本文選題：混凝土 + 碳化��； 參考：《內(nèi)蒙古工業(yè)大學(xué)》2013年碩士論文

【摘要】：近年來,礦物摻合料混凝土被廣泛應(yīng)用于工業(yè)與民用建筑中。在混凝土中摻入粉煤灰和礦粉,首先,能解決工業(yè)廢料堆積對(duì)環(huán)境的污染問題。其次,礦物摻合料摻入混凝土中可以改善混凝土的工作性能、力學(xué)性能和提高混凝土的耐久性。最后,粉煤灰和礦粉摻入混凝土能減少水泥用量,降低混凝土成本。但是,近年來國(guó)內(nèi)研究表明,因粉煤灰和礦粉地域的差異,造成其化學(xué)成分不同,粉煤灰和礦粉對(duì)混凝土的碳化性能影響也不盡相同。本次試驗(yàn)是結(jié)合前人研究理論的基礎(chǔ)上,主要結(jié)合本地原材料,研究粉煤灰混凝土和礦粉混凝土的工作性能、力學(xué)性能和抗碳化性能。 本次碳化試驗(yàn)所采用的是快速碳化方法,研究粉煤灰和礦粉對(duì)混凝土工作性能、力學(xué)性能及抗碳化性能的影響。 試驗(yàn)是在C30、C40、C50混凝土中分別單摻粉煤灰和礦粉,摻量為0%,10%,20%,30%,40%。C30混凝土復(fù)摻粉煤灰和礦粉,摻10%粉煤灰和分別摻入10%,20%,30%礦粉；摻10%礦粉和分別摻入10%,20%,30%的粉煤灰。試驗(yàn)表明： (1)粉煤灰、礦粉的加入改善了混凝土的工作性能。粉煤灰的摻量小于30%時(shí)坍落度增大,當(dāng)粉煤灰摻量增加到40%時(shí),坍落度減小,說明粉煤灰摻量過大對(duì)混凝土工作性能無益；礦粉的摻入改善混凝土工作性能,但是,當(dāng)與粉煤灰摻量相同時(shí),工作性能比粉煤灰混凝土要差。 (2)由于粉煤灰和礦粉的活性不同,對(duì)混凝土的抗壓強(qiáng)度影響不同。摻入粉煤灰及礦粉的早期強(qiáng)度(7d)與基準(zhǔn)相比稍低。隨著養(yǎng)護(hù)齡期的增長(zhǎng),摻入粉煤灰和礦粉的混凝土抗壓強(qiáng)度均高于基準(zhǔn)混凝土強(qiáng)度,中后期28d、60d混凝土強(qiáng)度都達(dá)到設(shè)計(jì)強(qiáng)度且均高于基準(zhǔn)混凝土。粉煤灰摻量在40%時(shí),強(qiáng)度比基準(zhǔn)混凝土抗壓強(qiáng)度高,但與摻量小于30%的相比較低,說明粉煤灰的摻量應(yīng)控制在30%以內(nèi)。 (3)不同強(qiáng)度等級(jí)的混凝土,碳化深度也是不同的。隨著強(qiáng)度等級(jí)的提高,混凝土的抗碳化能力增強(qiáng)。 (4)粉煤灰混凝土碳化深度與粉煤灰的摻量成正比；礦粉混凝土與粉煤灰混凝土相比,礦粉混凝土抗碳化性能優(yōu)于粉煤灰混凝土。 (5)通過經(jīng)濟(jì)分析得出,礦粉摻量30%時(shí),C30、C40、C50混凝土的工作性能較好、抗壓強(qiáng)度高、碳化深度淺,所以說,礦粉摻量在30%時(shí)礦粉混凝土經(jīng)濟(jì)性最高。
[Abstract]:In recent years , mineral admixture concrete has been widely used in industrial and civil buildings . Fly ash and mineral powder are mixed in concrete . First , it can solve the environmental pollution problem of industrial waste accumulation . In addition , the mineral admixture can improve the workability , mechanical property and durability of concrete .

The effect of fly ash and mineral powder on the workability , mechanical properties and carbonation resistance of concrete was studied by means of rapid carbonation .

The experimental results show that fly ash and ore powder are separately added into C30 , C40 and 50 C concrete respectively , the content is 0 % , 10 % , 20 % , 30 % , 40 % . C30 concrete is mixed with fly ash and ore powder , 10 % fly ash is added and 10 % , 20 % and 30 % mineral powder are added respectively ;
10 % of mineral powder and 10 % , 20 % and 30 % fly ash are added respectively . The test shows that :

( 1 ) The addition of fly ash and mineral powder improves the working performance of the concrete . When the content of fly ash is less than 30 % , the slump is increased . When the content of fly ash increases to 40 % , the slump decreases , indicating that the content of fly ash is too large to be beneficial to the working performance of the concrete ;
The incorporation of mineral powder improves the workability of the concrete , however , when the content of fly ash is the same , the working performance is worse than that of the fly ash concrete .

( 2 ) Due to the different activity of fly ash and mineral powder , the compressive strength of concrete is different . The compressive strength of concrete mixed with fly ash and mineral powder is slightly lower than that of reference concrete . With the increase of curing age , the compressive strength of concrete mixed with fly ash and mineral powder is higher than that of reference concrete . When the content of fly ash is 40 % , the strength is higher than that of reference concrete , but it is lower than that of reference concrete when the content of fly ash is less than 30 % , so that the content of fly ash should be controlled within 30 % .

( 3 ) The carbonation depth of the concrete with different strength grades is different . As the strength grade increases , the carbonation resistance of the concrete is enhanced .

( 4 ) the carbonation depth of fly ash concrete is proportional to the amount of fly ash ;
Compared with fly ash concrete , the anti - carbonization property of mineral powder concrete is better than that of fly ash concrete .

( 5 ) According to the economic analysis , when the content of mineral powder is 30 % , the working performance of C30 , C40 and 50 C concrete is good , the compressive strength is high , the carbonization depth is shallow , so that the mineral powder concrete has the highest economic efficiency when the content of mineral powder is 30 % .
【學(xué)位授予單位】：內(nèi)蒙古工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU528

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本文編號(hào)：2029331