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聯系方式
  • 浙江方源建材有限公司
  • 總部地址:浙江省義烏市稠城街道洪界村
  • 銷售主管:金女士
  • 手 機:15157937974

燒結磚性能指標

[ 時間:2013-07-27 點擊:1434 ]

① 形狀尺寸。普通粘土磚為長方體,其標準尺寸為240mm×115mm×53mm,加上砌筑用灰縫的厚度,則4塊磚長,8塊磚寬,16塊磚厚分別恰好為1m,故每一立方米磚砌體需用磚512塊。
② 強度等級。普通粘土磚的強度等級根據10塊磚的抗壓強度平均值、標準值或最小值劃分,共分為MU30、MU25、MU20、MU15、MU10五個等級,在評定強度等級時,若強度變異系數δ≤0.21時,采用平均值——標準值方法;若強度變異系數δ>0.21時,則采用平均值——最小值方法。各等級的強度標準應符合下表規定值。
其具體要求如下表所示。

普通粘土磚的強度等級(MPa)
     
強度等級
抗壓強度平均值≥
變異系數δ≤0.21
變異系數>0.21
強度標準值≥
單塊最小值≥
   
MU30
30.0
22.0
22.5
MU25
25.0
18.0
22.0
MU20
20.0
14.0
16.0
MU15
15.0
10.0
12.0
MU10
10.0
6.5
7.5

 ③ 抗風化性能。抗風化性能是普通粘土磚重要的耐久性指標之一,對磚的抗風化性能要求應根據各地區的風化程度而定(風化程度的地區劃分詳見GB/T5101-1998)。磚的抗風化性能通常用抗凍性、吸水率及飽和系數三項指標劃分。抗凍性是指經15次凍融循環后不產生裂紋、分層、掉皮、缺棱、掉角等凍壞現象;且重量損失率小于2%,強度損失率小于規定值。吸水率是指常溫泡水24h的重量吸水率。飽和系數是指常溫24h吸水率與5h沸煮吸水率之比。

嚴重風化區中的1、2、3、4、5等5個地區所用的普通粘土磚,其抗凍性試驗必須合格,其他地區可不做抗凍試驗。
④ 石灰爆裂。原料中若夾帶石灰或內燃料(粉煤灰、爐渣)中帶入CaO,在高溫熔燒過程中生成過火石灰。過火石灰在磚體內吸水膨脹,導致磚體膨脹破壞,這種現象稱為石灰爆裂。GB/T5101-1998規定,優等品不允許出現最大破壞尺寸大于2mm的爆裂區域;一等品不允許出現最大破壞尺寸大于10mm的爆裂區域;合格品中每組磚樣2~15mm的爆裂區不得大于15處,其中10mm以上的區域不多于7處,且不得出現大于15mm的爆裂區。
⑤ 泛霜。是指磚內可溶性鹽類在磚的使用過程中,逐漸于磚的表面析出一層白霜。這些結晶的白色粉狀物不僅影響建筑物的外觀,而且結晶的體積膨脹也會引起磚表層的疏松,同時破壞磚與砂漿層之間的粘結。
GB/T5101-1998還規定,優等品不允許有泛霜現象,合格品中不允許出現嚴重泛霜,且不得夾雜欠火磚、酥磚和螺旋紋磚。
⑥ 質量等級。
根據國家標準GB/T5101-1998《燒結普通磚》的規定,普通粘土磚的技術要求包括形狀、尺寸、外觀質量、強度等級和耐久性等方面。根據尺寸偏差和外觀質量、泛霜和石灰爆裂分為優等品(A)、一等品(B)和合格品(C)3個等級。普通粘土磚的孔隙率約為30%,吸水率18%~20%左右,表觀密度為1800kg/m左右

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