MEA dosage reaches a certain threshold, the stress relaxation enhancement brought about by the addition of MEA will no longer be significant; (5) when compared to the experimental data, the established model of early-age constraint stress accurately predicts the tensile constraint stress ...
The model also proves that the affinity hypothesis between linear and nonlinear creep strains (usually taken for granted in the design for stress levels below 70% of concrete strength in compression) is no longer valid when concrete fails under a sustained load, because of the unstable growth of...
(6) A THEORETICAL ANALYSIS OF THE STRESS DISTRIBUTION AROUND DENSE AGGREGATE PARTICLES WITH HIGH MODULUS OF ELASTICITY INDICATES WHY CRACKS ALWAYS DEVELOP IN THE BOND PHASE OF CONCRETE MADE WITH SUCH AGGREGATE MATERIAL. (7) WHEN SPECIMENS ARE SUBMITTED TO SUSTAINED LOADING, THE CRACKS ARE INITIALLY...
aIn this work, cracking of concrete due to steel reinforcement corrosion is experimentally and numerically studied. The tests combined accelerated corrosion—to generate the cracks—with impregnation under vacuum with resin containing fluorescein—to enhance their visibility under ultraviolet light. In ...
The causes of cracking, and the effect of creep in stress relief are explained. Autogenous healing in water-retaining structures is discussed. Seven different types of cracking are explained. Examples are given of where they may occur, and their effects on a structure. Finally, three examples ...
A fracture mechanism for concrete valid under any state of stress and which can be used to predict observed deformational behavior is postulated on the bas... MD Kotsovos,JB Newman - 《Magazine of Concrete Research》 被引量: 28发表: 1981年 Numerical models in fracture mechanics of concrete ...
AN ANALYSIS IS PRESENTED OF THE ORIGIN OF CRACKS IN CONCRETE STRUCTURES. ATTENTION IS DRAWN TO THE FACT THAT CRACKS ARE ORIENTATED IN THE DIRECTION OF THE MAIN TENSILE STRESS AND THAT THEY OCCUR WHEN THESE STRESSES REACH THE TENSILE STRENGTH OF CONCRETE. HOWEVER, THIS TENSILE STRENGTH IS A RAN...
Environmental Stress Cracking In subject area: Engineering Environmental stress cracking is the cracking or crazing of a material in the presence of stress and a chemical environment. From: Medical Device Technologies (Second Edition), 2021 About this pageSet alert Also in subject area: ChemistryDisco...
1) cracking stress 致裂应力 1. The results showed that the concretecracking stressat the early age was associated with the creep and internal and external con-straints directly. 研究表明,早龄期混凝土致裂应力主要与徐变和内外约束有关。
By using the newest temperature-stress testing machine, the cracking resistance of concrete at early ages is studied and the evolution rules of temperature,stress,deformation are achieved.And conclusions are that: Temperature rising due to hydration heat is not directly correlated with cracking,but the...