各種想出來然後被拋棄的idea 圖

Difference between traditional grave and plant grave area

Environmental friendly brush

Compare high building with rural building

Straw mould for different material trying

small sleeping area design

Under water hotel

Precast stair frame

One way to teach efficiently(why online course)

My writing in SCMP
https://www.scmp.com/comment/letters/article/2147730/hong-kong-schools-can-use-teaching-videos-enhance-learning-process

當年我只寫邏輯， David 哥幫我改句子。

Further study

Methodology to deliver a academic concept

Teaching a learner could be divided into 2 processes:

Process (1)  to present:. Prepare a set of presentation to the learner. If the learner doesn’t know what you mean, try another presentation method.

Process(2)  to find out the misconception: When the learner raises a question,  answer the question according to the misunderstanding of the learner. 

In a class,  during the process to present, there have problems like:

Those who present the concept don’t have a good presentation skill or they don’t have several presentation methods. For some poor candidate in HK, their only presenter is their teacher. And as Hong Kong is full of tutorial class with only video talk.  It proves that a better presentation skill is existed and reflect in their examination result that thousands of candidates grasp the concept after reading the video.

So,  in a classroom, the process to present with a video of a good presenter is important.  It would confirm that the candidate can receive different good presentation before they raise their question. Lastly,  it would to a great extent, reduce the workload of a teacher.

So,  develop a standard set of video lecture for HK student is important (better in Cantonese)  to raise the number of students to know the knowledge they need. 

講解一套程序係分為

1.  向他做一套講解， 如果他不明白， 就換一種講解方法。

2. . 重覆1, 直至， 他提出問題， 就根據他不明白的地方向他講解。

而向他做一套理論， 這程序是應該被video 取代的， 好處是更易準備更多講解方法，講解方法易分享， 亦令講解方法更清晰和減小老師的負擔。巿面上已知很多主要靠視頻單向播放， 就令聽者明白並高分的補習名師， 這證明了好的講解方法本身是可以錄像的， 這另一方面更並提高了老師的生產力。

在香港中小學群體裡面， 很多學生可能不能接受到較好的， 或不能接受到不同的講解方法。 但對好些低收入家庭的學生而言， 他們唯一的教授者只有老師。

所以香港很有需要建立一套自己的標準課題講解方法(最好是母語，因為很多學生沒機會學好英文) ,以讓更多學生公平地接受教育。

Mix concrete method cantonese

有效率的手撈石矢教學

首先，場地的石仔和沙應該擅起，避免和地上的粉塵混合，

石仔,和沙要分開，不能有部份預先混和。

首先石屎唔同grade 有個 英泥, 沙, 石既比例，通常用重量來計。

以C30 石矢來做例子:

例如， C30 的混合成份比例大致是

重量 比例:

英泥: 沙: 石: 水 = 1 : 1.5 : 2.75 : 0.5

1+1.5+2.75+0.5= 5.75   

假設石矢搞伴機每次搞的體積是1 m^3

那需要 (設石矢質量重: 2400 kg/m^3

英泥: 1*2400/5.75*1 = 417.4 kg,

沙: 1*2400/5.75*1.5 = 626.1 kg,

石: 1*2400/5.75*2.75 =1148 kg,

水: 1*2400/5.75*0.5 = 208.7 kg

如是者，如需要 0.108 m^3 的 石矢

就需要英泥:  417.4 * 0.108 m^3 = 45kg

沙: 626.1 kg * 0.108 m^3 = 67.6kg

石: 1148 kg * 0.108 m^3=124.0kg

水: 208.7 kg * 0.108 m^3 = 22.5kg

然後，按比例在膠筒中刻上每樣物料到達某一高度時的重量，即用volume 決定物料的數量，再直接放入搞伴機中或加入麻包袋運輸，到了現場再根據比例去決定放多小包物料比例。

例如， 英泥，在膠筒上的22.5kg 高度，會配上2包在膠筒上16.9kg 高度的沙，4包在膠筒上的15.5 kg 高度的石，3筒在膠筒上3.75kg 的水。

放物料入搞伴機，加入物料次序就主要 先 落石仔，再倒2/3的水，搞10秒，再落沙，搞30秒，最後落英泥，搞2分鍾(搞伴器的大小不同可能有區別)。愈大粒的物料在加水過程中，水會黏在其表面，幫助水份平均散佈在之後的物料中，先加英泥的話，英泥混合後會黏在一起，影嚮往後和英泥或沙的混合。

最後，量度英泥的slump，合格的話就可以落了，slump 不夠的話，再慢慢補上另外1/3的水，直至slump 合格為止。  搞的方法經驗可能有點不足，希望有人補充。

通常 3種物料價錢差唔遠，比左個比例同方法佢佢地較小偷工減料。
很久以前的G.S. 表示。slump  超出 75 如有engineer 批可以落。

英泥質量: 3150 kg/m^3 (根據香港政府文件 Issue No. : 5/2018)

沙(fine aggrgate)質量: 1337kg/m^3 (參考)

3分石仔(Coarse aggregate)質量: 1435kg/m^3 (參考)

英泥: 沙: 石 : 水 = 3.175 x 10^-3 : 1.122 x 10^-3 : 1.916 x 10^-3 : 0.5 x 10^-3

Euler Manual to promote canotnese


Refer to :
http://advancedcivilengineering.blogspot.com/2011/10/concrete-mixed-design-method-bs-method.html

Procedures of Design Mixing

Production of Trial Mix Design

1. The volume of mix, which needs to make three cubes of size 100 mm is calculated. The volume of mix is sufficient to produce 3 numbers of cube and to carry out the concrete slump test.
2. The volume of mix is multiplied with the constituent contents obtained from the concrete mix design process to get the batch weights for the trial mix.
3. The mixing of concrete is according to the procedures given in laboratory guidelines.
4. Firstly, cement, fine and course aggregate are mixed in a mixer for 1 minute.
5. Then, water added and the cement, fine and course aggregate and water mixed approximately for another 1 minute.
6. When the mix is ready, the tests on mix are proceeding.

Reduce the concrete waste

For the abandoned fresh concrete in construction site, normally, it is dumped on site and griped to the landfill. It is obviously a waste of energy, material and cost in the process to produce, transport and dump it. Some foreman may give 1-200 HKD$ to the driver and illegally let the driver dump to other country part area, rural area for the villager to place in a car parting area,or fill the pond in rural area. 

I think there is a better way to improve it. Such as the government should make some precast mould in the construction project. So that we can make use of the abandoned fresh concrete. Like precast chair, breach... whatever creative product.

Or the client could open a WhatsApp group. A works supervisor in different construction site should show their contact in this WhatsApp group. They take responsibility to publicize the concrete pouring date and quantity of abandoned fresh concrete in the WhatsApp group. So that citizens can contact the driver to buy the “waste”.