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Research on Early Prediction and Evaluation Methods of Quality of Concrete

Author: YuLiangLiang
Tutor: YangYingZi
School: Harbin Institute of Technology
Course: Structural Engineering
Keywords: Water-cement ratio Microwave maintenance Early prediction Concrete quality Ultrasonic velocity
CLC: TU528.0
Type: Master's thesis
Year: 2007
Downloads: 165
Quote: 2
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Abstract


Concrete casting molding after a short period of time, especially in a few hours you can give some evaluation of their quality , for the latter performance ( strength ) to give scientific prediction , has been a much-anticipated something concrete workers . For example, the water-cement ratio and concrete compressive strength of concrete quality control of the most important indicators , it is possible to predict at the earliest possible time and post- cement ratio of concrete strength , the timely detection of problems and respond quickly , this is the durability of concrete projects and the improvement of modern concrete construction technology has a very important significance. This study consists of three parts: the microwave method to determine the water-cement ratio of fresh concrete ; obtained using microwave accelerated curing compressive strength of concrete at early to predict the compressive strength of concrete standard curing late ; utilize concrete ultrasonic velocity versus time regular monitoring of the process of setting and hardening of concrete early , and then in the early evaluation of the quality of concrete . Fresh concrete and mortar in the evaporation of water under microwave irradiation process is divided into three stages , slow evaporation - rapid evaporation of escape - the quality tends to a constant . A large number of experiments show that high-temperature heating by microwaves can be within 10min more accurate determination of the water-cement ratio of fresh concrete , concrete and pulp screen measured by microwave heating of water-cement ratio was higher precision . P20 (45) spaced 160min P20 (40) spaced 160min, was identified as the best microwave curing system to predict late strength of concrete , rapid curing method using microwave 6h measured compressive strength of the concrete can be predicted standard curing concrete 7d, 28d compressive strength values. Develop a prediction formula , the predicted error range ± 9% , respectively , and within ± 13% . Ultrasonic velocity values ??with fresh concrete setting and hardening process of changing, the initial rapid growth of the ultrasonic velocity , 7h velocity values ??after growth has stabilized . By monitoring the on-site concrete ultrasonic velocity - time curves obtained in the laboratory and then compare the design of concrete standard velocity - time curve , we can make on-site quality evaluation of fresh concrete .

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CLC: > Industrial Technology > Building Science > Building Materials > Non-metallic materials > Concrete and concrete products > General issues
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