水泥铺路的问题

高寿财

有搀好沙石的混凝土，
$6一袋，
工程不大的话可以考虑。

bill28

高寿财 发表于 2012-9-18 16:21

有搀好沙石的混凝土，
$6一袋，
工程不大的话可以考虑。
哪里有卖？每袋可铺多少平方米？

高寿财

bill28 发表于 2012-9-18 16:44

哪里有卖？每袋可铺多少平方米？
一袋20公斤，
铺不了多大面积，
所以只适用微小工程。

purplenight

jieh 发表于 2012-9-17 12:56

75mm thick, 50mm sand bedding, provide joints at every meter
这个规模, 不用沙子了吧, 就算用最多25mm, 只要中间加个mesh就行了. 另外, expension joints every 3m(就是全断开, 完工后填filler) , saw cut every meter(就是浇混凝土的时候表面划一下, 30mm 深够了) , that is enough.
Quick Set 我用过, 75mm厚,一袋估计只能有0.2平米左右, 一袋一袋和起来很累人.

dbsdsuna

"后院想铺一条小路，只是人行走", 那就放几块水泥砖吧。

jieh

purplenight 发表于 2012-9-18 17:01

这个规模, 不用沙子了吧, 就算用最多25mm, 只要中间加个mesh就行了. 另外, expension joints every 3m(就 ...
a few points need to remind purplenight
1. minimum 50mm crushed granular/sand bedding is required for foot path
2. reinforcement is not typically required for footpath, unless regular joints are not provided.
3. if reinforcement is provided in the footpath, the minimum concrete thickness should be 100mm, unless project is located 50km away from the coast.
4. Expansion joints only required at minimum 8m intervals
please refer to C&CAA Guide to Residential Streets and Paths for details.
at the end of the day, it's just a foot path, even the owner did what ever he likes nothing big gonna happen, but when you're giving professional advice or dismissing other professionals, please make sure you are deadly right.

purplenight

jieh 发表于 2012-9-19 16:03

a few points need to remind purplenight
1. minimum 50mm crushed granular/sand bedding is required  ...
Are you a civil engineer? which state you working at?  i am working in NSW and it is part of my job to design the pavements from footpath to major roads, from flexbile pavement to rigid pavement.  I fully realize the LZ's situation and therefore gave the suggestion which is NOT sticking to any of the standards but to address the real potential issue LZ could face. It is a customized advice, not copying directly from a standard.
LZ's case has nothing to worry for the concrete strengh but should pay attention to the cracking, hence steel mesh and full expansion joint are recommended.
The 100mm min thickness concrete is only to ensure approx 50mm cover for the reo, which is only for 100yrs design life and is only needed for the major infrastructure. The min 50mm bedding layer is to ensure no concentrated load but shouldn't be worried in LZ's case. The spacing of the expansion joint is actually based on the shape of the slab, when you have narrow slabs, the spacing should be reduced, that is why i recommended saw cut joints and expansion joints as well. I am acutally not too sure whether the mesh is needed for such a small job, but what i konw is that in Sydney, most of the footpaths in public area have steel mesh in the middle of the slab. As a engineer, i am not too confident with the footpath slabs in public area without mesh but only joints.
Anyway, thanks for the reminder, i should state that my advice is not for LZ to meet any of the standards but just my engineering opinion.

vim

jieh 发表于 2012-9-19 16:03

a few points need to remind purplenight
1. minimum 50mm crushed granular/sand bedding is required  ...
非常支持你说的 最怕不懂乱讲 误导别人

jieh

purplenight 发表于 2012-9-19 17:08

Are you a civil engineer? which state you working at?  i am working in NSW and it is part of my jo ...
I am a structural engineer, to be precise, civil is like a hobby, when there is not much structural works around, I can work as an acting civil engineer, car park, access roads, rigid and flexible, storm water, i can stick my nose in most of these stuff.
I am in sydney, to be honest, most my knowledge is from the book, that's why I double checked the C&CAA design guide to make sure I am not too much over the mark. which guideline are you using for pavement & footpath? maybe we can exchange bit of information and both learn from it.

purplenight

jieh 发表于 2012-9-19 22:06

I am a structural engineer, to be precise, civil is like a hobby, when there is not much structura ...
Sounds like you are a really versatile engineer :).
I normally use the Austroads Pavement Design guide, this is the bibble for the pavement design, even the pavement specialists in our office are using this as the design standards. Most of my knowledge in pavement design are coming from the bibble and also the design experience of the other engineers. However, the Austroads design guide is mainly for the proper pavement for a decent road, not really for the light duty ones like the footpath.
The C&CAA you mentioned should be a good one to look at but just not sure whether it is a compulsory one to follow or just a guideline. In most of the case, the footpath design should following the Council's typical details which is normally 75mm thick with SL62. It is clearly different from the requirements in C&CAA as you mentioned. Based on my experience, the C&CAA design is too conservative in durability (like 50mm cover for the reo, this kind of issue has been confirmed by the material engineer in our office) but with less concern to the cracking control. The joints layout design as part of cracking control, is the hardest bit in pavement design and there are no clear guide line to follow. All my knowledge on that is from everywhere like previous design by other engineers, RTA/Council standard drawings etc.  
Sorry, we just 歪楼了。If you like, we can send message to discuss the technical issue.