本文選題：廢磚渣 + 內(nèi)養(yǎng)護(hù)��； 參考：《廣東工業(yè)大學(xué)》2017年碩士論文

【摘要】：由于水膠比較低且添加了硅灰等超細(xì)礦物摻合料,高性能混凝土的內(nèi)部相對濕度在水泥水化反應(yīng)早期下降較快,容易發(fā)生自干燥,導(dǎo)致混凝土收縮,引起開裂。傳統(tǒng)的外部養(yǎng)護(hù)方法并不能完全解決混凝土的干燥收縮開裂問題,而摻入預(yù)濕處理的內(nèi)養(yǎng)護(hù)材料可以有效從內(nèi)部緩解混凝土的自干燥,降低自收縮�；陲査p集料內(nèi)養(yǎng)護(hù)技術(shù)原理,發(fā)現(xiàn)廢棄粘土磚有作為內(nèi)養(yǎng)護(hù)材料的潛質(zhì),同時也能為廢棄粘土磚的再利用提供新的方法。本文測定并分析了廢磚渣的基本物理性能,以廢磚渣取代部分細(xì)骨料研究了摻廢磚渣對混凝土的工作性能、收縮開裂性能、力學(xué)性能和耐久性能的影響,同時研究了復(fù)摻廢磚渣與超吸水樹脂(SAP)對混凝土內(nèi)養(yǎng)護(hù)效果的影響,為廢磚渣用作內(nèi)養(yǎng)護(hù)材料提供一定的科學(xué)依據(jù)。本文主要研究成果如下:(1)綜合對廢磚渣的基本物理性能、微觀結(jié)構(gòu)、吸水率的分析,得出廢磚渣具備作為內(nèi)養(yǎng)護(hù)材料潛質(zhì)的結(jié)論。研究了廢磚渣取代部分細(xì)骨料對混凝土基本性能的影響。結(jié)果表明飽水后的廢磚渣摻入到混凝土中后增大了混凝土的流動性。隨著廢磚渣摻量的提高,水泥砂漿的自收縮和干燥收縮率逐漸降低,抗裂性能也提高。(2)研究了廢磚渣對混凝土抗壓強(qiáng)度的影響。當(dāng)廢磚渣摻入比例不大于30%時,混凝土后期強(qiáng)度基本與基準(zhǔn)混凝土相同;廢磚渣摻入比例為20%時,其90d強(qiáng)度超過了基準(zhǔn)混凝土。另外,廢磚渣的內(nèi)養(yǎng)護(hù)作用對低水膠比混凝土的后期強(qiáng)度提高更加明顯,能有效促進(jìn)硅灰火山灰效應(yīng)的發(fā)揮。隨著廢磚渣粒徑的減小,混凝土強(qiáng)度逐漸降低,且單一粒徑的廢磚渣混凝土強(qiáng)度都低于混合粒徑的廢磚渣混凝土強(qiáng)度。復(fù)摻SAP和廢磚渣能改善SAP對強(qiáng)度的不利影響。(3)研究了廢磚渣對混凝土抗碳化性能的影響。當(dāng)廢磚渣摻量不超過30%時,基本不影響混凝土的抗碳化能力。廢磚渣對低水膠比的混凝土抗碳化性能影響更加顯著,但對不同摻量硅灰混凝土影響較為一致,會使碳化深度增大3倍左右。混合粒徑廢磚渣混凝土的碳化深度均大于單一粒徑廢磚渣混凝土的碳化深度。復(fù)摻SAP和廢磚渣能改善SAP對抗碳化性能的不利影響。(4)當(dāng)廢磚渣摻量為10%時,電通量比基準(zhǔn)混凝土降低25.3%;超過10%后,隨著摻量的增加,混凝土電通量逐漸增大。水膠比越高,廢磚渣對混凝土的電通量影響越小。摻入廢磚渣后,硅灰比例越大,廢磚渣對混凝土電通量的影響越不明顯。另外,廢磚渣的粒徑大小對混凝土電通量影響差別不大,但混合粒徑的廢磚渣混凝土電通量要大于單一粒徑時的情況。同時,復(fù)摻SAP和廢磚渣后的混凝土電通量相比單摻SAP的混凝土反而有所增大。綜上述,廢磚渣在不明顯影響混凝土的強(qiáng)度和耐久性前提下,可以有效減小混凝土的早期收縮,改善抗裂性能。廢棄粘土磚用作混凝土內(nèi)養(yǎng)護(hù)材料是可行的。
[Abstract]:Because of the low water glue and the addition of ultrafine mineral admixtures such as silica fume, the internal relative humidity of high performance concrete decreases rapidly in the early stage of hydration reaction of cement, and self-drying easily occurs, which leads to shrinkage and cracking of high performance concrete. The traditional external curing method can not completely solve the problem of drying shrinkage cracking of concrete, but the internal curing material mixed with pre-wet treatment can effectively alleviate the self-drying and reduce the self-shrinkage of concrete from the inside. Based on the principle of internal curing technology of saturated lightweight aggregate, it is found that abandoned clay brick has the potential as internal curing material, and it can also provide a new method for reuse of waste clay brick. In this paper, the basic physical properties of waste brick slag are measured and analyzed. The effects of waste brick slag on the working performance, shrinkage cracking property, mechanical property and durability of concrete are studied by replacing some fine aggregates with waste brick slag. At the same time, the influence of waste brick slag and superabsorbent resin (SAP) on the curing effect of concrete is studied, which provides a scientific basis for waste brick slag to be used as internal curing material. The main research results of this paper are as follows: (1) the basic physical properties, microstructure and water absorption of waste brick slag are analyzed, and the conclusion that waste brick slag has potential as internal curing material is concluded. The effect of waste brick slag replacing some fine aggregate on the basic properties of concrete was studied. The results show that the fluidity of concrete is increased by adding waste brick slag into concrete. With the increase of waste brick slag content, the self-shrinkage and drying shrinkage of cement mortar decreased gradually, and the crack resistance of cement mortar was improved. (2) the influence of waste brick slag on the compressive strength of concrete was studied. When the ratio of waste brick and slag is less than 30, the later strength of concrete is basically the same as that of standard concrete, and when the proportion of waste brick and slag is 20, its strength of 90 days is higher than that of standard concrete. In addition, the internal curing effect of waste brick slag is more obvious to the later strength of low water cement than concrete, and it can effectively promote the exertion of the ash effect of silica ash. With the decrease of the particle size of the waste brick slag, the strength of the concrete decreases gradually, and the strength of the concrete with a single particle size is lower than that of the waste brick slag concrete with mixed particle size. The influence of adding SAP and waste brick slag on the strength of concrete was studied. When the amount of waste brick slag is less than 30, the carbonation resistance of concrete is not affected. The effect of waste brick slag on the carbonation resistance of concrete with low water-binder ratio is more significant, but the effect on the concrete with different content of silica fume is more consistent, which will increase the carbonation depth by about 3 times. The carbonation depth of mixed size waste brick slag concrete is higher than that of single size waste brick slag concrete. The addition of SAP and waste brick slag can improve the adverse effect of SAP on the carbonization performance of SAP.) when the content of waste brick slag is 10%, the electric flux of concrete decreases by 25. 3% compared with the standard concrete, and after more than 10%, the electric flux of concrete increases gradually with the increase of the content of waste brick slag. The higher the water-binder ratio, the smaller the influence of waste brick slag on the electric flux of concrete. With the addition of waste brick slag, the larger the ratio of silica fume is, the less the influence of waste brick slag on the electric flux of concrete is. In addition, the particle size of the waste brick slag has little effect on the electric flux of concrete, but the electric flux of the waste brick slag concrete with mixed particle size is larger than that of the concrete with a single particle size. At the same time, the electric flux of concrete mixed with SAP and waste brick slag is larger than that of concrete mixed with SAP alone. Under the premise of not obviously affecting the strength and durability of concrete, the waste brick slag can effectively reduce the early shrinkage of concrete and improve its crack resistance. It is feasible to use waste clay brick as curing material in concrete.
【學(xué)位授予單位】：廣東工業(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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本文編號：1999776