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SP-217: Seventh CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete最新文献

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Self-Compacting Concrete: What Is New? 自密实混凝土:什么是新的?
SP-217: Seventh CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete Pub Date : 2003-09-01 DOI: 10.14359/12902
M. Collepardi
{"title":"Self-Compacting Concrete: What Is New?","authors":"M. Collepardi","doi":"10.14359/12902","DOIUrl":"https://doi.org/10.14359/12902","url":null,"abstract":"This paper summarizes the results on flowing and cohesive superplasticized mixtures studied and placed in the 1970's and 1980's with properties very close to those of Self-Compacting Concretes (SCCs) presently considered the most advanced cementitious material. Case histories concerning the placing of superplasticizers self-leveling concrete without any vibration at all and published in the 19870's are reexamined to compare them with the present SCCs. The paper deals with the ingredients of the mixtures (superplasticizers, cement, fly ash, ground limestone, silica fume, etc.) by examining their specific role in determining the main properties of these concretes, such as fluidity, on the one hand, and resistance to segregation, on the other. Some interesting new materials, such as ground fly ash or powder from recycled aggregates, appear to be very promising for manufacturing SCC in agreement with the requirements needed for sustainable progress.","PeriodicalId":387601,"journal":{"name":"SP-217: Seventh CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127950437","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}
引用次数: 27
Cement Characteristics Affecting the Performance of (3-Naphthalene Sulfonate Superplasticizer 水泥特性对(3-萘磺酸盐高效减水剂性能的影响
SP-217: Seventh CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete Pub Date : 2003-09-01 DOI: 10.14359/12922
Y. Nakajima, T. Goto, K. Yamada
{"title":"Cement Characteristics Affecting the Performance of (3-Naphthalene Sulfonate Superplasticizer","authors":"Y. Nakajima, T. Goto, K. Yamada","doi":"10.14359/12922","DOIUrl":"https://doi.org/10.14359/12922","url":null,"abstract":"One drawback when using poly B-naphthalene sulfonate condensate superplasticizers (PNS) is the difficulty to estimate and control its performance because PNS tends to be affected by slight fluctuations of cement characteristics. In order to prevent these incompatibility phenomena between PNS and cement, establishing a model for estimating the quantitative dispersing ability of PNS is important. A model for predicting PNS performance from several limited parameter based on the fundamental equation of Langmuir type adsorption isotherms is induced. The fluidity model of cement paste containing PNS is show as a conceptualized diagram in Figure 12. The model proposed in this study can explain the well-known effects of alkali sulfate, free lime and calcium sulfate. The optimum content of alkali sulfate for the highest flow can be explained by the concentration change. This model can be applied to various types of cement with diverse characteristics and to predict fluidity change with elapsed time.","PeriodicalId":387601,"journal":{"name":"SP-217: Seventh CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114891757","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}
引用次数: 0
The Molecular Parameters and the Effect of Comb-Type Superplasticizers on Self-Compacting Concrete: A Comparison of Comb-Type Superplasticizer Adsorption onto a Basic Calcium Carbonate 梳状高效减水剂对自密实混凝土的分子参数及影响——梳状高效减水剂在碱式碳酸钙上的吸附比较
SP-217: Seventh CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete Pub Date : 2003-09-01 DOI: 10.14359/12914
C. Comparet, A. Nonat, S. Pourchet, M. Mosquet, P. Maitrasse
{"title":"The Molecular Parameters and the Effect of Comb-Type Superplasticizers on Self-Compacting Concrete: A Comparison of Comb-Type Superplasticizer Adsorption onto a Basic Calcium Carbonate","authors":"C. Comparet, A. Nonat, S. Pourchet, M. Mosquet, P. Maitrasse","doi":"10.14359/12914","DOIUrl":"https://doi.org/10.14359/12914","url":null,"abstract":"","PeriodicalId":387601,"journal":{"name":"SP-217: Seventh CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132691892","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}
引用次数: 2
Improving Concrete Performance with Shrinkage-Reducing Admixtures 用减缩掺合料改善混凝土性能
SP-217: Seventh CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete Pub Date : 2003-09-01 DOI: 10.14359/12904
N. Berke, Li Li, M. Hicks, J. Bae
{"title":"Improving Concrete Performance with Shrinkage-Reducing Admixtures","authors":"N. Berke, Li Li, M. Hicks, J. Bae","doi":"10.14359/12904","DOIUrl":"https://doi.org/10.14359/12904","url":null,"abstract":"Concrete is one of the most durable construction materials. However, cracking adversely affects its durability, appearance, and functionality. A major cause of the cracking is related to shrinkage-induced strains, creating stresses when concrete is restrained. Shrinkage reducing admixtures (SRA's) have been used for several years to reduce drying and autogenous shrinkage. However, their uses in temperature environments were limited due to difficulties in producing good quality air void systems needed for freeaing and thawing resistance. This paper shows that good air void systems and freezing and thawing performance are obtainable with a new formulation of a glycol ether SRA. This formulation is very compatible with polycarboxylate type superplasticizers and calcium nitrite corrosion inhibitor. Furthermore, it is demonstrated that in addition to improving shrinkage and cracking performance, permeability and corrosion performance are improved.","PeriodicalId":387601,"journal":{"name":"SP-217: Seventh CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123904941","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}
引用次数: 30
The Effects of a New High-Range Water-Reducing Agent on the Improvement of Rheological Properties 一种新型高范围减水剂对改善流变性能的影响
SP-217: Seventh CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete Pub Date : 2003-09-01 DOI: 10.14359/12924
T. Sugamata, T. Sugiyama, A. Ohta
{"title":"The Effects of a New High-Range Water-Reducing Agent on the Improvement of Rheological Properties","authors":"T. Sugamata, T. Sugiyama, A. Ohta","doi":"10.14359/12924","DOIUrl":"https://doi.org/10.14359/12924","url":null,"abstract":"This research has developed a new polycarboxylate-based superplasticizer SPN for use in ultra high-strength concretes with water-binder ratios of 20% or less. In this study, concrete containing superplasticizers was investigated in its fresh states. The superplasticizer SPN improves dispersibility as compared with conventional superplasticizerers. Moreover, it reduces both viscosity and the amount of force required to initiate fresh concrete flow from a stationary state. These results indicate that the new superplasticizers will help improve the placeability of ultra high-strength concrete. Regarding SPN leading to a reduction of ion concentration in the liquid phase, an excellent utilization of SPN is suggested.","PeriodicalId":387601,"journal":{"name":"SP-217: Seventh CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129143727","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}
引用次数: 10
Superplasticizer Adsorption on Synthetic Ettringite 高效减水剂在合成钙矾石上的吸附
SP-217: Seventh CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete Pub Date : 2003-09-01 DOI: 10.14359/12920
J. Plank, C. Hirsch
{"title":"Superplasticizer Adsorption on Synthetic Ettringite","authors":"J. Plank, C. Hirsch","doi":"10.14359/12920","DOIUrl":"https://doi.org/10.14359/12920","url":null,"abstract":"Superplasticizers typically work within the first 2 hours of cement hydration. Therefore, early hydration products have to be studied to investigate their mode of action. The experiments in this paper demonstrate that ettringite is a preferred phase for the adsorption of polycondensate or polycarboxylate based superplasticizers, whereas polycondensate amd polycarboxylate practically show no signs of adsorption. For polycarboxylate adsorption, time of addition to ettringite is not important whereas polycondensates adsorb much less when addition is delayed. Adsorption does not seem to occur and therefore cannot explain the different behavior of polycondensates. The presence of superplasticizers during ettringite formation reduces the crystal size of ettringite. The effect is particularly strong for polycondensate superplasticizers. There was no influence on ettringite morphology or quantity formed found.","PeriodicalId":387601,"journal":{"name":"SP-217: Seventh CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123360560","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}
引用次数: 23
Durability of Concrete Made with Different Chemical Admixtures Under Marine Splash Environment 海洋飞溅环境下不同化学外加剂混凝土耐久性研究
SP-217: Seventh CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete Pub Date : 2003-09-01 DOI: 10.14359/12903
T. Mohammed, H. Hamada, T. Yamaji
{"title":"Durability of Concrete Made with Different Chemical Admixtures Under Marine Splash Environment","authors":"T. Mohammed, H. Hamada, T. Yamaji","doi":"10.14359/12903","DOIUrl":"https://doi.org/10.14359/12903","url":null,"abstract":"A detailed investigation on the concrete specimens made with different chemical admixtures was carried out after 10 years of exposure in the marine splash environment. Chemical admixtures include air-entraining admixture (vinsol), water-reducing admixture (lingosulfonate group), various high-range water-reducing and air-entraining admixtures (naphthalene, melamine, polycarboxyl and amino-sulfonate group), and drying shrinkage reducing mixture (glycol ether plus amino alcohol derivatives). The specimens were tested for carbonation depths, chloride ingress, oxygen permeability, electrochemical and physical evaluations of corrosion of steel bars in concrete, porosity and mineralogy of the mortar portion, and SEM (Scanning Electron Microscopy) investigation of steel-concrete interface. Naphthalene group of high-range water-reducing and air-entraining chemical admixture shows relatively better performance with respect to the strength development and chloride ion ingress in concrete. The use of shrinkage reducing admixture shows no harmful effects after 20 years of exposure. The specially adopted method of casting concrete used in this study causes a formation of good steel-concrete interface that prevents the initiation of corrosion even for water soluble chloride concentration around 1.5% of cement mass.","PeriodicalId":387601,"journal":{"name":"SP-217: Seventh CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122055157","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}
引用次数: 2
"Method of Estimating Plastic Viscosity of Cement Paste, Mortar, and Concrete Containing a Chemical Admixture" 《含有化学外加剂的水泥浆、砂浆和混凝土的塑性粘度估算方法》
SP-217: Seventh CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete Pub Date : 2003-09-01 DOI: 10.14359/12912
H. Kikukawa, T. lisaka
{"title":"\"Method of Estimating Plastic Viscosity of Cement Paste, Mortar, and Concrete Containing a Chemical Admixture\"","authors":"H. Kikukawa, T. lisaka","doi":"10.14359/12912","DOIUrl":"https://doi.org/10.14359/12912","url":null,"abstract":"An equation was formulated for estimating the plastic viscosity of cement paste containing an air-entraining admixture, which is a commonly used chemical admixture for concrete. Air entraining admixtures slightly increase the plastic viscosity of near cement paste. The viscosity equation was derived by incorporating this effect, to minimize the difference between the estimation and measurement. The ratio of the plastic viscosity estimated from the proposed viscosity equation to be measured plastic viscosity was found to be approximately 1, the anticipated value. Viscosity equations for mortar and concrete also formulated based on an existing viscosity equation were found to be valid even when the plastic viscosity of the matrix changed.","PeriodicalId":387601,"journal":{"name":"SP-217: Seventh CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126255625","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}
引用次数: 0
Influence of PolyOxyEthylene Di-Phosphonate on the Formation of Ettringite 聚二膦酸氧乙烯对钙矾石形成的影响
SP-217: Seventh CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete Pub Date : 2003-09-01 DOI: 10.14359/12938
A. Guerini, C. Filatre, C. Canevet, M. Mosquet, A. Foissy
{"title":"Influence of PolyOxyEthylene Di-Phosphonate on the Formation of Ettringite","authors":"A. Guerini, C. Filatre, C. Canevet, M. Mosquet, A. Foissy","doi":"10.14359/12938","DOIUrl":"https://doi.org/10.14359/12938","url":null,"abstract":"Concrete technology has evolved considerably lately with the use of New Generation Superplasticizers (NGS). Both laboratory and job site results show some interesting results in combining NGS and Plasticizers. One example is the combination of polycarboxylate derivatives and plasticizers-with set retardation secondary effect-several examples have been reported where these combinations are more efficient for keeping the fluidity levels as a function of time than the NGS alone. Another example of particular interest is the combination of a PoluOxyEthylen DIPhosphonate (POEDP) with a Plasticizer. Some results have shown that the Plasticizer improves somehow the reactivity of the POEDP. Considering that Trisulfoaluminate forms at the early stage of the hydration of cement and that this reaction has a significant influence on the rheological properties of the paste the influence of POEPD and plasticizer combinations on the synthesis of Ettringite was analyzed. Rheological and adsorption measurements have been performed on paste of ettringite produced by mixing calcium hydroxide and aluminum sulphate (1) alone, (ii) in the presence of POEDP, and (iii) in the presence of POEDP and Gluconate.","PeriodicalId":387601,"journal":{"name":"SP-217: Seventh CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126048793","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}
引用次数: 1
"Effects of Superplasticizers, Powder Fineness, and Solution Electrolyte Content on the Rheology of Model Paste Systems" 高效减水剂、粉末细度和溶液电解质含量对模型浆料体系流变性的影响
SP-217: Seventh CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete Pub Date : 2003-09-01 DOI: 10.14359/12934
D. Swift, P. Banfill
{"title":"\"Effects of Superplasticizers, Powder Fineness, and Solution Electrolyte Content on the Rheology of Model Paste Systems\"","authors":"D. Swift, P. Banfill","doi":"10.14359/12934","DOIUrl":"https://doi.org/10.14359/12934","url":null,"abstract":"Model hydraulically inactive powders have been used to investigate the effect of polycarboxylate and lignosulfonate superplasticizers. A new rotational rheometer, avoiding the risks of sample separation, slippage and uncertain shear history, was used. Magnesium oxide can be used to model the rheology of cement pastes but an appropriate solution electrolyte composition must be used. Ground granulated blast furnace slag can be used but results are sensitive to glass content and particle fineness. The effects of admixture chemistry can be studied using model paste systems.","PeriodicalId":387601,"journal":{"name":"SP-217: Seventh CANMET/ACI International Conference on Superplasticizers and Other Chemical Admixtures in Concrete","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124928579","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}
引用次数: 5
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