【摘要】：隨著中國綜合國力的不斷攀升,在現(xiàn)代化進程中不可避免的產(chǎn)生大量建筑垃圾。再生骨料混凝土(Recycled Aggregate Concrete)簡稱再生混凝土(Recycled Concrete),是一種將建筑垃圾變廢為寶的技術(shù),發(fā)展再生混凝土技術(shù)能有效解決發(fā)展與環(huán)保之間的矛盾,具有良好的環(huán)保效益、社會效益、經(jīng)濟效益�；馂�(zāi)是發(fā)生頻率最高、對公眾安全和社會發(fā)展最具威脅的主要災(zāi)害之一,在高溫條件對混凝土結(jié)構(gòu)的變形性能、應(yīng)力分布和承載力有很大影響。因此,對多軸受壓應(yīng)力狀態(tài)下高溫后再生混凝土的受力性能,本文開展了以下研究:(1)對三種取代率(0%、50%、100%)的再生混凝土試塊,經(jīng)高溫處理(200℃、400℃)后,進行了雙軸受壓試驗研究,得出了不同應(yīng)力比條件下的雙軸壓強度、變形規(guī)律以及應(yīng)力—應(yīng)變曲線的變化規(guī)律,建立相應(yīng)的破壞準則,并考慮不同溫度、不同取代率對上述性能的影響規(guī)律。研究表明:高溫后雙軸壓強度和峰值應(yīng)變較常溫下單軸壓強度和峰值應(yīng)變有一定提高,同一取代率條件下,隨著溫度的提高,雙軸壓強度降低,峰值應(yīng)變增大;同一溫度條件下,隨著取代率的提高,雙軸壓強度降低,峰值應(yīng)變增大。(2)對三種取代率(0%、50%、100%)的再生混凝土試塊,經(jīng)高溫處理(200℃、400℃)后,進行了真三軸受壓試驗研究,得出了不同應(yīng)力比條件下的三軸壓強度、變形規(guī)律以及應(yīng)力—應(yīng)變曲線的變化規(guī)律,建立相應(yīng)的破壞準則,并考慮不同溫度、不同取代率對上述性能的影響規(guī)律。研究表明:高溫后真三軸壓強度和峰值應(yīng)變較常溫下單軸壓強度和峰值應(yīng)變有較大幅度提高,同一取代率條件下,隨著溫度的提高,真三軸壓強度降低,峰值應(yīng)變增大;同一溫度條件下,隨著取代率的提高,真三軸軸壓強度降低,峰值應(yīng)變增大。
[Abstract]:With the continuous rise of China's comprehensive national strength, a large number of construction waste is inevitably produced in the process of modernization. Recycled aggregate concrete (Recycled Aggregate Concrete) is a kind of technology to turn construction waste into treasure. The development of recycled concrete technology can effectively solve the contradiction between development and environmental protection, and has good environmental benefits, social benefits and economic benefits. Fire is one of the main disasters with the highest frequency and the most threat to public safety and social development. at high temperature, it has a great influence on the deformation performance, stress distribution and bearing capacity of concrete structures. Therefore, the mechanical properties of recycled concrete after high temperature under multi-axial compression stress are studied in this paper: (1) the biaxial compression test of recycled concrete with three substitution rates (0%, 50%, 100%) is carried out after high temperature treatment (200 鈩，

本文編號：2502579