CN101486548B - 一种c50大体积混凝土 - Google Patents

一种c50大体积混凝土 Download PDF

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CN101486548B
CN101486548B CN2009100251672A CN200910025167A CN101486548B CN 101486548 B CN101486548 B CN 101486548B CN 2009100251672 A CN2009100251672 A CN 2009100251672A CN 200910025167 A CN200910025167 A CN 200910025167A CN 101486548 B CN101486548 B CN 101486548B
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concrete
mass concrete
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CN101486548A (zh
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宋功业
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JIANGSU DALISHEN PIPE CO., LTD.
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XUZHOU INSTITUTE OF ARCHITECTURAL TECHNOLOGY
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04Portland cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20Resistance against chemical, physical or biological attack
    • C04B2111/2038Resistance against physical degradation
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/34Non-shrinking or non-cracking materials
    • C04B2111/343Crack resistant materials
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

本发明公开了建筑施工企业采用的一种C50大体积混凝土,属混凝土领域。各原料的重量份为:水泥300份,碎石1100份,砂子620份,水180份,磨细矿渣200份,外加剂SPA7份。采用这一混凝土配合比,配合其它措施进行大体积混凝土施工,可以使大体积混凝土防裂效果更好。

Description

一种C50大体积混凝土
技术领域
本发明涉及建筑施工用的混凝土,具体是一种C50大体积混凝土。
背景技术
目前,大体积混凝土施工技术、特别是大体积混凝土配合比设计已经相当成熟,其主要技术是:基本采用低水泥用量以及低水化热水泥的模式来减少大体积混凝土的内外温差。这些对于低强度等级的混凝土(如强度等级为C20的混凝土)或要求混凝土的龄期为45天、60天或90天时,配合其它大体积混凝土施工的常规防裂措施非常有效。大体积混凝土配合比设计的思路是“低水化热——低内部应力——低早期强度”。即采用较少的低水化热水泥作为大体积混凝土的胶结料,使混凝土的早期内部应力低,同时混凝土的早期强度也很低(但必须高于当时的混凝土内部应力。这在20世纪后期是理想的大体积混凝土配合比设计方案,也是大体积混凝土施工防裂措施的核心技术。由于施工单位采用的大体积混凝土配合比都是来自试验室,现场施工技术人员往往只关注由于水泥水化反应产生的大体积混凝土的内外温差,而很少关注大体积混凝土的内部应力以及大体积混凝土的强度增长情况。
但是对于强度等级要求较高(如C40\C50及其更高强度等级的大体积混凝土)并且对施工工期要求较紧的大体积混凝土,采用现有的大体积混凝土配合比设计技术就很难保证混凝土不开裂。特别是进入本世纪以来,水泥的强度等级普遍提高,对于高强大体积混凝土施工来说,防裂的技术难度将更大。
工程实践证明,大体积混凝土的内外温差只是表面现象,导致大体积混凝土开裂的真正原因还是混凝土内部应力与当时的混凝土强度的关系。
发明内容
为解决上述问题,本发明提供一种C50大体积混凝土,本发明的主要原理是首先保证大体积混凝土的强度增长高于应力增长,随时随地使大体积混凝土的强度高于应力,同时对大体积混凝土的应变予以补偿,使大体积混凝土即使是在内外温差较大的情况下,也不会出现贯穿性裂纹。
本发明是以如下技术方案实现的:一种C50大体积混凝土,各原料的重量份为:
各原材料的重量份如下:
本发明的有益效果是:由于采用了高效外加剂SPA和加入了磨细矿渣作高掺掺合料,解决了混凝土的高强早强、减少水泥用量和混凝土施工过程中缓凝、坍落度损失较大等技术难题。且降低了混凝土成本。
具体实施方式
实施例1
各原料配合比:(每立方混凝土加入量)
水泥:采用42.5级的普通水泥,水泥用量为300kg;
碎石:粒径为5mm~32.5mm级配碎石,连续级配,含泥量以及泥团含量符合标准要求,用量1100kg;
砂子:中粗砂,含泥量以及泥团含量符合标准要求,用量620kg;
水:可饮用水,用量180kg;
磨细矿渣:用量200kg;
外加剂SPA,用量7kg。
磨细矿渣与外加剂必须符合国家现行标准的要求。
实验例1
使用实施例1配合比的C50大体积混凝土。
某设备基础8-18线长26米,A-F列宽27.6米,厚度5.4米,平面接近长方形,底面积717.6平方米,±0.000绝对标高相当于484.8,承台下为桩基,基础顶部标高+2.400,底部标高-3.000,自然地面标高为-0.500左右。砼强度采用后期强度fck(60d)≥33.2N/m2(要求大体积混凝土60d的后期强度行当与C50),砼浇筑量为2500m3,,混凝土一次浇注量为2500m3,由于工期短,只能采用28天强度,冬期施工。
本工程配合其它施工技术措施,确保了大体积混凝土设备基础的施工。
本次配合比设计采用磨细矿渣代替水泥,不但确保了工程质量,也使工程成本大大降低。具体成本的降低幅度,与采用的水泥的价格以及磨细矿渣价格有关。

Claims (1)

1.一种C50大体积混凝土,其特征在于,各原材料的重量份如下:
Figure FFW00000053532800011
所述的水泥为42.5级普通硅酸盐水泥;碎石粒径为5mm~32.5mm级配碎石;砂子为中粗砂;水为可饮用水;磨细矿渣与外加剂必须符合国家现行标准的要求。
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CN106747046A (zh) * 2016-11-17 2017-05-31 攀钢集团工程技术有限公司 一种全矿渣混凝土及其不同部位的不同浇注方法
CN111470812B (zh) * 2020-06-02 2022-02-15 陕西秦汉恒盛新型建材科技股份有限公司 用于深基坑小倾角溜管施工的c50p10大体积混凝土
CN114014611A (zh) * 2021-11-26 2022-02-08 上海核工程研究设计院有限公司 一种适用于核电大体积筏基底板浇筑的混凝土制备技术

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1498872A (zh) * 2002-11-08 2004-05-26 上海浦莲预拌混凝土公司 环保型高性能预拌混凝土及其制备方法
CN1166580C (zh) * 2001-12-07 2004-09-15 北京市城昌商品混凝土联营公司 纤维抗渗防裂混凝土
CN1291110C (zh) * 2004-04-12 2006-12-20 中国第二十冶金建设公司 掺磨细矿渣微粉的混凝土管桩及其生产方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1166580C (zh) * 2001-12-07 2004-09-15 北京市城昌商品混凝土联营公司 纤维抗渗防裂混凝土
CN1498872A (zh) * 2002-11-08 2004-05-26 上海浦莲预拌混凝土公司 环保型高性能预拌混凝土及其制备方法
CN1291110C (zh) * 2004-04-12 2006-12-20 中国第二十冶金建设公司 掺磨细矿渣微粉的混凝土管桩及其生产方法

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