China Lightweight Concrete AAC Block Brick Making Machine Keda AAC Plant Solution

WHAT IS AAC?
The AAC production process includes raw material preparation, batching and mixing, pouring, precuring, cutting, autoclaving, and packing. With decades of experience in serving the AAC blocks production machinery industry, we can supply customers with quality AAC block production lines with capacity ranging from 80,000m3 to 400,000m3 per year.

Chart 1 the parameter of the processes

ProcessesParameterMixing period5-6 minutesPouring slurry temperature40-45ºCCake curing time2.5-3.0hCake curing temperature45~55ºCCake strength after curing0.15~0.18MPaAutoclaved curing system Before-after autoclave0.5hVacuumize0.5h(0~-0.06MPa)Listing pressure1.5h(-0.06~1.3MPa)Constant pressure8h(1.3MPa)Releasing pressure1.5h(1.3~0MPa)total12h

RAW MATERIALS
Siliceous materials : Sand / Fly ash / Tailings containing silicon / Ceramic waste
Calcareous material: Lime block + cement + gypsum
Others: Aluminum powder paste
THE ADVANTAGES OF AAC:

1. Low density : Can be 325kg /m3

2. Good thermal insulating properties

3. Cost few time to build, saving time

4. Easy to operate , saving labor cost

5. Good performance of preventing fire

6. Good sound-insulation properties

7. Durable , anti-seismic , recyclable

CUTTING SYSTEM
Special cutting design : All the steel wire columns are fixed on two main oblique beams of cutting machine and each pair of the columns is used to fix only one steel wire , so that the horizontal cutting machine can avoid the settlement cracks problem in thin block and panel cutting , and achieve the minimum horizontal cutting thickness of 50mm block out of a whole mould. The integral swing frame of the vertical cutting machine can ensure the side plate replacement , the cutting action can be synchronized with ferry replacement. With automatic detection system . the broken wire can be timely detected.
PACKING SYSTEM
Automatic packing system can realize the automatic rotation stacking and splicing of blocks and realize the packing function with pallet or non-pallet. The stacking specification can realize 1.2mx0.6m 1.2mx1m 1.2mx12m 1mx0.6m multiple stacking , and the height of the stacking can be 1.2m, 1.5m , 1.8m and 2.4m.
AAC FINAL PRODUCTS1. Product classification
Product classification is according to national standards GB/T 11968-2006 AAC block, also can be according to user's requirements to produce product with special specifications size.

Chart 2 Specification & Index

NameAAC blockWeight300~600 Kg/m3(control led by formula)After autoclave compressive strengthaverage value≥3.5MPa, Min. value<=2.8MpaDrying shrinkage valueMeasured under condition of rapid method≤0.8mm/m;Measured under condition of standard method≤0.5mm/mFrost-resistanceAfter the cycle of freezing and thawing for 15 times,weight loss≤ 5%,strength loss≤ 20%Coefficient of thermal conductivity≤0.14~0.16W/m.k

2. The block is classified by compressive strength and volume density.
Strength level: A1.0, A2.0, A2.5, A3.5, A5.0, A7.5, A10.
Dry density level: B03, B04, B05, B06, B07, B08.

3. Block level
The block is divided into high-class(A), first-class(B), qualified product (C) according to the size variation, appearance quality, dry density, compression strength & frost-resistance.

4. AAC Block indicator
Chart 3 Size variation& appearance

ProjectIndicatorHigh-class
(A)Qualified product
(B)Permissible variation of dimension
mmLengthL±3±4WidthB±1±2HeightH±1±2Missing angleThe min. size not more than /mm030The max. size not more than /mm070Missing angle no. larger than the above size, not more than02Crack lengthThe crack length through one edge and two surfaces not more than crack directional size sum on crack surface01/3The crack length of any surface can not be larger than crack directional size01/2The cracks larger than the above size, not more than030The depth of cracking, sticking, damage can not be more than/mm01030Plain bendingNot allowedSurface porosity, lamination crackNot allowedSurface oilNot allowed

Chart 4 Cubic compression strength for block

Strength levelCubic compression strength (MPa)Average not less thanSingle group min. not less thanA1.01.00.8A2.02.01.6A2.52.52.0A3.53.52.8A5.054.0A7.57.56.0A10.0108.0

Chart 5 Dry density for block(kg/m3)

Dry density levelB03B04B05B06B07B08Dry densityHigh-class (A)≤300400500600700800Qualified product (B)≤325425525625725825

Chart 6 Strength level for block

Dry density levelB03B04B05B06B07B08Strength levelHigh-class (A)≤A1.0A2.0A3.5A5.0A7.5A10.0Qualified product (B)≤A2.5A3.5A5.0A7.5