{"title":"HPC Precast Sewer Pipe","authors":"D. Northwood, K. Cail, K. MacDonald","doi":"10.14359/6097","DOIUrl":"https://doi.org/10.14359/6097","url":null,"abstract":"Recently, a major North American City replaced a large collector sewer which was deteriorated due to corrosion of the reinforcement. This replacement was well in advance of the life cycle estimate of the pipe. The deterioration was caused predominantly by the presence of chloride ion in the soils. As a part of this reconstruction, it was decided to design the concrete to resist the intrusion of chloride ion. Several proprietary admixtures were considered, as well as the use of silica fume, to produce this pipe. The contract was awarded to a conventional dry process pipe plant. Some modification of the mixture proportions was required. An interground silica fume cement was used to reduce the handling difficulties associated with silica fume. A preconstruction trial batch was evaluated for physical properties, including rapid chloride permeability and chloride ion diffusivity. The cost effectiveness of the modified cement and the relatively simple adjustments to the casting process resulted in a very minimal increase in the total construction cost. Design calculations and quality control methods are discussed.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131317892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The Behavior of High Performance Structural Lightweight Concrete at Elevated Temperatures","authors":"M. Gillen","doi":"10.14359/6094","DOIUrl":"https://doi.org/10.14359/6094","url":null,"abstract":"Results from a three year experimental study of the behavior of a high-strength (60 MPa) lightweight aggregate (LWA) concrete at elevated temperatures, including simulated hydrocarbon fire exposure, are described. Mechanical properties as a function of temperature (to 800 C) are also presented, as well as a summary of behavior in fire, and a comparison with normal density high performance and ordinary LWA concretes under similar conditions is made. In addition, a simple and practical method for limiting the propensity of very low permeability, high performance concretes to explosively spall at elevated temperatures is demonstrated. Finally, the first application of this concrete in a major floating oil platform, the quarter-million ton Heidrun TLP, is highlighted. High performance LWA concrete is shown to posses all the best physical, mechanical, and durability characteristics of normal density high performance concretes while still retaining the superior high temperature and fire resistance properties of ordinary lightweight concretes -- an ideal combination of properties for construction of offshore platforms.","PeriodicalId":109987,"journal":{"name":"SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130120195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}