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Study on Ji’an Area Ready-mixed Concrete Rebound Strength Curve

Author: LiJiuMing
Tutor: GuiGuoQing；HuangSuPing
School: Nanchang University
Course: Structural Engineering
Keywords: Ready-mixed concrete Rebound Method The average relative error The relative standard deviation Correction factor
CLC: TU528
Type: Master's thesis
Year: 2011
Downloads: 12
Quote: 0
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Abstract


The promotion and application of ready-mix concrete is a brand-new green businesses and systems engineering, the rebound method field strength detection of concrete structures is the most widely used method of nondestructive testing technology. In this paper, the Ji'an region ready-mixed concrete to establish the rebound strength curve, different materials, construction and molding process differences factors rebound strong measurement accuracy, taking the test piece strength and the strength of structural differences to take core test fixes and engineering validation. Draw the following conclusions: (1) comparative analysis of mixing of the concrete block rebound measured intensity data regression and error, there are large differences that mixed regression curve composed of different materials and molding process concrete strength precision, proposed the establishment of the region strength curve, as the goal should be the minimum relative error and consider pebbles, gravel, pumping, non pumping different to improve rebound curves measured strong accuracy measures. (2) consider the pebbles, gravel, pumping and non-pumping different comparative analysis of the the test block rebound measured data classification and regression error: pebbles of the regional non-pumping and pebbles pumping concrete test block test regression curve relative error is consistent with countries rebound method for testing concrete compressive strength technical regulations (JGJ / T 23-2001) (hereinafter referred to as the \strength of concrete test block test regression curve presumption of national unity curve relative error is quite different, the regression curve of the test block test measuring strength accuracy is significantly better than the \(3) consider the strength and the strength of structural differences of the test piece, the test block test to establish the rebound strength curve coring verification and correction conclusions: 1) State Statutes the unified curve measured strong, respectively, using the modified coefficient values ??of 1.034 and 1.065, applied to the region C20-C40 pumping concrete rebound measuring strength concrete and C20-C40 pebble pebble non-pumping. 2) amended the region gravel pumping concrete strength curve (f = 0.05371 × R1.8682 × 10-0.03980d) applicable to the region C20-C60 gravel pumping concrete rebound measured; gravel pump send concrete amendments apply to the region C20-C60 gravel pumping concrete rebound measuring strength strength curve (, = 030588 × R141204 × 10-003163d). The results of this research can be used as an important basis of the development of Jiangxi Province (Gian) of ready-mixed concrete strength curve and a unified national strength curve.

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