The present paper describes accelerated corrosion test results and the development of a probabilistic model to predict depth variability pitting for pretensioned prestressing wires strands subject corrosion. From tests in chloride-concrete environment mode wire failure is studied, spatial distribution maximum pit along various lengths obtained. analysis shows that pit-depth can be represented by Gumbel extreme value distribution. This extended any length wire, rate time exposure real...

Different types of corrosion may arise in steel reinforcement, such as general corrosion, pitting hydrogen embrittlement, stress cracking and fatigue. However, reinforcement reinforced concrete (RC) structures can be classified into two categories: (uniform) (localised) corrosion. In general, researchers use uniform to study the effect on RC structures. This approach is not accurate for subjected chloride attack, which usually experiences paper describes an accelerated test used obtain...

Abstract Accurate structural behavior interpretation via finite element models is often disrupted by uncertainties, while data-driven approaches can struggle with long datasets, complex fluctuations, and the omission of essential spatio-temporal features. Additionally, these methods are limited their reliance on interpolative predictions. This paper introduces a novel, model-free approach that integrates Moving Principal Component Analysis (MPCA), bidirectional gated recurrent units (biGRU),...

Environmental issues resulted from cement production have become a major concern today. To develop sustainable future it is encouraged to limit the use of this construction material that can affect environment. Cement replacement was proposed partially replace portion in concrete. Geopolymer part inorganic polymer has similar bonding function like It consists alkaline solutions and geological source material. Alkaline liquids used research are 8 M sodium hydroxide (NaOH) solution silicate...

This paper deals with the behavior of a geopolymer concrete beam (GCB) under shear load using high calcium content fly ash (FA). The effect marine environment on strength GCB was considered by curing specimen in sea splashing zone for 28 days. Destructive and non-destructive tests were carried out to determine properties different environments. Geopolymer concretes cured at room temperature showed higher compressive strength, slightly lower porosity, resistivity than that those water. From...

This study is conducted to determine the effect of four variables on compressive strength geopolymer concretes. These are binder/aggregate, Alkalinene/fly ash, superplasticizer (SP) addition and curing system. The important mechanical properties for construction material. Taguchi experimental design method used compile concrete composition achieve maximum strength. Specimens a cylinder with 100 mm diameter 200 height. Compressive test performed at 28 day using SNI 03-6825-2002, Indonesian...

This paper presents a study of the flexural strength geopolymer concrete beam using high calcium content fly ash (FA) in marine environment, without heat curing. Two series specimens were loaded to failure effect chloride environment on beams. Series I subjected sea whereas II kept at room temperature. Tests performed cylinders show that water has no compressive and splitting tensile stress FA based concrete. However, ratio for both was approximately 44%, almost double than normal In...

AbstractAccelerated pitting corrosion tests have been performed to obtain maximum pit- depth data for prestressing 7-wire strands. This is then used develop probabilistic models of and strand strength capacity. The model incorporated in a non-linear Finite Element Analysis study the spatial temporal effects on typical pretensioned prestressed concrete bridge girder. limit states considered are flexural serviceability. time-dependent reliability analysis takes into account uncertainties...

Prestressed concrete structures cannot escape from corrosion problems, especially when they are subjected to very aggressive environment, such as chloride environment. For prestressed structures, of prestressing strands may initiate structural collapse due higher stress levels in the steel. Research on effect has mainly considered have reinforced and full structures. In this study, a framework will be developed predict flexural strength partial The combined with probability analysis take...

Geopolymer concrete is an innovative construction material that has been developed to substitute OPC concrete.Compared concrete, geopolymer better strength and bond performance.As uses waste such as fly ash, it produces less CO2, more environment-friendly than concrete.In order ensure the safety of structure, structural response analysis needed be carried out, flexural performance one important analyses.Previous studies related are mainly performed experimentally, which time-consuming...

Steel bridge girder located in the vicinity of sea cannot escape from corrosion. Over time effect corrosion becomes more significant, especially when there is no interference performed by authority. This study will present reliability analysis steel I designed using SNI T-02-2005 and T-3-2005 subjected to as a results chloride attacks. The model utilized this taken previous research available literature. consider 15m 20m spans close sea, with service life 50 years. To uncertainty all...

This research provided an overview of the potential fly ash based geopolymer paste for application in building construction. Geopolymer with various variations substitution local waste material and high-temperature influence exploited fresh hardened condition. The which utilized this study were sandblasting waste, carbide shell powder, bagasse ash, rice husk bottom ash. findings indicated that fly-based had showed a similar nature OPC binders potentially used civil engineering applications.

This paper deals with the assessment of remaining service life a cooling water intake concrete structure (CWICS) subjected to corrosion due chloride attacks. Field and laboratory tests were performed determine current existing condition structure. Both destructive nondestructive employed obtain parameter needed for assessment. Based on test results, structural analysis was carried out safety factor CWICS determined. From analysis, it found that most elements had greater than unity might...

This study is conducted to determine the effect of five variables on mechanical properties geopolymer binders. These are chloride environment, NaOH molarity, Na 2 SiO 3 /NaOH ratio, fly ash/alkaline activator (FA/AA) ratio and superplasticizer (SP) addition. The considered compressive strength, porosity density. Taguchi experimental design method used compile binder composition achieve maximum strength. Specimens a cylinder with 25 mm diameter 50 height. Compressive strength test performed...

Abstract The utilization of fly ash (FA) into concrete has become a common practice in ready mix production throughout the world, including Indonesia. inclusion this by product material two main advantages: decreasing cost reducing cement content and waste produced from power plant operation. Despite almost decades experience application, low compressive strength containing FA often occurs construction projects This paper describes one case project located East Java. During construction, it...

This research is to find out the contribution of waste energy utilization fly ash and bottom coal as binding agent geopolymer concrete. methodology uses experimental approach in laboratory by making cylinder paste test object with dimension diameter 2.5 cm x height 5 some combination mix time setting (ASTM C 191-04a) compressive strength 39-04a). The concludes that effect on ash-based shows good results strength.

Gedung tinggi di Indonesia khususnya Surabaya sudah dimulai pembangunannya sejak tahun 90an. Namun dikarenakan terjadi krisis moneter pada 1998 membuat beberapa gedung menjadi terbengkalai penyelesaiannya. Salah satunya adalah Apartemen Crystal Garden Jl. Embong Malang yang memiliki 26 lantai. Dan saat ini tersebut akan dimanfaatkan kembali sebagai hunian dan pusat perbelanjaan. Untuk dapat merealisasikan rencana pemanfaatan suatu tinggi, maka diperlukan evaluasi kelayakan terhadap gempa...

Geopolymer concrete is an environmentally friendly concrete. However, the geopolymer binder has a problem with setting time; mainly composition comprises high calcium fly ash. This study utilized bagasse ash to improve time on ash-based binder. The characterization of was carried out by using chemical and phase analysis, while morphology examined scanning electron microscope (SEM). test compressive strength used standard ASTM C 191-04 C39 / C39M respectively. samples determined at 3, 28 56...