A kind of explosion-proof cracking cement and preparation method thereof

Abstract

The invention provides anti-burst cement and belongs to the field of building materials. The anti-burst cement is prepared from, by weight, 40-60% of clinkers, 0.5-5% of phosphogypsum, 1-5% of titanium gypsum, 20-40% of water granulated slag, 2-15% of limestone, 2-10% of black ash, 1-3% of active silicon, 0.1-0.5% of lignin fiber, 0.1-0.5% of polypropylene fibers, 0.3-1% of glass fibers, 0.3-1% ofa water reducing agent, 0.5-2% of sodium polyacrylate, and 0.5-2% of lauryl sodium sulfate. The anti-burst cement is prepared from the water granulated slag, limestone, phosphogypsum, titanium gypsumand black ash as main materials with addition of the active silicon, lignin fiber, polypropylene fibers and glass fibers, so that hydration heat is synergistically reduced, and cracks due to internaltemperature increase in large-size concrete are prevented. In addition, water requirement and shrinking rate are reduced and strength and stability of the cement are improved.

Description

technical field [0001] The invention relates to the field of building materials, in particular to an explosion-proof cracking cement and a preparation method thereof. Background technique [0002] Cement is an important raw material for the preparation of concrete and various cement products, and is also an indispensable building material for civil engineering. Although ordinary cement has high compressive strength in hardened cement concrete, it also has many defects, such as low tensile strength, poor impact resistance, and poor crack resistance. In some low-strength bases, the traditional method is to apply a waterproof coating layer on the surface of the cement layer after the cement concrete is cured. The surface of the waterproof layer is smooth, and there is a great safety hazard when workers work at heights. Therefore, crack-resistant cement-based waterproof coatings have appeared, which are modified by dispersible rubber powder and modifiers. After curing, the cem...

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Problems solved by technology

At the same time, the existence of cracks leads to the failure of waterproofing, which makes the cement matrix deteriorate until it is destroyed. Therefore, the cracking of the cement matrix is ​​also a technical problem that needs to be solved urgently in construction engineering.

[0004] Although traditional Portland cement has high compressive strength, it has defects such as fast hydration speed, high heat of hydration, low tensile strength, large shrinkage, poor crack resistance and high brittleness, which directly affect use of cement

At the same time, due to the high heat of hydration, large water demand, and large plastic shrinkage, cement is prone to cracks in the early stage of use, and the cracks will increase with time, seriously affecting the performance and durability of cement.

Adding admixtures such as slag or fly ash to reduce the heat of hydration and achieve low shrinkage to resist thermal cracking, but it cannot improve its brittleness, and there are generally problems such as large water demand, easy water absorption, and low early strength.

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