2018NO.4
试验与应用
粉煤灰综合利用
FLY ASH COMPREHENSIVE UTILIZATION
养护条件对粉煤灰混凝土力学性能的影响
Effect of Curing Conditions onMechanicalProperties ofFly AshConcrete
邱常怀
（陕西建工第一建设集团有限公司，陕西西安710000）
摘要：不同类型的混凝土对养护环境的敏感性也不同，为研究不同养护条件对粉煤灰混凝土力学性能的影响，以标准C30混凝土配合比为基准，通过使用粉煤灰替换10%的水泥量配比得到粉煤灰混凝土试件，对高温、低温、标准以及水中4种养护条件下粉煤灰混凝土的抗压强度、抗拉强度、抗折强度以及渗透性展开研究，试验结果表明：（1）当用粉煤灰替换水泥时，粉煤灰混凝土的早期强度相对较低，但随着养护时间的增长，粉煤灰对固有水泥的激发作用将逐渐显现，使得粉煤灰混凝土的后期强度会逐渐赶上普通混凝土。（2）高温养护条件时，粉煤灰混凝土的早期强度增长最快，而后期强度却相对较低；低温养护条件下粉煤灰混凝土的强度要比同期时其他养护条件小得多：水中养护条件下粉煤灰混凝土的强度最高。（3粉煤灰混凝土后期的抗拉强度和抗折强度在水中养护条件下均最高，在标准养护条件下次之低温养护条件下最小，只达到标准养护条件的58%和66%。
关键词：粉煤灰混凝土；养护条件；抗压强度；抗折强度；渗透性
中图分类号：TU375
文献标识码：A
文章编号：10058249（2018）04005404 QiuChanghuai
(Shanxi Construction First Construetion Group Co., Lad.,Xi'an 710000, China)
Abstract: Different types of concrete have different sensitivities to the conservation environment. To study the influence of different euring conditions on the mechanical properties of fly ash concrete, this paper uses the standard C30 concrete mix ratio as a benchmark, and uses fly ash to replace 10 % of the cement ratio to obtain a fly ash concrete test piece, The compressive strength, tensile strength, flexural strength, and permeability of fly ash concrete under high temperature, low temperature,standard, and water curing conditions were studied. The following major results have been obtained: (1) When cement is replaced with fly ash, the early strength of fly ash concrete is relatively low, but as the curing time increases, the excitation effect of fly ash on the inherent cement willgradually appear and the later strength of fly ash concrete will gradually catch up with ordinary concrete, (2) Under high temperature curing conditions, the early strength of fly ash concrete increases fastest, but the strength at late stage is relatively low, Under low temperature curing conditions, the strength of fly ash concrete is much lower than that of other curing conditions in the same period. And the strength of fly ash concrete is highest under the water conservation conditions, (3) In the later stage the tensile strength and flexural strength of fly ash concrete are highest under water curing conditions, and are lowest under low temperature euring conditions, which reaching only 58 % and 66 % of the standard euring conditions.
Keywords: fly ash concrete; curing conditions; compressive strength; flexural strength; permeability
随着人类社会科学以及工业技术的不断进步，国家对生产生活上的节能减排、环境保护越来越重视。混凝土作为建筑工程中必不可少的一项建筑材料，如何满足国家节能减排的要求和降低生产成本
作者简介：邱常怀（1971年～），男，本科，子公司经理，主要从事建筑工程管理。E-mail:2799629357@qq.com
收稿日期：2018-03-16· 54·
万方数据
也成为了当务之急(1-2]。建设研究学者经过研究发现，在混凝土中掺人粉煤灰，可以使混凝土具备水化热低、改善和易性、提高耐久性等优点（3-6），同时还能对废料粉煤灰加以利用。因此，目前粉煤灰混凝土在建材行业得到了大量的推广使用。
众所周知，实际工程中粉煤灰混凝土所处的环境条件通常是十分复杂的，不同的环境条件就会使