当前位置:考试网  > 试卷库  > 建筑工程  > 建造师  > 二级建造师  >  某城市主干路道路工程地质条件良好,地下水埋深在12m以下。施工道路部分通过农田,部分位于现况路上。为保证路基稳定,必须置换腐殖土,刨除旧路,采用塑性指数10~18的素土填筑。碾压密实。设计的路面底基层、基层结构是:12%石灰土基底层30cm,石灰粉煤灰砂砾基层40cm.无机结合料稳定材料不允许现场拌合。 问题: 控制石灰粉煤灰砂砾基层施工质量的要点有哪些?
试题预览

某城市主干路道路工程地质条件良好,地下水埋深在12m以下。施工道路部分通过农田,部分位于现况路上。为保证路基稳定,必须置换腐殖土,刨除旧路,采用塑性指数10~18的素土填筑。碾压密实。设计的路面底基层、基层结构是:12%石灰土基底层30cm,石灰粉煤灰砂砾基层40cm.无机结合料稳定材料不允许现场拌合。

问题:

控制石灰粉煤灰砂砾基层施工质量的要点有哪些?

更新时间:2024-06-25 03:18:29
收藏
纠错
正确答案:

(1)石灰粉煤灰砂砾基层是该路的承重层。根据背景条件,该路的石灰粉煤灰砂砾基层所处的工程条件较理想,重点在该基层自身质量控制。要使材料强度达标,即主干路R7为0.8~1.1MPa.首先一个要点应注意基层原材料,应采用符合质量要求的石灰、粉煤灰、砂砾。

(2)应注意配合比。必须掌握该材料中的石灰、粉煤灰含量及混合料的最佳含水量和最大干密度等质量要素及相互间的关系。

(3)城市道路中的无机结合料稳定材料必须工厂化集中拌合。为保证质量,应注意使用不同原材料均需分开堆放、防雨,严格控制含水量、运输及混合料堆放时间要求。

(4)注意摊铺碾压环节。摊铺时掌握摊铺杜铺系数,碾压时掌握最佳含水量(±1%~±2%)和机型配套、碾压工艺等。

(5)注意养生期控制要求。

(6)注意质量控制全过程的质量检验报告,不要缺项。

答案解析:

暂无解析

你可能感兴趣的试题

关于风管系统安装要点的说法中,正确的有()。

安装胀锚地脚螺栓的基础混凝土强度不得小于()MPa,基础混凝土或钢筋混凝土有裂缝的部位不得使用胀锚地脚螺栓。

下列关于防腐蚀衬里施工技术说法错误的是()。

因企业分立而新设立的建筑业企业,其资质等级应按( )。

下列参数属于风机性能参数的是()。

热门试题 更多>
Felicity Lawrence Thursday December 28, 2006 The Guardian 1. Consumers are to be presented with two rival new year advertising campaigns as the Food Standards Agency goes public in its battle with the industry over the labelling of unhealthy foods. 2. The Guardian has learned that the FSA will launch a series of 10-second television adverts in January telling shoppers how to follow a red, amber and green traffic light labelling system on the front of food packs, which is designed to tackle Britain’s obesity epidemic. 3. The campaign is a direct response to a concerted attempt by leading food manufacturers and retailers, including Kellogg’s and Tesco, to derail the system. The industry fears that traffic lights would demonise entire categories of foods and could seriously damage the market for those that are fatty, salty or high in sugar. 4. The UK market for breakfast cereals is worth £1.27bn a year and the manufacturers fear it will be severely dented if red light labels are put on packaging drawing attention to the fact that the majority are high in salt and/or sugar. 5. The industry is planning a major marketing campaign for a competing labelling system which avoids colour-coding in favour of information about the percentage of "guideline daily amounts" (GDAs) of fat, salt and sugar contained in their products. 6. The battle for the nation’s diet comes as new rules on television advertising come into force in January which will bar adverts for unhealthy foods from commercial breaks during programmes aimed at children. Sources at the TV regulators are braced for a legal challenge from the industry and have described the lobbying efforts to block any new ad ban or colour-coded labelling as "the most ferocious we’ve ever experienced". 7. Ofcom’s chief executive, Ed Richards, said: "We are prepared to face up to any legal action from the industry, but we very much hope it will not be necessary." The FSA said it was expecting an onslaught from the industry in January. Senior FSA officials said the manufacturers’ efforts to undermine its proposals on labelling could threaten the agency’s credibility. 8. Terrence Collis, FSA director of communications, dismissed claims that the proposals were not based on science. "We have some of the most respected scientists in Europe, both within the FSA and in our independent advisory committees. It is unjustified and nonsensical to attack the FSA’s scientific reputation and to try to undermine its credibility." 9. The FSA is understood to have briefed its ad agency, United, before Christmas, and will aim to air ads that are "non-confrontational, humorous and factual" as a counterweight to industry’s efforts about the same time. The agency, however, will have a tiny fraction of the budget available to the industry. 10. Gavin Neath, chairman of Unilever UK and president of the Food and Drink Federation, has said that the industry has made enormous progress but could not accept red "stop" signs on its food. 11. Alastair Sykes, chief executive of Nestlé UK, said that under the FSA proposals all his company’s confectionery and most of its cereals would score a red. "Are we saying people shouldn’t eat confectionery? We’re driven by consumers and what they want, and much of what we do has been to make our products healthier," he said. 12. Chris Wermann, director of communications at Kellogg’s, said: "In principle we could never accept traffic light labelling." 13. The rival labelling scheme introduced by Kellogg’s, Danone, Unilever, Nestlé, Kraft and Tesco and now favoured by 21 manufacturers, uses an industry-devised system based on identifying GDAs of key nutrients. Tesco says it has tested both traffic lights and GDA labels in its stores and that the latter increased sales of healthier foods. 14. But the FSA said it could not live with this GDA system alone because it was "not scientific" or easy for shoppers to understand at a glance. Questions 1-6 Answer the questions below using NO MORE THAN THREE WORDS from the passage for each answer. 1. When will instructions be given on reading the color-coded labels? 2. Where can customers find the red light labels? 3. What problem is the FSA trying to handle with the labeling system? 4. Which product sells well but may not be healthy? 5. What information, according to the manufacturers, can be labeled on products? 6. What can not be advertised during children’s programmes? Questions 7-13 Use the information in the text to match the people (listed A-E) with the opinions (listed 7-13) below. Write the appropriate letter (A-E) for questions 1-7. NB You may use any letter more than once. A Ed Richard B Terrence Collis C Gavin Neath D Alastair Sykes E Chris Wermann 7. Generally we will not agree to use the red light labels. 8. It is unreasonable to doubt if FSA is trustworthy. 9. We are trying to meet our consumers’ needs. 10. The food industry has been improving greatly. 11. The color-coded labeling system is scientific. 12. Our products will be labeled unhealthy by the FSA. 13. We are ready to confront the manufacturers.
试题分类: 阅读
How shops can exploit people's herd mentality to increase sales 1.A TRIP to the supermarket may not seem like an exercise in psychological warfare—but it is.Shopkeepers know that filling a store with the aroma of freshly baked bread makes people feel hungry and persuades them to buy more food than they had intended.Stocking the most expensive products at eye level makes them sell faster than cheaper but less visible competitors.Now researchers are investigating how “swarm intelligence” (that is,how ants,bees or any social animal,including humans,behave in a crowd) can be used to influence what people buy. 2.At a recent conference on the simulation of adaptive behaviour in Rome,Zeeshan-ul-hassan Usmani,a computer scientist from the Florida Institute of Technology,described a new way to increase impulse buying using this phenomenon.Supermarkets already encourage shoppers to buy things they did not realise they wanted: for instance,by placing everyday items such as milk and eggs at the back of the store,forcing shoppers to walk past other tempting goods to reach them.Mr Usmani and Ronaldo Menezes,also of the Florida Institute of Technology,set out to enhance this tendency to buy more by playing on the herd instinct.The idea is that,if a certain product is seen to be popular,shoppers are likely to choose it too.The challenge is to keep customers informed about what others are buying. 3.Enter smart-cart technology.In Mr Usmani's supermarket every product has a radio frequency identification tag,a sort of barcode that uses radio waves to transmit information,and every trolley has a scanner that reads this information and relays it to a central computer.As a customer walks past a shelf of goods,a screen on the shelf tells him how many people currently in the shop have chosen that particular product.If the number is high,he is more likely to select it too. 4.Mr Usmani's “swarm-moves” model appeals to supermarkets because it increases sales without the need to give people discounts.And it gives shoppers the satisfaction of knowing that they bought the “right” product—that is,the one everyone else bought.The model has not yet been tested widely in the real world,mainly because radio frequency identification technology is new and has only been installed experimentally in some supermarkets.But Mr Usmani says that both Wal-Mart in America and Tesco in Britain are interested in his work,and testing will get under way in the spring. 5.Another recent study on the power of social influence indicates that sales could,indeed,be boosted in this way.Matthew Salganik of Columbia University in New York and his colleagues have described creating an artificial music market in which some 14,000 people downloaded previously unknown songs.The researchers found that when people could see the songs ranked by how many times they had been downloaded,they followed the crowd.When the songs were not ordered by rank,but the number of times they had been downloaded was displayed,the effect of social influence was still there but was less pronounced.People thus follow the herd when it is easy for them to do so. 6.In Japan a chain of convenience shops called RanKing RanQueen has been ordering its products according to sales data from department stores and research companies.The shops sell only the most popular items in each product category,and the rankings are updated weekly.Icosystem,a company in Cambridge,Massachusetts,also aims to exploit knowledge of social networking to improve sales. 7.And the psychology that works in physical stores is just as potent on the internet.Online retailers such as Amazon are adept at telling shoppers which products are popular with like-minded consumers.Even in the privacy of your home,you can still be part of the swarm. Questions 1-6 Complete the sentences below with words taken from the reading passage.Use NO MORE THAN THREE WORDS for each answer. 1.Shopowners realize that the smell of _______________ can increase sales of food products. 2.In shops,products shelved at a more visible level sell better even if they are more _______________. 3.According to Mr.Usmani,with the use of “swarm intelligence” phenomenon,a new method can be applied to encourage _______________. 4.On the way to everyday items at the back of the store,shoppers might be tempted to buy _______________. 5.If the number of buyers shown on the _______________ is high,other customers tend to follow them. 6.Using the “swarm-moves” model,shopowners do not have to give customers _______________ to increase sales.
试题分类: 阅读
试题分类: 计算机二级