually reduced. However, due to internal and external body drying speed is inconsistent, external dry fast, slow internal dry shrinkage is also consistent external shrink fast, slow internal contraction. Thus, the internal compressive stress body, body surface stretching stress, such as drying process handled properly, the green body surface will appear cracking phenomenon, a phenomenon known as dry sensitivity. Sintered paving brick is widely used in the fields of very wide, to our lives, production has brought a lot of convenience. Today to introduce the classification of knowledge of the product, I hope you can read them carefully. 1, Class R bricks: for road subgrade material with high strength, such as concrete or asphalt roadbed. Class R pavers minimum average compressive strength to reach more than 600, more than 800 general requirements, such as sintered paving slabs to improve the overall track bed and subgrade compressive strength play a key role. Class R paving material thickness of the thinnest dimension of 50 mm. 2, as opposed to F bricks, it is a more rigid sintered paving bricks, more suitable for flexible foundation or without the support of tiled horizontally, for example, after the screening of Giza in subgrade compaction prepare stable Shop high strength bricks. This requires paving materials F class than the class R materials to achieve a higher compressive strength. General requirements for the minimum average compressive strength value of 10 numbers. Class F paving materials must meet not less than 80 mm in thickness. 10 to prevent the emergence of sintered brick frost is an urgent need to address the problem. Based on our experience in construction in the country, in order to prevent the emergence of shale brick frost, you should pay attention to the following aspects: First, the construction of: (1) the cement used in construction should use regular manufacturers of Portland cement, You should not use non-regular manufacturers of slag cement. (2) should be used in the construction of water for the river, you can not use water. If you use in the construction of water, seawater containing salt will cause frost brick surface. (3) sand used in the construction of river sand should avoid the use of sea sand. If the tile works appeared on the frost, the most commonly used method for hydrochloric acid clearance method. Namely with 2% hydrochloric acid to remove frost on the brick surface. Second, an appropriate increase in the calcination temperature permitting, an appropriate increase in the calcination temperature products. Provide the following data: when calcination temperature 9500C, desulfurization rate is only about 50% of total sulfur; and fired brick calcination temperature when 10500C, desulfurization rate of up to 83% of total sulfur. The more desulfurization, the more light hoarfrost. In addition, magnesium sulfate during 9710C, just lh, to fully react with the silica to form insoluble silicate brick firing water pan and frost. Calcium sulfate in 1097-11170C when you need to react with baby dioxide to produce water-insoluble calcium arsenate. Third, the increase in raw material for the manufacture of raw materials fineness finer granularity, the more beneficial when fired brick desulfurization temperature calcination, the Pan-anchor the lighter products; whereas the more coarse granular material, the more detrimental when fired brick desulfurization temperature calcination, the product The heavier fired brick. Note: If using regular manufacturers of Portland cement, brick sintering does not appear on the basic frost, if you are using slag cement, the brick of frost is more serious.