The concrete mixer manufacturer said that the consequences of insufficient concrete strength are the reduction of concrete impermeability, durability, cracks and deformation of components, and the decline of bearing capacity. In serious cases, it will affect the normal use of buildings and even cause accidents. In view of the harm caused by insufficient concrete strength, it is very necessary to clarify the causes of insufficient concrete strength and what measures should be taken to control it. There are two common reasons for insufficient concrete strength:

水泥質(zhì)量不好是造成混凝土強(qiáng)度不足的關(guān)鍵因素。

The poor quality of cement is the key factor causing the insufficient strength of concrete.

石子質(zhì)量不好包括石子強(qiáng)度低、體積穩(wěn)定性差、石子形狀與表面轉(zhuǎn)態(tài)。在混凝土試塊試壓時(shí)，有時(shí)會(huì)發(fā)現(xiàn)石子被壓碎了，這說明石子強(qiáng)度低于混凝土的強(qiáng)度，導(dǎo)致混凝土實(shí)際強(qiáng)度下降。有些由于多孔燧石、頁(yè)巖、帶有膨脹粘土的石灰?guī)r等制成的碎石子，在干濕交替或凍融循環(huán)作用下，常表現(xiàn)為體積穩(wěn)定性差，而導(dǎo)致混凝土強(qiáng)度降低。針片狀石子含量高影響混凝土強(qiáng)度。石子表面光滑則無法與水泥砂漿結(jié)合好，也會(huì)影響混凝土強(qiáng)度。

Poor stone quality includes low stone strength, poor volume stability, stone shape and surface transformation. During the pressure test of concrete test block, it is sometimes found that the stone is crushed, which indicates that the strength of the stone is lower than that of the concrete, resulting in the decrease of the actual strength of the concrete. Some crushed stones made of porous chert, shale and limestone with expansive clay often show poor volume stability under the action of dry wet alternation or freeze-thaw cycle, resulting in the reduction of concrete strength. The high content of needle flake stones affects the strength of concrete. If the stone surface is smooth, it cannot be well combined with cement mortar, which will also affect the strength of concrete.

砂子配制混凝土用砂子的粗細(xì)程度按細(xì)度模數(shù)分為粗、中、細(xì)3個(gè)等級(jí)，配制混凝土宜優(yōu)先選用中砂。砂子質(zhì)量的好壞可用細(xì)度模數(shù)、含泥量、泥塊含量等幾項(xiàng)指標(biāo)來評(píng)定。其中含泥量、泥塊含量對(duì)混凝土強(qiáng)度影響。這是因?yàn)槟鄩K遇水會(huì)呈現(xiàn)漿狀，膠結(jié)在一顆或數(shù)顆砂子表面，在混凝土中與水泥起著隔離作用，從而影響了水泥與石子的粘結(jié)力。

The thickness of sand for concrete preparation is divided into three grades: coarse, medium and fine according to the fineness modulus. Medium sand should be preferred for concrete preparation. The quality of sand can be evaluated by fineness modulus, mud content, mud block content and other indicators. Among them, the mud content and mud block content have an impact on the concrete strength. This is because the mud block will appear slurry when encountering water, which is cemented on the surface of one or several sands and plays an isolation role with cement in the concrete, thus affecting the adhesion between cement and stone.

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