Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation
➤ Gửi thông báo lỗi ⚠️ Báo cáo tài liệu vi phạmNội dung chi tiết: Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation
Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation
EFFECTS OF CHLORIDE ION ON MECHANICAL PROPERTIES AND DURABILITY OF SEA SAND CONCRETE CONTAINING SUPPLEMENTARY CEMENTITIOUS MATERIALS UNDER ACCELERATED Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation D CARBONATION(t / y b? y “ I' <ỉ>44256DANG QUOC VIETABSTRACTConcrete, which is a composite material consisting of cement, water, coarse aggregate, and fine aggregate, is the material most used for infrastructure and construction, rhe greater the usage of concrete, the higher is the use of aggregate. Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation The considerable use of aggregate for concrete production has led to shortages of this resource, especially of natural fine aggregate, such as riverEffects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation
sand (RS), rhe mining of RS can. however, lead to significant environmental impacts, including erosion of riverbanks, the shift of river courses, and EFFECTS OF CHLORIDE ION ON MECHANICAL PROPERTIES AND DURABILITY OF SEA SAND CONCRETE CONTAINING SUPPLEMENTARY CEMENTITIOUS MATERIALS UNDER ACCELERATED Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation application as a fine aggregate to replace RS in the construction industry. The use of NSS in concrete manufacture can resolve supply issues in areas where RS has become a scarce resource. The transportation of material will not only be convenient but also take advantage of local material, resultin Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation g in the reduction of construction cost. Replacement of RS by NSS could play a key role 111 reducing the former’s overexploitation. However, the highEffects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation
chloride ion content in NSS can cause a potential risk of coưosion and is the primary reason for its limited use in reinforccd-concrcte manufacture. WEFFECTS OF CHLORIDE ION ON MECHANICAL PROPERTIES AND DURABILITY OF SEA SAND CONCRETE CONTAINING SUPPLEMENTARY CEMENTITIOUS MATERIALS UNDER ACCELERATED Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation a scarce resource, especially coastal areas.Supplementary cementitious materials (SCMs) such as fly ash (FA) and ground granulated blast furnace slag (Bi S). have been widely used in concrete production as a partial replacement of ordinary' Portland cement (OPC). One of the primary’ reasons for the Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation use of SCMs in concrete production is to reduce the environmental impacts by utilizing industrial by-products and reducing cement usage. The additionEffects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation
of SCMs has improved the long-term mechanical properties and durability of concrete under the sealed condition. However, there are limited data concerEFFECTS OF CHLORIDE ION ON MECHANICAL PROPERTIES AND DURABILITY OF SEA SAND CONCRETE CONTAINING SUPPLEMENTARY CEMENTITIOUS MATERIALS UNDER ACCELERATED Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation s extremely sensitive to carbonation. This is a process in which atmospheric carbon dioxide penetrates the cementitious materials and reacts with calcium-bearing phases of concrete and changes the microstructure of concrete. Moreover, carbonation results in the formation of microcracks. As a consequ Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation ence, the carbonation process affects the mechanical properties and durability of concrete. As aforementioned, carbonation causes some disadvantages;Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation
however, most researchers evaluated the feasibility of NSS for concrete production without considering the effects of carbonation. Therefore, to fill EFFECTS OF CHLORIDE ION ON MECHANICAL PROPERTIES AND DURABILITY OF SEA SAND CONCRETE CONTAINING SUPPLEMENTARY CEMENTITIOUS MATERIALS UNDER ACCELERATED Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation ring an accelerated carbonation was investigated in this study. Additionally, the influence of chloride ion on the fresh concrete properties was studied.The study aims to investigate the effect of chloride ion as well as SCMs on the variation of fresh properties of concrete with time. Additionally, Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation the effect of chloride ion and carbonation on the machenical properties and durability of concrete containing SCMs is studied. To fulfill the objectivEffects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation
es of the investigation. NSS and desalted sea sand (DSS) concretes were prepared with a constant water-to-cementitious materials ratio of 0.50. FA andEFFECTS OF CHLORIDE ION ON MECHANICAL PROPERTIES AND DURABILITY OF SEA SAND CONCRETE CONTAINING SUPPLEMENTARY CEMENTITIOUS MATERIALS UNDER ACCELERATED Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation aggregate in this study was exploited from the Karatsu harbor in Saga prefecture. Japan. Meanwhile. DSS was obtained by removing salts from the NSS. The chloride ion content in NSS and DSS was 0.1968% and 0.0054% by mass of dry sand, respectively. Japanese standard specifies that the fine aggregate Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation can be accepted for concrete production when chloride ion content is less than 0.04% by mass of dry sand or less than 0.3 kg hr in the concrete; thereEffects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation
fore, concrete specimens with OPC and DSS were considered as the reference concrete in this study. After mixing, the fresh concrete was divided into tEFFECTS OF CHLORIDE ION ON MECHANICAL PROPERTIES AND DURABILITY OF SEA SAND CONCRETE CONTAINING SUPPLEMENTARY CEMENTITIOUS MATERIALS UNDER ACCELERATED Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation iameter and 200-mm height, in two layers and compacted to reduce air voids. The surfaces of the specimens were smoothed and hermetically scaled with aluminum adhesive tape to prevent excessive waler evaporation and carbonation. Then, all the concrete specimens were placed at 20 + 2 'C for 28 days. A Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation fter hermetically curing for 28 days, the cylindrical specimens were divided into two groups and cured under scaled and carbonation conditions until 1Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation
82 days, rhe scaled specimens were continuously placed at 20 - 2 °C, whereas those under the carbonation condition were completely dcmoldcd and placedEFFECTS OF CHLORIDE ION ON MECHANICAL PROPERTIES AND DURABILITY OF SEA SAND CONCRETE CONTAINING SUPPLEMENTARY CEMENTITIOUS MATERIALS UNDER ACCELERATED Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation ut to determine the compressive strength, and modulus of elasticity of specimens, to evaluate the effects of chloride ion. carbonation on mechanical properties of NSS concrete, hl addition, the permeability, sorptivity. and carbonation depth tests were also conducted to assess the durability perform Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation ance of NSS concrete containing supplementary cementitious materials. The chemical and microstructural tests such as thermogravimetry. scanning electrEffects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation
on microscope, ion chromatography, and mercury' intrusion microscopy (MIP) were also conducted to explain the results effectively. The various resultsEFFECTS OF CHLORIDE ION ON MECHANICAL PROPERTIES AND DURABILITY OF SEA SAND CONCRETE CONTAINING SUPPLEMENTARY CEMENTITIOUS MATERIALS UNDER ACCELERATED Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation air content reduction of concrete for 60 min after mixing. Replacement of OPC by FA and BFS increased the initial slump of fresh concrete, even when NSS was used. Chloride ion in NSS not only accelerated cement hydration but also enhanced po77olanic reactivity of FA and hydraulicily of Bl'S al early Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation ages (i.c., 3 and 7 days), resulting in a significant increase in the compressive strength and clastic modulus of concrete. FA and BI S replacement rEffects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation
educed the early mechanical properties of concrete even in the presence of chloride ion. However, when FA and BFS contained together with the presenceEFFECTS OF CHLORIDE ION ON MECHANICAL PROPERTIES AND DURABILITY OF SEA SAND CONCRETE CONTAINING SUPPLEMENTARY CEMENTITIOUS MATERIALS UNDER ACCELERATED Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation ed condition.Carbonation reduced the modulus of elasticity of FA and BFS concretes due to carbonation shrinkage. The use ofNSS could restrict the reduction of modulus of elasticity of FA and BFS concretes under carbonation condition. The presence of chloride ion could maintain the compressive streng Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation th of FA and BFS concretes under carbonation condition compared with that of the reference concrete at 182 days. The FA and BFS replacements caused anEffects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation
increase in the carbonation coefficient of concrete. However, the presence of chloride ion in NSS could contribute to the improvement of carbonation EFFECTS OF CHLORIDE ION ON MECHANICAL PROPERTIES AND DURABILITY OF SEA SAND CONCRETE CONTAINING SUPPLEMENTARY CEMENTITIOUS MATERIALS UNDER ACCELERATED Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation e pozzolanic reaction of FA and hydraulicity of BFS. Sorptivity reduced more when FA or BFS concretes were produced using NSS. However, the carbonation shrinkage led to a significant increase in sorptivity of FA and BFS concretes in comparison with that of OPC-DSS concrete due to the formation of cr Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation acks. This could facilitate the penetration of water containing some aggressive ions (e.g. sulfate ions) which will affect the durability of FA or BFSEffects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation
concrete than OPC concrete. However, the presence of chloride ion in NSS could restrict the formation ofcracks, resulting in the extensive durabilityEFFECTS OF CHLORIDE ION ON MECHANICAL PROPERTIES AND DURABILITY OF SEA SAND CONCRETE CONTAINING SUPPLEMENTARY CEMENTITIOUS MATERIALS UNDER ACCELERATED Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation carbonation. In conclusion, it should be emphasized that the NSS concretes showed better mechanical properties and durability performance than DSS concretes under both sealed and carbonation conditions regardless of SCMs replacement. The results found in this study contribute to the useful knowledge Effects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation and discussion for verifying the applicability ofNSS for concrete production while considering the effect of carbonation.ACKNOWLEDGEMENTFirst. I woulEffects of chloride ion on mechanical properties and durability of sea sand concrete containing supplementary cementitious materials under accelerated carbonation
d like to express my deepest gratitude to my supervisor. Professor KENJI KAWAI, for his invaluable guidance and encouragement during the entire courseGọi ngay
Chat zalo
Facebook