【摘要】：再生細(xì)骨料混凝土是一種新型綠色建筑材料,具有環(huán)保和經(jīng)濟(jì)價值。作為一種新材料,再生細(xì)骨料混凝土基本性能的優(yōu)劣直接關(guān)系到混凝土結(jié)構(gòu)的安全。對再生細(xì)骨料混凝土基本性能進(jìn)行試驗(yàn)研究具有實(shí)用價值。針對實(shí)際生產(chǎn)中使用的再生細(xì)骨料,本文采用基于自由水灰比的配合比設(shè)計方法成功配制了再生細(xì)骨料混凝土,并按5種水灰比,6種再生細(xì)骨料取代率分別進(jìn)行再生細(xì)骨料混凝土工作性能、力學(xué)性能和耐久性能試驗(yàn),探討了工程應(yīng)用的可行性,取得的主要成果如下:1、著重分析了再生細(xì)骨料與天然砂的性能差異,并總結(jié)出再生細(xì)骨料的性能特點(diǎn)。試驗(yàn)結(jié)果顯示,再生細(xì)骨料物理性能指標(biāo)幾乎只能達(dá)到規(guī)范Ⅲ類的要求,整體品質(zhì)較差,性能不及天然砂。2、再生細(xì)骨料混凝土采用基于自由水灰比的配合比設(shè)計方法,把混凝土拌合用水分成自由水和吸附水兩部分,解決了再生細(xì)骨料吸水率大對其坍落度構(gòu)成不良影響這一難題,試驗(yàn)所配的再生細(xì)骨料混凝土的工作性能基本能滿足要求。應(yīng)用此方法配制再生細(xì)骨料混凝土,其工作性能滿足工程使用要求。3、對不同水灰比而言,隨著取代率不斷增加,再生細(xì)骨料混凝土抗壓強(qiáng)度、抗拉強(qiáng)度、抗折強(qiáng)度都有不同程度地降低。當(dāng)取代率不大于20%時,水灰比0.7的再生細(xì)骨料混凝土的抗壓強(qiáng)度、抗拉強(qiáng)度、抗折強(qiáng)度均不低于普通混凝土,說明該情況下混凝土中天然砂可由再生細(xì)骨料進(jìn)行取代,但取代率不應(yīng)超過20%。4、當(dāng)取代率不大于20%時,再生細(xì)骨料混凝土的抗?jié)B性能達(dá)到P6等級,其氯離子滲透性低,且其抗碳化性能較好,說明再生細(xì)骨料混凝土的耐久性符合工程一般要求。
[Abstract]:Recycled fine aggregate concrete is a new green building material with environmental protection and economic value. As a new material, the basic performance of recycled fine aggregate concrete is directly related to the safety of concrete structure. It is of practical value to study the basic properties of recycled fine aggregate concrete. Aiming at the recycled fine aggregate used in actual production, this paper has successfully prepared the recycled fine aggregate concrete by using the mix ratio design method based on free water cement ratio. At the same time, according to the replacement ratio of 5 kinds of water-cement ratio and 6 kinds of recycled fine aggregate, the working performance, mechanical property and durability of recycled fine aggregate concrete were tested, and the feasibility of engineering application was discussed. The main results are as follows: 1. The difference between recycled fine aggregate and natural sand is analyzed, and the characteristics of recycled fine aggregate are summarized. The test results show that the physical properties of recycled fine aggregate can almost meet the requirements of Class III of the Code, the overall quality is poor, and the performance is not as good as that of natural sand. The recycled fine aggregate concrete adopts the design method of mix ratio based on free water-cement ratio. The concrete mixing water is divided into two parts: free water and adsorbent water, which solves the problem that the high water absorption rate of recycled fine aggregate has a bad effect on its slump. The working performance of recycled fine aggregate concrete can basically meet the requirements. Using this method to prepare recycled fine aggregate concrete, its working performance meets the requirement of engineering application. For different water-cement ratio, with the increasing of replacement rate, the compressive strength and tensile strength of recycled fine aggregate concrete are obtained. The flexural strength is reduced to some extent. When the replacement ratio is less than 20, the compressive strength, tensile strength and flexural strength of recycled fine aggregate concrete with water-cement ratio 0.7 are not lower than that of ordinary concrete, which shows that the natural sand in concrete can be replaced by recycled fine aggregate in this case. But the substitution rate should not exceed 20. 4. When the substitution rate is not greater than 20, the impermeability of recycled fine aggregate concrete reaches P6 grade, its chloride ion permeability is low, and its carbonation resistance is better. The durability of recycled fine aggregate concrete meets the general engineering requirements.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU528

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