Temperature Adjustment for Light Weight Deflectometer Application of Evaluating Asphalt Pavement Structural Bearing Capacity

2017 ◽  
Vol 2641 (1) ◽  
pp. 75-82 ◽  
Author(s):  
Chia-Pei Chou ◽  
Yi-Chun Lin ◽  
Ai-Chin Chen
Keyword(s):  
Bearing Capacity ◽  
Asphalt Pavement ◽  
Light Weight ◽  
Light Weight Deflectometer

Construction Quality Control of Unbound Base Course using Light Weight Deflectometer where Reclaimed Asphalt Pavement Aggregate is Used as an Example

2020 ◽  
Vol 2674 (10) ◽  
pp. 989-1002
Author(s):  
Emre Akmaz ◽  
Saad Ullah ◽  
Burak F. Tanyu ◽  
Erol F. Guler
Keyword(s):  
Quality Control ◽  
Asphalt Pavement ◽  
Field Measurements ◽  
Design Criteria ◽  
Reclaimed Asphalt Pavement ◽  
Light Weight ◽  
Reclaimed Asphalt ◽  
Light Weight Deflectometer ◽  
Base Course ◽  
Unbound Aggregate

Reclaimed asphalt pavement (RAP) is already being recycled as a construction and building material. One of the commonly considered applications is to create an unbound aggregate from this material. However, since the particles of RAP have binder coatings, traditional quality control procedures applied during construction such as use of a nuclear density gauge does not provide accurate results. Therefore there is a need to find another method that can be applied during construction to confirm that the placement in the field meets the design criteria. For this reason, in this study, the suitability of using light weight deflectometer (LWD) has been investigated. The presented methodology outlines how to implement the use of LWD to create a target modulus in the laboratory as part of design criteria and compare with the field measurements. In the field, depending on the thickness of the constructed aggregate layer, the LWD measurements may be influenced by more than just the layer of interest. The presented methodology also provides a solution for such multilayer conditions. Although the study primarily focuses on using RAP as the investigated material, the methodology developed in this study can be applied to any type of unbound aggregate as demonstrated in this study.

Study on Static Design Methods of Plain Steel Plate-Light Weight Concrete Hollow Composite Decks

2012 ◽  
Vol 166-169 ◽  
pp. 610-615
Author(s):  
Yong Yang ◽  
Kang An ◽  
Su Sheng Zeng ◽  
Jian Yang Xue
Keyword(s):  
Bearing Capacity ◽  
Calculation Method ◽  
Steel Plate ◽  
Flexural Rigidity ◽  
Design Methods ◽  
Light Weight ◽  
Calculation Methods ◽  
Direction Parallel ◽  
Light Weight Concrete ◽  
Calculation Results

Based on the experiment results of five plain steel plate-light weight concrete hollow deck specimens, the design methods of the composite decks which mainly including the calculation method of the bearing capacity and calculation method of the flexural rigidity were introduced. In the paper, the bearing capacity and flexural rigidity of the composite at two orthogonal directions, which including the direction parallel to the pipes and the direction perpendicular to the pipes, were both introduced. The calculation results of the bearing capacity and middle-span deflection were in good agreement with those of the experimental results, and in the return calculation methods were verified. Therefore, the design methods and calculation methods were useful to the design of this new type composite deck.

Experiment on the Hysteretic Behaviors of Light-Weight Steel Portal Frame with Tapered Members

2011 ◽  
Vol 368-373 ◽  
pp. 206-210
Author(s):  
Qi Cai Li ◽  
Zhen Shan Wang ◽  
Ming Zhou Su ◽  
Xue Chao Shao ◽  
Lin Shen
Keyword(s):  
Energy Consumption ◽  
Bearing Capacity ◽  
Stiffness Degradation ◽  
Seismic Load ◽  
Seismic Action ◽  
Light Weight ◽  
Loading Test ◽  
Skeleton Curve ◽  
Portal Frame ◽  
Tapered Members

In order to study the seismic behavior of steel portal frame structures, Cyclic loading test on a 1:3-scaled model of single-story single-bay steel portal frame with tapered members has been carried out. Based on test results, hysteretic curve, skeleton curve, stiffness degradation and transverse displacement of the structure are obtained. Meanwhile, the seismic performances of the structure are analyzed from aspects of ductility, energy consumption, stiffness degradation, bearing capacity, etc. It is concluded that ductility and energy consumption capacity of this structure are poor; because of its light weight, the structure attracts little seismic load; when portal frame structure designed according to current Chinese design codes suffers from small seismic action, it has enough seismic bearing capacity.

scholarly journals Variação do Módulo de Elasticidade de um solo colapsível de Petrolina-PE com e sem inundação

2018 ◽  
Vol 22 (suppl 1) ◽  
Author(s):  
Jesce John da Silva Borges ◽  
Marta Lúcia Rolim de Almendra Freitas ◽  
Silvio Romero de Melo Ferreira
Keyword(s):  
Light Weight ◽  
Light Weight Deflectometer

RESUMO Solos colapsíveis são solos não saturados que experimentam um rearranjo radical de partículas e grande redução de volume quando inundados, com ou sem aplicação carga adicional. Esses solos apresentam sérios problemas para a Engenharia Geotécnica quando há mudança da umidade, causando deformações adicionais aos solos. A análise do seu comportamento passa a ser uma etapa essencial para o sucesso do projeto de engenharia. Ensaios edométricos simples e duplos, com sucção controlada e a utilização do Expansocolapsômetro têm sido bastante utilizadas para analisar a variação de volume dos solos colapsíveis devido à mudança de umidade, pois permitem avaliar o comportamento dos solos colapsíveis de modo que simulem as condições a que o solo será submetido. O artigo tem por objetivo avaliar o módulo de elasticidade em campo de um solo colapsível de um conjunto Residencial em Petrolina-PE, com e sem a inundação prévia. Foi utilizado em campo o Light Weight Deflectometer - LWD que se trata de um equipamento moderno que aplicação carga dinâmica em uma placa ao solo e permite medir as deflexões e quantifica o módulo de elasticidade. A caracterização física do solo foi realizada em laboratório. O resultado apresentou um solo preponderantemente arenoso, com um módulo de elasticidade que varia de 46,3 a 79,2 MPa e a inundação causa uma redução de 88%. Além disso, verificou-se que o aumento da umidade associada à aplicação da carga dinâmica causa uma redução de sua rigidez, ocorrendo uma diminuição do módulo de elasticidade e, consequentemente, um aumento da deflexão. A partir dos resultados do LWD, estabeleceu-se um critério de identificação de solo colapsível através do coeficiente KLWD, atestando que o solo de Petrolina apresenta suscetibilidade ao colapso: alto para KLWD > 4,2, baixo para KLWD < 2,8 e médio para KLWD entre 2,8 e 4,2.

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