墻體彩色水泥 地坪彩色水泥 耐磨性好

水泥簡介

? ? ?水泥，是以鋁礬土和石灰石 氧化鋁粉為原料，經煅燒制得的以鋁酸鈣為主要成分、氧化鋁含量約50%的熟料，再磨制成的水硬性膠凝材料。高鋁水泥常為黃或褐色，也有呈灰色的。具有快硬、早強、耐腐蝕、耐高溫的水硬性膠凝材料；它既是一種優質的建筑材料，也是一種膠凝性散狀耐火材料，在冶金、建材、石油化工、電力、食品等行業有著廣泛的應用。

鋁酸鹽水泥凝結硬化速度快。 1d強度可達**高強度的80%以上，主要用于工期緊急的工程，如國防、道路和特殊搶修工程等。

鋁酸鹽水泥水化熱大，且放熱量集中。1d內放出的水化熱為總量的70%～80%，使混凝土內部溫度上升**，即使在－10℃下施工，鋁酸鹽水泥也能很快凝結硬化，可用于冬季施工的工程。

鋁酸鹽水泥在普通硬化條件下，由于水泥石中不含鋁酸三鈣和氫氧化鈣，且密實度較大，因此具有很強的抗硫酸鹽腐蝕作用。

鋁酸鹽水泥具有**的耐熱性。如采用耐火粗細骨料可制成使用溫度達1300～1400℃的耐熱混凝土。

但鋁酸鹽水泥的長期強度及其他性能有降低的趨勢，長期強度約降低40%～50%左右，因此鋁酸鹽水泥不宜用于長期承重的結構及處在高溫高濕環境的工程中，它只適用于緊急軍事工程、搶修工程、臨時性工程，以及配制耐熱混凝土等

鋁酸鹽水泥包括鋁酸鈣、鋁酸鋇、鋁酸鋇鋯三種水泥。其中鋁酸鋇水泥具有快硬、高強度、耐火度高等特點。

特性指標

?

單位

量值

****

GB201-2000中CA50規定

比表面積

SSB

㎡/kg

369

≥300

?

化學成分

SiO2

%

7.41

≤8.0

AL2O3

%

51.10

≥50

Fe2O3

%

2.19

≤2.5

R2O

%

0.32

≤0.4

凝結時間

初凝IS

分鐘

166

≥30

終凝FS

分鐘

223

≤360

抗折強度

**

Mpa

7.2

≥5.5

三天

Mpa

7.7

≥6.5

抗壓強度

**

Mpa

51.9

≥40

三天

Mpa

60.6

≥50?

高鋁水泥用途

? ? ??高鋁水泥又稱為鋁酸鹽水泥 耐火水泥，相當于625#水泥，因其具有優良的快凝，高強，耐高溫之特點，**強度可達80%，耐火度可達1450度，耐火混凝土強度可達55MPa,是工業窯爐工程中**的高溫結合劑材料之一。

High alumina cement
High alumina cement, also known as alumina cement, refractory cement, aluminate cement, collectively referred to as aluminate cement, is with bauxite and limestone as raw material, the calcination of calcium aluminate as main ingredients, alumina content is about 50% of the clinker, grinding is made of water hydraulic cementitious materials. High alumina cement is often yellow or brown, there is a gray. With rapid hardening, early strength, corrosion resistance, resistance to high temperature of the water hydraulic cementitious materials; it is a kind of high quality building materials and a cementitious powder shaped refractory material, in the metallurgy, building materials, petrochemical, electricity, food and other industries has a widely used.
Production requirement of high alumina cement
1, fineness: the finer the cement particles, the larger the surface area, the faster the more full hydration, early and late strength are higher. State regulations: the specific surface area should be more than 300 square meters / kg, otherwise not qualified.
2, setting time: in order to guarantee in the construction have plenty of time to finish the mixing, transportation, molding, and other various process, cement and its initial setting time shoulds not be too short; after the completion of construction, hope cement as soon as possible hardening and strength, therefore the end coagulation time shoulds not be too long. Portland cement at the beginning of the first set of time shall not be earlier than 45 minutes, the final setting time shall not be later than 390 minutes.
3, volume stability: cement paste in the coagulation process of volume change uniformity called the volume stability of cement. If the volume change is not uniform, that is, the volume stability is poor, prone to warping and cracking, reduce the quality of the project and even the accident.
4, refractory cement baking refractory cement lining baking, must pay attention to the following matters:
1) at room temperature 350 degrees, the most likely to cause local burst, to pay special attention to the slow baking. If there are still a lot of steam after the 350 degree heat, still should slow down the speed of heating.
2) in the condition of bad ventilation, water vapor is not easy to discharge, to properly extend the heat preservation time.
3) when using heavy oil for baking, to prevent oil sprayed on the surface of the furnace lining, to prevent local burst.
4) when using wood baking, direct contact with the flame is often caused by local heating too fast, should be protected.
5) to the new cast of refractory cement, at least through the 3D can be carried out after baking.
6) for refractory cement lining should also slow cooling, avoid forced ventilation.
High alumina cement application
High alumina cement and sulphoaluminate cement refractory cement, equivalent to the cement 625 Because of its excellent fast setting, high strength, resistance to high temperature characteristics of that day intensity can reach 80% and refractoriness up to 1450 degrees, refractory concrete strength up to 55MPa, is one of the industrial furnace engineering excellent high temperature binder material.