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背景资料
某施工单位承包浇筑跨海大桥大型混凝土承台施工。该承台的平面尺寸为10m×10m，承台顶标高为+3.5m，底标高为一0.5m，6根直径2.0m的钢管桩伸人承台混凝土2m，桩芯混凝土已浇筑完成。工程所处海域属规则半日潮，周期为12小时25分钟。施工时高潮位+2.5m，低潮位一1.5m，现要求用非水密模板趁低潮浇筑承台混凝土，封底混凝土厚1.0m。施工中采用有效生产能力为80m3/h的混凝土拌和船供应混凝土，混凝土分灰、振捣等操作时间为0.5h。
问题
1.港口与航道工程混凝土趁低潮位浇筑应具备什么条件？
2.事先要安排怎样的试验项目，获取满足趁低潮位浇筑所需的一项必要的指标数据（计算中取该指标为1.5h）。
3.何时开始浇筑混凝土最为有利？
4.假定潮水为均匀升降，通过计算，判断趁低潮位施工是否可行。
Harry, the managing director of Gilt Ltd, has been approached by Itt plc in respect of its making a takeover bid for Gilt Ltd. Itt plc has given Harry what is described as a facility fee of ￡50,000 for ensuring that the takeover is successful.
At the next board meeting Harry convinces the other directors that the take-over bid is in the long-term interest of Gilt Ltd, but they are concerned that the holders of the majority of the issued share capital will not approve of the takeover.
In order to ensure the success of the takeover, the directors of Gilt Ltd agree that they should allot suffi cient new shares to Itt plc to ensure that a new majority of members will support the takeover.
After the allocation of the shares to Itt plc a general meeting is called to consider the takeover and it is approved, with Itt plc voting in favour.
May, a substantial shareholder in Gilt Ltd has subsequently found out about the actions of Itt plc, Harry and the other directors.
Required:
Advise May as to the legality of the share allotment and as to what action can be taken against Harry.
Chi, Di and Fi formed an ordinary partnership to run an art gallery. Each of them paid ￡100,000 into the business. As Fi had no prospect of raising any more money it was agreed between them that her maximum liability for any partnership debts would be fi xed at her original contribution of ￡100,000. The partnership agreement specifi cally restricted the scope of the partnership business to the sale of ‘paintings, sculptures and other works of art.’ In January 2010 Chi took ￡10,000 from the partnership’s bank drawn on its overdraft facility. She had told the bank that the money was to fi nance a short-term partnership debt but in fact she used the money to pay for a holiday. In February Di entered into a ￡25,000 contract on behalf of the partnership to buy some books, which she hoped to sell in the gallery.
Required:
Advise Chi, Di and Fi as to their various rights and liabilities in relation to the operation of the business under partnership law.
背景资料
某港口工程预制沉箱混凝土设计要求的混凝土立方体抗压强度标准值为45MPa，经计算和试配优化，确定混凝土的配合比为1：1.15：2.68，混凝土的水胶比为0.40，高效减水剂的掺量为水泥重的0.7%0，AE引气剂的掺量为水泥重的0.08%，混凝土的含气量为4.0%。
问题
1.按规范规定，混凝土的施工配制强度应取多少？这时混凝土的施工强度≥设计要求的立方体抗压强度标准值的保证率为多少？
2.该混凝土的砂率为多少？（砂的相对密度为2.62，碎石的相对密度为2.65）
3.计算每立方米混凝土的各种材料用量。
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