Topic: Call for jameschen6(梦想农庄-雨水多好). Would you like to discuss HPB since the Topics in "Beatifull Household"? @华人论坛:枫下论坛 The Rolia Forum of

工作学习 / 科技领域杂谈 / Call for jameschen6(梦想农庄-雨水多好). Would you like to discuss HPB since the Topics in "Beatifull Household"?We only have experience to use HPB for pipe bedding, no experience at all on road base.
I think that HPB can not be compacted because sometime when maintenance required for pipe, after excavation, the HPB will flow down. In addition, do you know any project or subdivision use HPB as road base? I remember that you said HPB is good for drainage? If yes, how is the maintenance cost expectation? -maxiaohong(狗拿耗子); 2012-8-10 {396} (#7708520@0)

From my limited knowledges -jameschen6(梦想农庄-雨水多好); 2012-8-10 {1302} (#7709017@0)

Thanks James. HPB is a trade mark of Dufferin aggregates. Their sales happened to be in my office today. Xiao C, could you please provide any information about Canel usage of HPB? -maxiaohong(狗拿耗子); 2012-8-10 {747} (#7709341@0)

Very good. Dufferin Aggregate HPB is 100% passing 9.5 mm and <3% passing 0.075 mmI agree with you except the last point you made. Once you use HPB or 20 mm clear stone (fines have been removed from these two materials). You need to separate the material from normal soil by using geotextile. Otherwise the fine particle will migrate, and result in soil loss and settlement. On the deck or behind retaining wall, people do not want to compact. Use HPB (or 20 mm clear stone) is good, but use it together with geotextile. You can use it to save on the compaction cost. Again use geotextile too. -jameschen6(梦想农庄-雨水多好); 2012-8-10 {511} (#7709396@0)

So your recommendation is using HPB along with Geotextile in all cases, am I right? -maxiaohong(狗拿耗子); 2012-8-10 (#7709407@0)

At all cases where you have it directly on or under the soil type which comprises of fine particles. The geotextile need to be at least 270R -jameschen6(梦想农庄-雨水多好); 2012-8-10 (#7709428@0)

Thank James. I think you are right. Why don't you write something about this opinion and publish it. I do not think that all engineer understands this.We did put lots of HPB underground, and later on with maintenance problems without geotextile. I believe one of the reason is that this is still a relatively new material with both advantage and disadvantage. We still have the design drawing of HBP required in our project today without requirement of geotextile. Hopefully you may add this knowledge of gap to the industry. Just a thought. -maxiaohong(狗拿耗子); 2012-8-10 {391} (#7709454@0)

Xiao C, Would you like to be a part of this discussion. Any information you know about the Canal usage on HPB? -maxiaohong(狗拿耗子); 2012-8-10 (#7709492@0)

I wanted to but I can't. I am not a Civil/Geo guy. My knowledge is super limited. LD is the Civil person and he has done some drainge/underground utilities. Compaction, retaining walls, bedding stones, 57 stones, cement, he knows these stuff. -c_w(cw); 2012-8-10 (#7709505@0)

I saw a lot of existing cases without geotextile. That is not good. I have to leave for a Christian Camp. Talk with you guys on Monday -jameschen6(梦想农庄-雨水多好); 2012-8-10 (#7709756@0)

Entertain and be safe. -c_w(cw); 2012-8-10 (#7709765@0)
Nice talking to you. I would like to discuss in structural usage too if you agree next week. Have a nice weekend and enjoy your off time. -maxiaohong(狗拿耗子); 2012-8-10 (#7709786@0)
Hi James, I found that there is somearea under structure(Not under landscaping paver) where is difficult to compact. I think regular practice is lean mix conc., is HPB acceptable when access is a problem? Do you have any experience for it? -maxiaohong(狗拿耗子); 2012-8-13 (#7715192@0)

""""somearea under structure(Not under landscaping paver) where is difficult to compact."""" ---I do not quite understand what this means. -jameschen6(梦想农庄-雨水多好); 2012-8-14 {675} (#7717353@0)

I work for civil contractor. Our structure is underground and heavy, that is why lean mix is always required under conc. footing or slab.15MPA or sometime 0.4mpa unshrinkable fill are required under base slab. So My question is when there is 2rd level of slab, sometimes, the access is limited, compaction is a problem, in addition, time is a issue when water shows up. So I am thinking of use HPB to fill this void area to ease the construction and speed up the time especially when shrinkable fill required. What do you think if you do not mind? -maxiaohong(狗拿耗子); 2012-8-14 {410} (#7717518@0)

I do not quite understand your situation. Do you mean to use HPB instead of U-fill? I guess you cannot. -jameschen6(梦想农庄-雨水多好); 2012-8-14 (#7717984@0)

Thanks, I discussed with our carpenter today, we may leave the formwork in place while we can do walls beside it. -maxiaohong(狗拿耗子); 2012-8-15 (#7718612@0)

我没有记得见过这个做 ROAD BASE。我见过多的是在 CANAL 的 BANK 上，在 SLOPE 很小，接近路面的地方有这样的。SLOPE 大的地方，用 RIPRAP。好多 LEVEE 上没有 PAVING/CONCRETE，用的是小的 SHELLROCK。-- 不入流的说法。 -c_w(cw); 2012-8-10 (#7709106@0)

晚上我请教一下 LD。我记忆中这种石头好像很沉，而且颗粒和粉末共存似的，这样对 DRAINAGE 是不好的吧？ -c_w(cw); 2012-8-10 (#7709112@0)

Dufferin Aggregate HPB is 100% passing 9.5 mm and <3% passing 0.075 mm -jameschen6(梦想农庄-雨水多好); 2012-8-10 (#7709363@0)

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