In order to study the mechanical properties of rubber concrete (RC) with different particle sizes after dry–wet cycles in a sulfate environment, apparent morphology analysis, mass loss relative dynamic elastic modulus compressive strength internal microscopic characteristics and deterioration degree analysis ordinary (NC) were compared analyzed. The results show that increase number cycles, sur...

Abstract Nowadays, the use of waste materials in concrete production is crucial for a clean environment and less cost. This study aimed to enhance some mechanical properties utilizing integral waterproof (IWP) admixture using ceramics as fine aggregate with finer particles improve compressive strength modulus elasticity absorption studied. Studies indicate increase by IWP only also reduction ce...

Abstract This study systematically investigates the hardened properties, durability and void distribution of large-scale 3D printed cement-based materials (3DPC). Experimental results indicate that 3DPC has higher compressive flexural strengths, lower drying shrinkage, better resistance against sulfate attack carbonation than mold-cast materials, but to frost damage chloride ion penetration. Co...

certificateless public key cryptography (cl-pkc) is a useful method in order to solve the problems of traditional public key infrastructure (i. e. large amount of computation, storage and communication cost for managing certificates) and id-based public key cryptography (i. e. key escrow problem), simultaneously. a signcryption scheme is an important primitive in cryptographic protocols which p...

In order to analysis the sulfate diffusion process in polypropylene fiber concrete, influence of introduction on porosity was calculated at first based spatial distribution features which classified into three types, penetration type, half through type and embedded type. On basis Fick’s second law reaction kinetics equation, model ions concrete established. The numerical solution achieved with ...

This study aims to realize the resource regeneration application of copper tailing (as fine aggregates for partial replacement natural aggregates), which avoid environmental pollution due many landfills tailings. The compressive strength and durability (dry shrinkage sulfate attack) tests were carried out evaluate effect tailings on performance mortar. results show that mortar with has higher t...

most of the patients imagine that chest pain is not sign of heart attack. but, may be pain is not sign of heart attack. pain source may be from pulmonary, stomach, intestinal, psychologic or musculoskeletal problems. from these factors, when two or more factors combine to each other, similar signs are happen. all of these factors harden diagnosis of chest pain reason. only with separation of pe...