Effects of internal alkali activation on chemical and mechanical properties of fly ash cement systems
➤ Gửi thông báo lỗi ⚠️ Báo cáo tài liệu vi phạmNội dung chi tiết: Effects of internal alkali activation on chemical and mechanical properties of fly ash cement systems
Effects of internal alkali activation on chemical and mechanical properties of fly ash cement systems
Hiroshima UniversityDOCTOR OF ENGINEERINGBUI PHUONG TRINHEffects of Internal Alkali Activation onChemical and Mechanical Properties ofFly Ash Cement S Effects of internal alkali activation on chemical and mechanical properties of fly ash cement systems Systems• -ử/ >42248ABSTRACTFly ash concrete has been used widely in the construction because of taking the advantages of the unproved durability, effective cost, and environmental protection. However, low-calcium fly ash concrete has the lower strength than the cement concrete due to slow pozzolanic Effects of internal alkali activation on chemical and mechanical properties of fly ash cement systems reaction of fly ash. This results in its limitation for the production of high strength concrete. Ill the recent years, several studies have suggesteEffects of internal alkali activation on chemical and mechanical properties of fly ash cement systems
d alkali activations to accelerate the pozzolanic reaction of fly ash panicles. One of alkali activations is performed by mixing one or some types of Hiroshima UniversityDOCTOR OF ENGINEERINGBUI PHUONG TRINHEffects of Internal Alkali Activation onChemical and Mechanical Properties ofFly Ash Cement S Effects of internal alkali activation on chemical and mechanical properties of fly ash cement systems l temperature Ú1 alkali activation needs to be considered as the more practical method. Tn addition to the alkali activation, internal curing has been investigated for improving the properties of high strength concrete with a low water to binder ratio. Nevertheless, rhe previous snidies of internal Effects of internal alkali activation on chemical and mechanical properties of fly ash cement systems curing have discussed only the effects of internal water supplied from internal curing agents (such as prc-weltcd lightweight aggregate, super absorbeEffects of internal alkali activation on chemical and mechanical properties of fly ash cement systems
nt polymers, porous ceramic waste aggregate (PCWA), and so on) on some properties of concrete. The internal acceleration for pozzolanic reaction by usHiroshima UniversityDOCTOR OF ENGINEERINGBUI PHUONG TRINHEffects of Internal Alkali Activation onChemical and Mechanical Properties ofFly Ash Cement S Effects of internal alkali activation on chemical and mechanical properties of fly ash cement systems s to investigate an internal alkali activation (ĨAA) on the fly ash cement systems cured at normal temperature so that the fly ash concrete using PCWA imbibing alkali solution could get the maximized strength and enhanced durability.To achieve the above-mentioned purpose, this thesis is organized as Effects of internal alkali activation on chemical and mechanical properties of fly ash cement systems follow:Chapter 1 describes the background, aims, and methodology of this study.Chapter 2 provides a brief literature review about the effects of flyEffects of internal alkali activation on chemical and mechanical properties of fly ash cement systems
ash, the mechanisms and effects of internal curing, and the alkali activation on the chemical reaction and the longterm mechanical properties of the fHiroshima UniversityDOCTOR OF ENGINEERINGBUI PHUONG TRINHEffects of Internal Alkali Activation onChemical and Mechanical Properties ofFly Ash Cement S Effects of internal alkali activation on chemical and mechanical properties of fly ash cement systems mixing and casting progress, the curing condition for the fly ash cement system. The experiments of fundamental models were performed to study the effects of LAA on the chemical and mechanical properties of the fly ash cement systems. They were (1) an original model through an installed syringe. (2 Effects of internal alkali activation on chemical and mechanical properties of fly ash cement systems ) a model of internal activation by using PCWA. In addition, the effects of IAA on the mechanical properties of fly ash concrete using PCWA prepared iEffects of internal alkali activation on chemical and mechanical properties of fly ash cement systems
n saturated-surface dry condition after the immersion in alkali solution for 7 days were investigated. Three types of ĨAA used in this study were (1) Hiroshima UniversityDOCTOR OF ENGINEERINGBUI PHUONG TRINHEffects of Internal Alkali Activation onChemical and Mechanical Properties ofFly Ash Cement S Effects of internal alkali activation on chemical and mechanical properties of fly ash cement systems 1AA, the effects of starting time of TA A on the pozzolanic reaction of fly ash cement systems were also studied. Cement systems with 0%, 20% and 10 mass% of fly ash replaccmculr alios were used. while the concrete using PCWA by 0°o and 40 vol.% of coarse aggregatereplacement ratios were used in thi Effects of internal alkali activation on chemical and mechanical properties of fly ash cement systems s study. Tn order to evaluate the effects of TA A. the measurements of Ca(Oll)2 (CH) content and porosity, the calculation of CH consumption by the poEffects of internal alkali activation on chemical and mechanical properties of fly ash cement systems
zzolanic reaction, and test of the compressive strength of concrete were carried out by thermal gravimetric analysis, mercury intrusion porosimctiy, aHiroshima UniversityDOCTOR OF ENGINEERINGBUI PHUONG TRINHEffects of Internal Alkali Activation onChemical and Mechanical Properties ofFly Ash Cement S Effects of internal alkali activation on chemical and mechanical properties of fly ash cement systems starting time of TAA on the chemical reaction of the fly ash cement systems by examining the CH content and consumption of CH. The experiments demonstrates that ĨAA nor only decreased the CH content bur also increased rhe CH consumption by rhe pozzolanic reaction in the cement paste with 40% replac Effects of internal alkali activation on chemical and mechanical properties of fly ash cement systems ement of fly ash (FA 10). Moreover, an injection of saturated Ca(Oll)j solution reduced the CH content and increased the consumption of CH in FA40 morEffects of internal alkali activation on chemical and mechanical properties of fly ash cement systems
e than that of water or NaOH solution Tn addition to the effects of types of IAA. It can be found that 1AA 3 months after castingiiincreased the consuHiroshima UniversityDOCTOR OF ENGINEERINGBUI PHUONG TRINHEffects of Internal Alkali Activation onChemical and Mechanical Properties ofFly Ash Cement S Effects of internal alkali activation on chemical and mechanical properties of fly ash cement systems and promoting the cement hydration of the fly asli cement systems. This was also confirmed by SEM examination.Chapter 5discusses the effects of 1AA OU the mechanical properties of the fly ash cement systems by measuring the porosity and hardness, and testing the compressive strength of the fl) ash c Effects of internal alkali activation on chemical and mechanical properties of fly ash cement systems oncrete. It shows that 1AA decreased the total pore volume ill FA-10. Furthermore, pore size distribution was alerted by IAA, with the decrease in theEffects of internal alkali activation on chemical and mechanical properties of fly ash cement systems
volume ratio of 20-330 mil pores to the total pore and the increase in that of 3-20 nm pores in FA40. It indicates that IAA was effective in acceleraHiroshima UniversityDOCTOR OF ENGINEERINGBUI PHUONG TRINHEffects of Internal Alkali Activation onChemical and Mechanical Properties ofFly Ash Cement S Effects of internal alkali activation on chemical and mechanical properties of fly ash cement systems increase in (hat of 3-20 rim pores, it can be said that the 1AA 3 months after casting was more effective in accelerating rhe pozzolanic reaction of the fly ash cement paste at rhe age of 12 months than that 1 month after casting. The experiment by using the model of internal activation with PCWA i Effects of internal alkali activation on chemical and mechanical properties of fly ash cement systems ndicates that 1AA also improved the microstructure of mtcriacial transition zone (TTZ) and bulk paste in the fly ash cement systems ar rhe age of 6 moEffects of internal alkali activation on chemical and mechanical properties of fly ash cement systems
nths. Tn addition, the effects of 1AA by using PCVVA on the mechanical properties of the fly ash concrete can be briefly concluded that although the sHiroshima UniversityDOCTOR OF ENGINEERINGBUI PHUONG TRINHEffects of Internal Alkali Activation onChemical and Mechanical Properties ofFly Ash Cement S Effects of internal alkali activation on chemical and mechanical properties of fly ash cement systems s those without PCWA, the macropore volume (pores ranging 0.05 50 |im) was reduced in the presence of ĨAA ar the ages of 28, 182, and 364 days. Moreover, pore size distribution was altered by IAA, with the decrease in the volume ratio of 20-330 inn pores to the total pore and the increase HI that of Effects of internal alkali activation on chemical and mechanical properties of fly ash cement systems 3-20 11111 pores. Briefly, the pozzolanic reaction of rhe fly ash cement systems was accelerated by IAA, with the decrease in the volume ratio of 20-Effects of internal alkali activation on chemical and mechanical properties of fly ash cement systems
330 11111 pores to the total pore, the increase 111 the volumeiiiratio of 3-20 mil pores, and the improved ITZ microstructure although the enhanced coHiroshima UniversityDOCTOR OF ENGINEERINGBUI PHUONG TRINHEffects of Internal Alkali Activation onChemical and Mechanical Properties ofFly Ash Cement S Effects of internal alkali activation on chemical and mechanical properties of fly ash cement systems n of the fly ash cement system, hl addition, the differences in the stalling lime of 1AA mechanism affecting the microstructure development ill FA-10 and the differences of each type of IAA in the activation mechanism of the fly ash particles are also described.Chapter 7states the conclusions of thi Effects of internal alkali activation on chemical and mechanical properties of fly ash cement systems s study. Recommendations for future work are also provided.ivCONTENTSABSTRACTCONTENTSLIS I OF FIGI RESLIST OF TABLESACKNOW LEDGEMEM sCHAPTER 1: INTRODEffects of internal alkali activation on chemical and mechanical properties of fly ash cement systems
UCTIONI. I GENERAL1.2IN 1ERNAL ALKALI ACTIVATION (1AA) ON 1 LY ASH CEMENT SYS 1 EMS1.3ATMS OF THE RESEARCHHiroshima UniversityDOCTOR OF ENGINEERINGBUI PHUONG TRINHEffects of Internal Alkali Activation onChemical and Mechanical Properties ofFly Ash Cement SHiroshima UniversityDOCTOR OF ENGINEERINGBUI PHUONG TRINHEffects of Internal Alkali Activation onChemical and Mechanical Properties ofFly Ash Cement SGọi ngay
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